http://git-wip-us.apache.org/repos/asf/hbase-site/blob/d171b896/devapidocs/src-html/org/apache/hadoop/hbase/coprocessor/RegionObserver.html ---------------------------------------------------------------------- diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/coprocessor/RegionObserver.html b/devapidocs/src-html/org/apache/hadoop/hbase/coprocessor/RegionObserver.html index 4c37cbe..cfb8ee4 100644 --- a/devapidocs/src-html/org/apache/hadoop/hbase/coprocessor/RegionObserver.html +++ b/devapidocs/src-html/org/apache/hadoop/hbase/coprocessor/RegionObserver.html @@ -228,837 +228,853 @@ <span class="sourceLineNo">220</span> * of candidates. If you remove all the candidates then the compaction will be canceled.<a name="line.220"></a> <span class="sourceLineNo">221</span> * <p>Supports Coprocessor 'bypass' -- 'bypass' is how this method indicates that it changed<a name="line.221"></a> <span class="sourceLineNo">222</span> * the passed in <code>candidates</code>.<a name="line.222"></a> -<span class="sourceLineNo">223</span> * @param c the environment provided by the region server<a name="line.223"></a> -<span class="sourceLineNo">224</span> * @param store the store where compaction is being requested<a name="line.224"></a> -<span class="sourceLineNo">225</span> * @param candidates the store files currently available for compaction<a name="line.225"></a> -<span class="sourceLineNo">226</span> * @param tracker tracker used to track the life cycle of a compaction<a name="line.226"></a> -<span class="sourceLineNo">227</span> */<a name="line.227"></a> -<span class="sourceLineNo">228</span> default void preCompactSelection(ObserverContext<RegionCoprocessorEnvironment> c, Store store,<a name="line.228"></a> -<span class="sourceLineNo">229</span> List<? extends StoreFile> candidates, CompactionLifeCycleTracker tracker)<a name="line.229"></a> -<span class="sourceLineNo">230</span> throws IOException {}<a name="line.230"></a> -<span class="sourceLineNo">231</span><a name="line.231"></a> -<span class="sourceLineNo">232</span> /**<a name="line.232"></a> -<span class="sourceLineNo">233</span> * Called after the {@link StoreFile}s to compact have been selected from the available<a name="line.233"></a> -<span class="sourceLineNo">234</span> * candidates.<a name="line.234"></a> -<span class="sourceLineNo">235</span> * @param c the environment provided by the region server<a name="line.235"></a> -<span class="sourceLineNo">236</span> * @param store the store being compacted<a name="line.236"></a> -<span class="sourceLineNo">237</span> * @param selected the store files selected to compact<a name="line.237"></a> -<span class="sourceLineNo">238</span> * @param tracker tracker used to track the life cycle of a compaction<a name="line.238"></a> -<span class="sourceLineNo">239</span> * @param request the requested compaction<a name="line.239"></a> -<span class="sourceLineNo">240</span> */<a name="line.240"></a> -<span class="sourceLineNo">241</span> default void postCompactSelection(ObserverContext<RegionCoprocessorEnvironment> c, Store store,<a name="line.241"></a> -<span class="sourceLineNo">242</span> List<? extends StoreFile> selected, CompactionLifeCycleTracker tracker,<a name="line.242"></a> -<span class="sourceLineNo">243</span> CompactionRequest request) {}<a name="line.243"></a> -<span class="sourceLineNo">244</span><a name="line.244"></a> -<span class="sourceLineNo">245</span> /**<a name="line.245"></a> -<span class="sourceLineNo">246</span> * Called before we open store scanner for compaction. You can use the {@code options} to change max<a name="line.246"></a> -<span class="sourceLineNo">247</span> * versions and TTL for the scanner being opened.<a name="line.247"></a> -<span class="sourceLineNo">248</span> * @param c the environment provided by the region server<a name="line.248"></a> -<span class="sourceLineNo">249</span> * @param store the store being compacted<a name="line.249"></a> -<span class="sourceLineNo">250</span> * @param scanType type of Scan<a name="line.250"></a> -<span class="sourceLineNo">251</span> * @param options used to change max versions and TTL for the scanner being opened<a name="line.251"></a> -<span class="sourceLineNo">252</span> * @param tracker tracker used to track the life cycle of a compaction<a name="line.252"></a> -<span class="sourceLineNo">253</span> * @param request the requested compaction<a name="line.253"></a> -<span class="sourceLineNo">254</span> */<a name="line.254"></a> -<span class="sourceLineNo">255</span> default void preCompactScannerOpen(ObserverContext<RegionCoprocessorEnvironment> c, Store store,<a name="line.255"></a> -<span class="sourceLineNo">256</span> ScanType scanType, ScanOptions options, CompactionLifeCycleTracker tracker,<a name="line.256"></a> -<span class="sourceLineNo">257</span> CompactionRequest request) throws IOException {}<a name="line.257"></a> -<span class="sourceLineNo">258</span><a name="line.258"></a> -<span class="sourceLineNo">259</span> /**<a name="line.259"></a> -<span class="sourceLineNo">260</span> * Called prior to writing the {@link StoreFile}s selected for compaction into a new<a name="line.260"></a> -<span class="sourceLineNo">261</span> * {@code StoreFile}.<a name="line.261"></a> -<span class="sourceLineNo">262</span> * <p><a name="line.262"></a> -<span class="sourceLineNo">263</span> * To override or modify the compaction process, implementing classes can wrap the provided<a name="line.263"></a> -<span class="sourceLineNo">264</span> * {@link InternalScanner} with a custom implementation that is returned from this method. The<a name="line.264"></a> -<span class="sourceLineNo">265</span> * custom scanner can then inspect {@link org.apache.hadoop.hbase.Cell}s from the wrapped scanner,<a name="line.265"></a> -<span class="sourceLineNo">266</span> * applying its own policy to what gets written.<a name="line.266"></a> -<span class="sourceLineNo">267</span> * @param c the environment provided by the region server<a name="line.267"></a> -<span class="sourceLineNo">268</span> * @param store the store being compacted<a name="line.268"></a> -<span class="sourceLineNo">269</span> * @param scanner the scanner over existing data used in the store file rewriting<a name="line.269"></a> -<span class="sourceLineNo">270</span> * @param scanType type of Scan<a name="line.270"></a> -<span class="sourceLineNo">271</span> * @param tracker tracker used to track the life cycle of a compaction<a name="line.271"></a> -<span class="sourceLineNo">272</span> * @param request the requested compaction<a name="line.272"></a> -<span class="sourceLineNo">273</span> * @return the scanner to use during compaction. Should not be {@code null} unless the<a name="line.273"></a> -<span class="sourceLineNo">274</span> * implementation is writing new store files on its own.<a name="line.274"></a> -<span class="sourceLineNo">275</span> */<a name="line.275"></a> -<span class="sourceLineNo">276</span> default InternalScanner preCompact(ObserverContext<RegionCoprocessorEnvironment> c, Store store,<a name="line.276"></a> -<span class="sourceLineNo">277</span> InternalScanner scanner, ScanType scanType, CompactionLifeCycleTracker tracker,<a name="line.277"></a> -<span class="sourceLineNo">278</span> CompactionRequest request) throws IOException {<a name="line.278"></a> -<span class="sourceLineNo">279</span> return scanner;<a name="line.279"></a> -<span class="sourceLineNo">280</span> }<a name="line.280"></a> -<span class="sourceLineNo">281</span><a name="line.281"></a> -<span class="sourceLineNo">282</span> /**<a name="line.282"></a> -<span class="sourceLineNo">283</span> * Called after compaction has completed and the new store file has been moved in to place.<a name="line.283"></a> -<span class="sourceLineNo">284</span> * @param c the environment provided by the region server<a name="line.284"></a> -<span class="sourceLineNo">285</span> * @param store the store being compacted<a name="line.285"></a> -<span class="sourceLineNo">286</span> * @param resultFile the new store file written out during compaction<a name="line.286"></a> -<span class="sourceLineNo">287</span> * @param tracker used to track the life cycle of a compaction<a name="line.287"></a> -<span class="sourceLineNo">288</span> * @param request the requested compaction<a name="line.288"></a> -<span class="sourceLineNo">289</span> */<a name="line.289"></a> -<span class="sourceLineNo">290</span> default void postCompact(ObserverContext<RegionCoprocessorEnvironment> c, Store store,<a name="line.290"></a> -<span class="sourceLineNo">291</span> StoreFile resultFile, CompactionLifeCycleTracker tracker, CompactionRequest request)<a name="line.291"></a> -<span class="sourceLineNo">292</span> throws IOException {}<a name="line.292"></a> -<span class="sourceLineNo">293</span><a name="line.293"></a> -<span class="sourceLineNo">294</span> /**<a name="line.294"></a> -<span class="sourceLineNo">295</span> * Called before the region is reported as closed to the master.<a name="line.295"></a> -<span class="sourceLineNo">296</span> * @param c the environment provided by the region server<a name="line.296"></a> -<span class="sourceLineNo">297</span> * @param abortRequested true if the region server is aborting<a name="line.297"></a> -<span class="sourceLineNo">298</span> */<a name="line.298"></a> -<span class="sourceLineNo">299</span> default void preClose(ObserverContext<RegionCoprocessorEnvironment> c, boolean abortRequested)<a name="line.299"></a> -<span class="sourceLineNo">300</span> throws IOException {}<a name="line.300"></a> -<span class="sourceLineNo">301</span><a name="line.301"></a> -<span class="sourceLineNo">302</span> /**<a name="line.302"></a> -<span class="sourceLineNo">303</span> * Called after the region is reported as closed to the master.<a name="line.303"></a> -<span class="sourceLineNo">304</span> * @param c the environment provided by the region server<a name="line.304"></a> -<span class="sourceLineNo">305</span> * @param abortRequested true if the region server is aborting<a name="line.305"></a> -<span class="sourceLineNo">306</span> */<a name="line.306"></a> -<span class="sourceLineNo">307</span> default void postClose(ObserverContext<RegionCoprocessorEnvironment> c, boolean abortRequested) {}<a name="line.307"></a> -<span class="sourceLineNo">308</span><a name="line.308"></a> -<span class="sourceLineNo">309</span> /**<a name="line.309"></a> -<span class="sourceLineNo">310</span> * Called before the client performs a Get<a name="line.310"></a> -<span class="sourceLineNo">311</span> * <p><a name="line.311"></a> -<span class="sourceLineNo">312</span> * Call CoprocessorEnvironment#bypass to skip default actions<a name="line.312"></a> -<span class="sourceLineNo">313</span> * @param c the environment provided by the region server<a name="line.313"></a> -<span class="sourceLineNo">314</span> * @param get the Get request<a name="line.314"></a> -<span class="sourceLineNo">315</span> * @param result The result to return to the client if default processing<a name="line.315"></a> -<span class="sourceLineNo">316</span> * is bypassed. Can be modified. Will not be used if default processing<a name="line.316"></a> -<span class="sourceLineNo">317</span> * is not bypassed.<a name="line.317"></a> -<span class="sourceLineNo">318</span> */<a name="line.318"></a> -<span class="sourceLineNo">319</span> default void preGetOp(ObserverContext<RegionCoprocessorEnvironment> c, Get get, List<Cell> result)<a name="line.319"></a> -<span class="sourceLineNo">320</span> throws IOException {}<a name="line.320"></a> -<span class="sourceLineNo">321</span><a name="line.321"></a> -<span class="sourceLineNo">322</span> /**<a name="line.322"></a> -<span class="sourceLineNo">323</span> * Called after the client performs a Get<a name="line.323"></a> -<span class="sourceLineNo">324</span> * <p><a name="line.324"></a> -<span class="sourceLineNo">325</span> * Note: Do not retain references to any Cells in 'result' beyond the life of this invocation.<a name="line.325"></a> -<span class="sourceLineNo">326</span> * If need a Cell reference for later use, copy the cell and use that.<a name="line.326"></a> -<span class="sourceLineNo">327</span> * @param c the environment provided by the region server<a name="line.327"></a> -<span class="sourceLineNo">328</span> * @param get the Get request<a name="line.328"></a> -<span class="sourceLineNo">329</span> * @param result the result to return to the client, modify as necessary<a name="line.329"></a> -<span class="sourceLineNo">330</span> */<a name="line.330"></a> -<span class="sourceLineNo">331</span> default void postGetOp(ObserverContext<RegionCoprocessorEnvironment> c, Get get,<a name="line.331"></a> -<span class="sourceLineNo">332</span> List<Cell> result) throws IOException {}<a name="line.332"></a> -<span class="sourceLineNo">333</span><a name="line.333"></a> -<span class="sourceLineNo">334</span> /**<a name="line.334"></a> -<span class="sourceLineNo">335</span> * Called before the client tests for existence using a Get.<a name="line.335"></a> -<span class="sourceLineNo">336</span> * <p><a name="line.336"></a> -<span class="sourceLineNo">337</span> * Call CoprocessorEnvironment#bypass to skip default actions<a name="line.337"></a> -<span class="sourceLineNo">338</span> * @param c the environment provided by the region server<a name="line.338"></a> -<span class="sourceLineNo">339</span> * @param get the Get request<a name="line.339"></a> -<span class="sourceLineNo">340</span> * @param exists the result returned by the region server<a name="line.340"></a> -<span class="sourceLineNo">341</span> * @return the value to return to the client if bypassing default processing<a name="line.341"></a> -<span class="sourceLineNo">342</span> */<a name="line.342"></a> -<span class="sourceLineNo">343</span> default boolean preExists(ObserverContext<RegionCoprocessorEnvironment> c, Get get,<a name="line.343"></a> -<span class="sourceLineNo">344</span> boolean exists) throws IOException {<a name="line.344"></a> -<span class="sourceLineNo">345</span> return exists;<a name="line.345"></a> -<span class="sourceLineNo">346</span> }<a name="line.346"></a> -<span class="sourceLineNo">347</span><a name="line.347"></a> -<span class="sourceLineNo">348</span> /**<a name="line.348"></a> -<span class="sourceLineNo">349</span> * Called after the client tests for existence using a Get.<a name="line.349"></a> -<span class="sourceLineNo">350</span> * @param c the environment provided by the region server<a name="line.350"></a> -<span class="sourceLineNo">351</span> * @param get the Get request<a name="line.351"></a> -<span class="sourceLineNo">352</span> * @param exists the result returned by the region server<a name="line.352"></a> -<span class="sourceLineNo">353</span> * @return the result to return to the client<a name="line.353"></a> -<span class="sourceLineNo">354</span> */<a name="line.354"></a> -<span class="sourceLineNo">355</span> default boolean postExists(ObserverContext<RegionCoprocessorEnvironment> c, Get get,<a name="line.355"></a> -<span class="sourceLineNo">356</span> boolean exists) throws IOException {<a name="line.356"></a> -<span class="sourceLineNo">357</span> return exists;<a name="line.357"></a> -<span class="sourceLineNo">358</span> }<a name="line.358"></a> -<span class="sourceLineNo">359</span><a name="line.359"></a> -<span class="sourceLineNo">360</span> /**<a name="line.360"></a> -<span class="sourceLineNo">361</span> * Called before the client stores a value.<a name="line.361"></a> -<span class="sourceLineNo">362</span> * <p><a name="line.362"></a> -<span class="sourceLineNo">363</span> * Call CoprocessorEnvironment#bypass to skip default actions<a name="line.363"></a> -<span class="sourceLineNo">364</span> * <p><a name="line.364"></a> -<span class="sourceLineNo">365</span> * Note: Do not retain references to any Cells in 'put' beyond the life of this invocation.<a name="line.365"></a> -<span class="sourceLineNo">366</span> * If need a Cell reference for later use, copy the cell and use that.<a name="line.366"></a> -<span class="sourceLineNo">367</span> * @param c the environment provided by the region server<a name="line.367"></a> -<span class="sourceLineNo">368</span> * @param put The Put object<a name="line.368"></a> -<span class="sourceLineNo">369</span> * @param edit The WALEdit object that will be written to the wal<a name="line.369"></a> -<span class="sourceLineNo">370</span> * @param durability Persistence guarantee for this Put<a name="line.370"></a> -<span class="sourceLineNo">371</span> */<a name="line.371"></a> -<span class="sourceLineNo">372</span> default void prePut(ObserverContext<RegionCoprocessorEnvironment> c, Put put, WALEdit edit,<a name="line.372"></a> -<span class="sourceLineNo">373</span> Durability durability) throws IOException {}<a name="line.373"></a> -<span class="sourceLineNo">374</span><a name="line.374"></a> -<span class="sourceLineNo">375</span> /**<a name="line.375"></a> -<span class="sourceLineNo">376</span> * Called after the client stores a value.<a name="line.376"></a> -<span class="sourceLineNo">377</span> * <p><a name="line.377"></a> -<span class="sourceLineNo">378</span> * Note: Do not retain references to any Cells in 'put' beyond the life of this invocation.<a name="line.378"></a> -<span class="sourceLineNo">379</span> * If need a Cell reference for later use, copy the cell and use that.<a name="line.379"></a> -<span class="sourceLineNo">380</span> * @param c the environment provided by the region server<a name="line.380"></a> -<span class="sourceLineNo">381</span> * @param put The Put object<a name="line.381"></a> -<span class="sourceLineNo">382</span> * @param edit The WALEdit object for the wal<a name="line.382"></a> -<span class="sourceLineNo">383</span> * @param durability Persistence guarantee for this Put<a name="line.383"></a> -<span class="sourceLineNo">384</span> */<a name="line.384"></a> -<span class="sourceLineNo">385</span> default void postPut(ObserverContext<RegionCoprocessorEnvironment> c, Put put, WALEdit edit,<a name="line.385"></a> -<span class="sourceLineNo">386</span> Durability durability) throws IOException {}<a name="line.386"></a> -<span class="sourceLineNo">387</span><a name="line.387"></a> -<span class="sourceLineNo">388</span> /**<a name="line.388"></a> -<span class="sourceLineNo">389</span> * Called before the client deletes a value.<a name="line.389"></a> -<span class="sourceLineNo">390</span> * <p><a name="line.390"></a> -<span class="sourceLineNo">391</span> * Call CoprocessorEnvironment#bypass to skip default actions<a name="line.391"></a> -<span class="sourceLineNo">392</span> * <p><a name="line.392"></a> -<span class="sourceLineNo">393</span> * Note: Do not retain references to any Cells in 'delete' beyond the life of this invocation.<a name="line.393"></a> -<span class="sourceLineNo">394</span> * If need a Cell reference for later use, copy the cell and use that.<a name="line.394"></a> -<span class="sourceLineNo">395</span> * @param c the environment provided by the region server<a name="line.395"></a> -<span class="sourceLineNo">396</span> * @param delete The Delete object<a name="line.396"></a> -<span class="sourceLineNo">397</span> * @param edit The WALEdit object for the wal<a name="line.397"></a> -<span class="sourceLineNo">398</span> * @param durability Persistence guarantee for this Delete<a name="line.398"></a> -<span class="sourceLineNo">399</span> */<a name="line.399"></a> -<span class="sourceLineNo">400</span> default void preDelete(ObserverContext<RegionCoprocessorEnvironment> c, Delete delete,<a name="line.400"></a> -<span class="sourceLineNo">401</span> WALEdit edit, Durability durability) throws IOException {}<a name="line.401"></a> -<span class="sourceLineNo">402</span><a name="line.402"></a> -<span class="sourceLineNo">403</span> /**<a name="line.403"></a> -<span class="sourceLineNo">404</span> * Called before the server updates the timestamp for version delete with latest timestamp.<a name="line.404"></a> -<span class="sourceLineNo">405</span> * <p><a name="line.405"></a> -<span class="sourceLineNo">406</span> * Call CoprocessorEnvironment#bypass to skip default actions<a name="line.406"></a> -<span class="sourceLineNo">407</span> * @param c the environment provided by the region server<a name="line.407"></a> -<span class="sourceLineNo">408</span> * @param mutation - the parent mutation associated with this delete cell<a name="line.408"></a> -<span class="sourceLineNo">409</span> * @param cell - The deleteColumn with latest version cell<a name="line.409"></a> -<span class="sourceLineNo">410</span> * @param byteNow - timestamp bytes<a name="line.410"></a> -<span class="sourceLineNo">411</span> * @param get - the get formed using the current cell's row. Note that the get does not specify<a name="line.411"></a> -<span class="sourceLineNo">412</span> * the family and qualifier<a name="line.412"></a> -<span class="sourceLineNo">413</span> * @deprecated Since hbase-2.0.0. No replacement. To be removed in hbase-3.0.0 and replaced<a name="line.413"></a> -<span class="sourceLineNo">414</span> * with something that doesn't expose IntefaceAudience.Private classes.<a name="line.414"></a> -<span class="sourceLineNo">415</span> */<a name="line.415"></a> -<span class="sourceLineNo">416</span> @Deprecated<a name="line.416"></a> -<span class="sourceLineNo">417</span> default void prePrepareTimeStampForDeleteVersion(ObserverContext<RegionCoprocessorEnvironment> c,<a name="line.417"></a> -<span class="sourceLineNo">418</span> Mutation mutation, Cell cell, byte[] byteNow, Get get) throws IOException {}<a name="line.418"></a> -<span class="sourceLineNo">419</span><a name="line.419"></a> -<span class="sourceLineNo">420</span> /**<a name="line.420"></a> -<span class="sourceLineNo">421</span> * Called after the client deletes a value.<a name="line.421"></a> -<span class="sourceLineNo">422</span> * <p><a name="line.422"></a> -<span class="sourceLineNo">423</span> * Note: Do not retain references to any Cells in 'delete' beyond the life of this invocation.<a name="line.423"></a> -<span class="sourceLineNo">424</span> * If need a Cell reference for later use, copy the cell and use that.<a name="line.424"></a> -<span class="sourceLineNo">425</span> * @param c the environment provided by the region server<a name="line.425"></a> -<span class="sourceLineNo">426</span> * @param delete The Delete object<a name="line.426"></a> -<span class="sourceLineNo">427</span> * @param edit The WALEdit object for the wal<a name="line.427"></a> -<span class="sourceLineNo">428</span> * @param durability Persistence guarantee for this Delete<a name="line.428"></a> -<span class="sourceLineNo">429</span> */<a name="line.429"></a> -<span class="sourceLineNo">430</span> default void postDelete(ObserverContext<RegionCoprocessorEnvironment> c, Delete delete,<a name="line.430"></a> -<span class="sourceLineNo">431</span> WALEdit edit, Durability durability) throws IOException {}<a name="line.431"></a> -<span class="sourceLineNo">432</span><a name="line.432"></a> -<span class="sourceLineNo">433</span> /**<a name="line.433"></a> -<span class="sourceLineNo">434</span> * This will be called for every batch mutation operation happening at the server. This will be<a name="line.434"></a> -<span class="sourceLineNo">435</span> * called after acquiring the locks on the mutating rows and after applying the proper timestamp<a name="line.435"></a> -<span class="sourceLineNo">436</span> * for each Mutation at the server. The batch may contain Put/Delete. By setting OperationStatus<a name="line.436"></a> -<span class="sourceLineNo">437</span> * of Mutations ({@link MiniBatchOperationInProgress#setOperationStatus(int, OperationStatus)}),<a name="line.437"></a> -<span class="sourceLineNo">438</span> * {@link RegionObserver} can make Region to skip these Mutations.<a name="line.438"></a> -<span class="sourceLineNo">439</span> * <p><a name="line.439"></a> -<span class="sourceLineNo">440</span> * Note: Do not retain references to any Cells in Mutations beyond the life of this invocation.<a name="line.440"></a> -<span class="sourceLineNo">441</span> * If need a Cell reference for later use, copy the cell and use that.<a name="line.441"></a> -<span class="sourceLineNo">442</span> * @param c the environment provided by the region server<a name="line.442"></a> -<span class="sourceLineNo">443</span> * @param miniBatchOp batch of Mutations getting applied to region.<a name="line.443"></a> -<span class="sourceLineNo">444</span> */<a name="line.444"></a> -<span class="sourceLineNo">445</span> default void preBatchMutate(ObserverContext<RegionCoprocessorEnvironment> c,<a name="line.445"></a> -<span class="sourceLineNo">446</span> MiniBatchOperationInProgress<Mutation> miniBatchOp) throws IOException {}<a name="line.446"></a> -<span class="sourceLineNo">447</span><a name="line.447"></a> -<span class="sourceLineNo">448</span> /**<a name="line.448"></a> -<span class="sourceLineNo">449</span> * This will be called after applying a batch of Mutations on a region. The Mutations are added to<a name="line.449"></a> -<span class="sourceLineNo">450</span> * memstore and WAL. The difference of this one with<a name="line.450"></a> -<span class="sourceLineNo">451</span> * {@link #postPut(ObserverContext, Put, WALEdit, Durability) }<a name="line.451"></a> -<span class="sourceLineNo">452</span> * and {@link #postDelete(ObserverContext, Delete, WALEdit, Durability) } is<a name="line.452"></a> -<span class="sourceLineNo">453</span> * this hook will be executed before the mvcc transaction completion.<a name="line.453"></a> -<span class="sourceLineNo">454</span> * <p><a name="line.454"></a> -<span class="sourceLineNo">455</span> * Note: Do not retain references to any Cells in Mutations beyond the life of this invocation.<a name="line.455"></a> -<span class="sourceLineNo">456</span> * If need a Cell reference for later use, copy the cell and use that.<a name="line.456"></a> -<span class="sourceLineNo">457</span> * @param c the environment provided by the region server<a name="line.457"></a> -<span class="sourceLineNo">458</span> * @param miniBatchOp batch of Mutations applied to region. Coprocessors are discouraged from<a name="line.458"></a> -<span class="sourceLineNo">459</span> * manipulating its state.<a name="line.459"></a> -<span class="sourceLineNo">460</span> */<a name="line.460"></a> -<span class="sourceLineNo">461</span> // Coprocessors can do a form of bypass by changing state in miniBatchOp.<a name="line.461"></a> -<span class="sourceLineNo">462</span> default void postBatchMutate(ObserverContext<RegionCoprocessorEnvironment> c,<a name="line.462"></a> -<span class="sourceLineNo">463</span> MiniBatchOperationInProgress<Mutation> miniBatchOp) throws IOException {}<a name="line.463"></a> -<span class="sourceLineNo">464</span><a name="line.464"></a> -<span class="sourceLineNo">465</span> /**<a name="line.465"></a> -<span class="sourceLineNo">466</span> * This will be called for region operations where read lock is acquired in<a name="line.466"></a> -<span class="sourceLineNo">467</span> * {@link Region#startRegionOperation()}.<a name="line.467"></a> -<span class="sourceLineNo">468</span> * @param ctx<a name="line.468"></a> -<span class="sourceLineNo">469</span> * @param operation The operation is about to be taken on the region<a name="line.469"></a> -<span class="sourceLineNo">470</span> */<a name="line.470"></a> -<span class="sourceLineNo">471</span> default void postStartRegionOperation(ObserverContext<RegionCoprocessorEnvironment> ctx,<a name="line.471"></a> -<span class="sourceLineNo">472</span> Operation operation) throws IOException {}<a name="line.472"></a> -<span class="sourceLineNo">473</span><a name="line.473"></a> -<span class="sourceLineNo">474</span> /**<a name="line.474"></a> -<span class="sourceLineNo">475</span> * Called after releasing read lock in {@link Region#closeRegionOperation()}.<a name="line.475"></a> -<span class="sourceLineNo">476</span> * @param ctx<a name="line.476"></a> -<span class="sourceLineNo">477</span> * @param operation<a name="line.477"></a> -<span class="sourceLineNo">478</span> */<a name="line.478"></a> -<span class="sourceLineNo">479</span> default void postCloseRegionOperation(ObserverContext<RegionCoprocessorEnvironment> ctx,<a name="line.479"></a> -<span class="sourceLineNo">480</span> Operation operation) throws IOException {}<a name="line.480"></a> -<span class="sourceLineNo">481</span><a name="line.481"></a> -<span class="sourceLineNo">482</span> /**<a name="line.482"></a> -<span class="sourceLineNo">483</span> * Called after the completion of batch put/delete and will be called even if the batch operation<a name="line.483"></a> -<span class="sourceLineNo">484</span> * fails.<a name="line.484"></a> -<span class="sourceLineNo">485</span> * <p><a name="line.485"></a> -<span class="sourceLineNo">486</span> * Note: Do not retain references to any Cells in Mutations beyond the life of this invocation.<a name="line.486"></a> -<span class="sourceLineNo">487</span> * If need a Cell reference for later use, copy the cell and use that.<a name="line.487"></a> -<span class="sourceLineNo">488</span> * @param ctx<a name="line.488"></a> -<span class="sourceLineNo">489</span> * @param miniBatchOp<a name="line.489"></a> -<span class="sourceLineNo">490</span> * @param success true if batch operation is successful otherwise false.<a name="line.490"></a> -<span class="sourceLineNo">491</span> */<a name="line.491"></a> -<span class="sourceLineNo">492</span> default void postBatchMutateIndispensably(ObserverContext<RegionCoprocessorEnvironment> ctx,<a name="line.492"></a> -<span class="sourceLineNo">493</span> MiniBatchOperationInProgress<Mutation> miniBatchOp, boolean success) throws IOException {}<a name="line.493"></a> -<span class="sourceLineNo">494</span><a name="line.494"></a> -<span class="sourceLineNo">495</span> /**<a name="line.495"></a> -<span class="sourceLineNo">496</span> * Called before checkAndPut.<a name="line.496"></a> -<span class="sourceLineNo">497</span> * <p><a name="line.497"></a> -<span class="sourceLineNo">498</span> * Call 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class="sourceLineNo">517</span> }<a name="line.517"></a> -<span class="sourceLineNo">518</span><a name="line.518"></a> -<span class="sourceLineNo">519</span> /**<a name="line.519"></a> -<span class="sourceLineNo">520</span> * Called before checkAndPut but after acquiring rowlock.<a name="line.520"></a> -<span class="sourceLineNo">521</span> * <p><a name="line.521"></a> -<span class="sourceLineNo">522</span> * <b>Note:</b> Caution to be taken for not doing any long time operation in this hook.<a name="line.522"></a> -<span class="sourceLineNo">523</span> * Row will be locked for longer time. 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qualifier, CompareOperator op,<a name="line.542"></a> -<span class="sourceLineNo">543</span> ByteArrayComparable comparator, Put put, boolean result) throws IOException {<a name="line.543"></a> -<span class="sourceLineNo">544</span> return result;<a name="line.544"></a> -<span class="sourceLineNo">545</span> }<a name="line.545"></a> -<span class="sourceLineNo">546</span><a name="line.546"></a> -<span class="sourceLineNo">547</span> /**<a name="line.547"></a> -<span class="sourceLineNo">548</span> * Called after checkAndPut<a name="line.548"></a> -<span class="sourceLineNo">549</span> * <p><a name="line.549"></a> -<span class="sourceLineNo">550</span> * Note: Do not retain references to any Cells in 'put' beyond the life of this invocation.<a name="line.550"></a> -<span class="sourceLineNo">551</span> * If need a Cell reference for later use, copy the cell and use that.<a name="line.551"></a> -<span class="sourceLineNo">552</span> * @param c the environment provided by the region server<a name="line.552"></a> -<span class="sourceLineNo">553</span> * @param row row to check<a name="line.553"></a> -<span class="sourceLineNo">554</span> * @param family column family<a name="line.554"></a> -<span class="sourceLineNo">555</span> * @param qualifier column qualifier<a name="line.555"></a> -<span class="sourceLineNo">556</span> * @param op the comparison operation<a name="line.556"></a> -<span class="sourceLineNo">557</span> * @param comparator the comparator<a name="line.557"></a> -<span class="sourceLineNo">558</span> * @param put data to put if check succeeds<a name="line.558"></a> -<span class="sourceLineNo">559</span> * @param result from the checkAndPut<a name="line.559"></a> -<span class="sourceLineNo">560</span> * @return the possibly transformed return value to return to client<a name="line.560"></a> -<span class="sourceLineNo">561</span> */<a name="line.561"></a> -<span class="sourceLineNo">562</span> default boolean 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class="sourceLineNo">573</span> * Note: Do not retain references to any Cells in 'delete' beyond the life of this invocation.<a name="line.573"></a> -<span class="sourceLineNo">574</span> * If need a Cell reference for later use, copy the cell and use that.<a name="line.574"></a> -<span class="sourceLineNo">575</span> * @param c the environment provided by the region server<a name="line.575"></a> -<span class="sourceLineNo">576</span> * @param row row to check<a name="line.576"></a> -<span class="sourceLineNo">577</span> * @param family column family<a name="line.577"></a> -<span class="sourceLineNo">578</span> * @param qualifier column qualifier<a name="line.578"></a> -<span class="sourceLineNo">579</span> * @param op the comparison operation<a name="line.579"></a> -<span class="sourceLineNo">580</span> * @param comparator the comparator<a name="line.580"></a> -<span class="sourceLineNo">581</span> * @param delete delete to commit if check succeeds<a name="line.581"></a> -<span 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Called before checkAndDelete but after acquiring rowock.<a name="line.592"></a> -<span class="sourceLineNo">593</span> * <p><a name="line.593"></a> -<span class="sourceLineNo">594</span> * <b>Note:</b> Caution to be taken for not doing any long time operation in this hook.<a name="line.594"></a> -<span class="sourceLineNo">595</span> * Row will be locked for longer time. 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class="sourceLineNo">614</span> ByteArrayComparable comparator, Delete delete, boolean result) throws IOException {<a name="line.614"></a> -<span class="sourceLineNo">615</span> return result;<a name="line.615"></a> -<span class="sourceLineNo">616</span> }<a name="line.616"></a> -<span class="sourceLineNo">617</span><a name="line.617"></a> -<span class="sourceLineNo">618</span> /**<a name="line.618"></a> -<span class="sourceLineNo">619</span> * Called after checkAndDelete<a name="line.619"></a> -<span class="sourceLineNo">620</span> * <p><a name="line.620"></a> -<span class="sourceLineNo">621</span> * Note: Do not retain references to any Cells in 'delete' beyond the life of this invocation.<a name="line.621"></a> -<span class="sourceLineNo">622</span> * If need a Cell reference for later use, copy the cell and use that.<a name="line.622"></a> -<span class="sourceLineNo">623</span> * @param c the environment provided by the region server<a name="line.623"></a> -<span class="sourceLineNo">624</span> * @param row row to check<a name="line.624"></a> -<span class="sourceLineNo">625</span> * @param family column family<a name="line.625"></a> -<span class="sourceLineNo">626</span> * @param qualifier column qualifier<a name="line.626"></a> -<span class="sourceLineNo">627</span> * @param op the comparison operation<a name="line.627"></a> -<span class="sourceLineNo">628</span> * @param comparator the comparator<a name="line.628"></a> -<span class="sourceLineNo">629</span> * @param delete delete to commit if check succeeds<a name="line.629"></a> -<span class="sourceLineNo">630</span> * @param result from the CheckAndDelete<a name="line.630"></a> -<span class="sourceLineNo">631</span> * @return the possibly transformed returned value to return to client<a name="line.631"></a> -<span class="sourceLineNo">632</span> */<a name="line.632"></a> -<span class="sourceLineNo">633</span> default boolean postCheckAndDelete(ObserverContext<RegionCoprocessorEnvironment> c, byte[] row,<a name="line.633"></a> -<span class="sourceLineNo">634</span> byte[] family, byte[] qualifier, CompareOperator op, ByteArrayComparable comparator,<a name="line.634"></a> -<span class="sourceLineNo">635</span> Delete delete, boolean result) throws IOException {<a name="line.635"></a> -<span class="sourceLineNo">636</span> return result;<a name="line.636"></a> -<span class="sourceLineNo">637</span> }<a name="line.637"></a> -<span class="sourceLineNo">638</span><a name="line.638"></a> -<span class="sourceLineNo">639</span> /**<a name="line.639"></a> -<span class="sourceLineNo">640</span> * Called before Append.<a name="line.640"></a> -<span class="sourceLineNo">641</span> * <p><a name="line.641"></a> -<span class="sourceLineNo">642</span> * Call CoprocessorEnvironment#bypass to skip default actions<a name="line.642"></a> -<span class="sourceLineNo">643</span> * <p><a name="line.643"></a> -<span class="sourceLineNo">644</span> * Note: Do not retain references to any Cells in 'append' beyond the life of this invocation.<a name="line.644"></a> -<span class="sourceLineNo">645</span> * If need a Cell reference for later use, copy the cell and use that.<a name="line.645"></a> -<span class="sourceLineNo">646</span> * @param c the environment provided by the region server<a name="line.646"></a> -<span class="sourceLineNo">647</span> * @param append Append object<a name="line.647"></a> -<span class="sourceLineNo">648</span> * @return result to return to the client if bypassing default processing<a name="line.648"></a> -<span class="sourceLineNo">649</span> */<a name="line.649"></a> -<span class="sourceLineNo">650</span> default Result preAppend(ObserverContext<RegionCoprocessorEnvironment> c, Append append)<a name="line.650"></a> -<span class="sourceLineNo">651</span> throws IOException {<a name="line.651"></a> -<span class="sourceLineNo">652</span> return null;<a name="line.652"></a> -<span class="sourceLineNo">653</span> }<a name="line.653"></a> -<span 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a Cell reference for later use, copy the cell and use that.<a name="line.679"></a> -<span class="sourceLineNo">680</span> * @param c the environment provided by the region server<a name="line.680"></a> -<span class="sourceLineNo">681</span> * @param append Append object<a name="line.681"></a> -<span class="sourceLineNo">682</span> * @param result the result returned by increment<a name="line.682"></a> -<span class="sourceLineNo">683</span> * @return the result to return to the client<a name="line.683"></a> -<span class="sourceLineNo">684</span> */<a name="line.684"></a> -<span class="sourceLineNo">685</span> default Result postAppend(ObserverContext<RegionCoprocessorEnvironment> c, Append append,<a name="line.685"></a> -<span class="sourceLineNo">686</span> Result result) throws IOException {<a name="line.686"></a> -<span class="sourceLineNo">687</span> return result;<a name="line.687"></a> -<span class="sourceLineNo">688</span> }<a name="line.688"></a> -<span class="sourceLineNo">689</span><a name="line.689"></a> -<span class="sourceLineNo">690</span> /**<a name="line.690"></a> -<span class="sourceLineNo">691</span> * Called before Increment.<a name="line.691"></a> -<span class="sourceLineNo">692</span> * <p><a name="line.692"></a> -<span class="sourceLineNo">693</span> * Call CoprocessorEnvironment#bypass to skip default actions<a name="line.693"></a> -<span class="sourceLineNo">694</span> * <p><a name="line.694"></a> -<span class="sourceLineNo">695</span> * Note: Do not retain references to any Cells in 'increment' beyond the life of this invocation.<a name="line.695"></a> -<span class="sourceLineNo">696</span> * If need a Cell reference for later use, copy the cell and use that.<a name="line.696"></a> -<span class="sourceLineNo">697</span> * @param c the environment provided by the region server<a name="line.697"></a> -<span class="sourceLineNo">698</span> * @param increment increment object<a name="line.698"></a> -<span class="sourceLineNo">699</span> * @return result to return to the client if bypassing default processing<a name="line.699"></a> -<span class="sourceLineNo">700</span> */<a name="line.700"></a> -<span class="sourceLineNo">701</span> default Result preIncrement(ObserverContext<RegionCoprocessorEnvironment> c, Increment increment)<a name="line.701"></a> -<span class="sourceLineNo">702</span> throws IOException {<a name="line.702"></a> -<span class="sourceLineNo">703</span> return null;<a name="line.703"></a> -<span class="sourceLineNo">704</span> }<a name="line.704"></a> -<span class="sourceLineNo">705</span><a name="line.705"></a> -<span class="sourceLineNo">706</span> /**<a name="line.706"></a> -<span class="sourceLineNo">707</span> * Called before Increment but after acquiring rowlock.<a name="line.707"></a> -<span class="sourceLineNo">708</span> * <p><a name="line.708"></a> -<span class="sourceLineNo">709</span> * <b>Note:</b> Caution to be taken for not doing any long time operation in this hook.<a name="line.709"></a> -<span class="sourceLineNo">710</span> * Row will be locked for longer time. Trying to acquire lock on another row, within this,<a name="line.710"></a> -<span class="sourceLineNo">711</span> * can lead to potential deadlock.<a name="line.711"></a> -<span class="sourceLineNo">712</span> * <p><a name="line.712"></a> -<span class="sourceLineNo">713</span> * Call CoprocessorEnvironment#bypass to skip default actions<a name="line.713"></a> -<span class="sourceLineNo">714</span> * <p><a name="line.714"></a> -<span class="sourceLineNo">715</span> * Note: Do not retain references to any Cells in 'increment' beyond the life of this invocation.<a name="line.715"></a> -<span class="sourceLineNo">716</span> * If need a Cell reference for later use, copy the cell and use that.<a name="line.716"></a> -<span class="sourceLineNo">717</span> *<a name="line.717"></a> -<span class="sourceLineNo">718</span> * @param c<a name="line.718"></a> -<span class="sourceLineNo">719</span> * the environment provided by the region server<a name="line.719"></a> -<span class="sourceLineNo">720</span> * @param increment<a name="line.720"></a> -<span class="sourceLineNo">721</span> * increment object<a name="line.721"></a> -<span class="sourceLineNo">722</span> * @return result to return to the client if bypassing default processing<a name="line.722"></a> -<span class="sourceLineNo">723</span> * if an error occurred on the coprocessor<a name="line.723"></a> -<span class="sourceLineNo">724</span> */<a name="line.724"></a> -<span class="sourceLineNo">725</span> default Result preIncrementAfterRowLock(ObserverContext<RegionCoprocessorEnvironment> c,<a name="line.725"></a> -<span class="sourceLineNo">726</span> Increment increment) throws IOException {<a name="line.726"></a> -<span class="sourceLineNo">727</span> return null;<a name="line.727"></a> -<span class="sourceLineNo">728</span> }<a name="line.728"></a> -<span class="sourceLineNo">729</span><a name="line.729"></a> -<span class="sourceLineNo">730</span> /**<a name="line.730"></a> -<span class="sourceLineNo">731</span> * Called after increment<a name="line.731"></a> -<span class="sourceLineNo">732</span> * <p><a name="line.732"></a> -<span class="sourceLineNo">733</span> * Note: Do not retain references to any Cells in 'increment' beyond the life of this invocation.<a name="line.733"></a> -<span class="sourceLineNo">734</span> * If need a Cell reference for later use, copy the cell and use that.<a name="line.734"></a> -<span class="sourceLineNo">735</span> * @param c the environment provided by the region server<a name="line.735"></a> -<span class="sourceLineNo">736</span> * @param increment increment object<a name="line.736"></a> -<span class="sourceLineNo">737</span> * @param result the result returned by increment<a name="line.737"></a> -<span class="sourceLineNo">738</span> * @return the result to return to the client<a name="line.738"></a> -<span class="sourceLineNo">739</span> */<a name="line.739"></a> -<span class="sourceLineNo">740</span> default Result postIncrement(ObserverContext<RegionCoprocessorEnvironment> c, Increment increment,<a name="line.740"></a> -<span class="sourceLineNo">741</span> Result result) throws IOException {<a name="line.741"></a> -<span class="sourceLineNo">742</span> return result;<a name="line.742"></a> -<span class="sourceLineNo">743</span> }<a name="line.743"></a> -<span class="sourceLineNo">744</span><a name="line.744"></a> -<span class="sourceLineNo">745</span> /**<a name="line.745"></a> -<span class="sourceLineNo">746</span> * Called before the client opens a new scanner.<a name="line.746"></a> -<span class="sourceLineNo">747</span> * <p><a name="line.747"></a> -<span class="sourceLineNo">748</span> * Note: Do not retain references to any Cells returned by scanner, beyond the life of this<a name="line.748"></a> -<span class="sourceLineNo">749</span> * invocation. If need a Cell reference for later use, copy the cell and use that.<a name="line.749"></a> -<span class="sourceLineNo">750</span> * @param c the environment provided by the region server<a name="line.750"></a> -<span class="sourceLineNo">751</span> * @param scan the Scan specification<a name="line.751"></a> -<span class="sourceLineNo">752</span> */<a name="line.752"></a> -<span class="sourceLineNo">753</span> default void preScannerOpen(ObserverContext<RegionCoprocessorEnvironment> c, Scan scan)<a name="line.753"></a> -<span class="sourceLineNo">754</span> throws IOException {<a name="line.754"></a> -<span class="sourceLineNo">755</span> }<a name="line.755"></a> -<span class="sourceLineNo">756</span><a name="line.756"></a> -<span class="sourceLineNo">757</span> /**<a name="line.757"></a> -<span class="sourceLineNo">758</span> * Called after the client opens a new scanner.<a name="line.758"></a> -<span class="sourceLineNo">759</span> * <p><a name="line.759"></a> -<span class="sourceLineNo">760</span> * Note: Do not retain references to any Cells returned by scanner, beyond the life of this<a name="line.760"></a> -<span class="sourceLineNo">761</span> * invocation. If need a Cell reference for later use, copy the cell and use that.<a name="line.761"></a> -<span class="sourceLineNo">762</span> * @param c the environment provided by the region server<a name="line.762"></a> -<span class="sourceLineNo">763</span> * @param scan the Scan specification<a name="line.763"></a> -<span class="sourceLineNo">764</span> * @param s if not null, the base scanner<a name="line.764"></a> -<span class="sourceLineNo">765</span> * @return the scanner instance to use<a name="line.765"></a> +<span class="sourceLineNo">223</span> * If 'bypass' is set, we skip out on calling any subsequent chained coprocessors.<a name="line.223"></a> +<span class="sourceLineNo">224</span> * @param c the environment provided by the region server<a name="line.224"></a> +<span class="sourceLineNo">225</span> * @param store the store where compaction is being requested<a name="line.225"></a> +<span class="sourceLineNo">226</span> * @param candidates the store files currently available for compaction<a name="line.226"></a> +<span class="sourceLineNo">227</span> * @param tracker tracker used to track the life cycle of a compaction<a name="line.227"></a> +<span class="sourceLineNo">228</span> */<a name="line.228"></a> +<span class="sourceLineNo">229</span> default void preCompactSelection(ObserverContext<RegionCoprocessorEnvironment> c, Store store,<a name="line.229"></a> +<span class="sourceLineNo">230</span> List<? extends StoreFile> candidates, CompactionLifeCycleTracker tracker)<a name="line.230"></a> +<span class="sourceLineNo">231</span> throws IOException {}<a name="line.231"></a> +<span class="sourceLineNo">232</span><a name="line.232"></a> +<span class="sourceLineNo">233</span> /**<a name="line.233"></a> +<span class="sourceLineNo">234</span> * Called after the {@link StoreFile}s to compact have been selected from the available<a name="line.234"></a> +<span class="sourceLineNo">235</span> * candidates.<a name="line.235"></a> +<span class="sourceLineNo">236</span> * @param c the environment provided by the region server<a name="line.236"></a> +<span class="sourceLineNo">237</span> * @param store the store being compacted<a name="line.237"></a> +<span class="sourceLineNo">238</span> * @param selected the store files selected to compact<a name="line.238"></a> +<span class="sourceLineNo">239</span> * @param tracker tracker used to track the life cycle of a compaction<a name="line.239"></a> +<span class="sourceLineNo">240</span> * @param request the requested compaction<a name="line.240"></a> +<span class="sourceLineNo">241</span> */<a name="line.241"></a> +<span class="sourceLineNo">242</span> default void postCompactSelection(ObserverContext<RegionCoprocessorEnvironment> c, Store store,<a name="line.242"></a> +<span class="sourceLineNo">243</span> List<? extends StoreFile> selected, CompactionLifeCycleTracker tracker,<a name="line.243"></a> +<span class="sourceLineNo">244</span> CompactionRequest request) {}<a name="line.244"></a> +<span class="sourceLineNo">245</span><a name="line.245"></a> +<span class="sourceLineNo">246</span> /**<a name="line.246"></a> +<span class="sourceLineNo">247</span> * Called before we open store scanner for compaction. You can use the {@code options} to change max<a name="line.247"></a> +<span class="sourceLineNo">248</span> * versions and TTL for the scanner being opened.<a name="line.248"></a> +<span class="sourceLineNo">249</span> * @param c the environment provided by the region server<a name="line.249"></a> +<span class="sourceLineNo">250</span> * @param store the store being compacted<a name="line.250"></a> +<span class="sourceLineNo">251</span> * @param scanType type of Scan<a name="line.251"></a> +<span class="sourceLineNo">252</span> * @param options used to change max versions and TTL for the scanner being opened<a name="line.252"></a> +<span class="sourceLineNo">253</span> * @param tracker tracker used to track the life cycle of a compaction<a name="line.253"></a> +<span class="sourceLineNo">254</span> * @param request the requested compaction<a name="line.254"></a> +<span class="sourceLineNo">255</span> */<a name="line.255"></a> +<span class="sourceLineNo">256</span> default void preCompactScannerOpen(ObserverContext<RegionCoprocessorEnvironment> c, Store store,<a name="line.256"></a> +<span class="sourceLineNo">257</span> ScanType scanType, ScanOptions options, CompactionLifeCycleTracker tracker,<a name="line.257"></a> +<span class="sourceLineNo">258</span> CompactionRequest request) throws IOException {}<a name="line.258"></a> +<span class="sourceLineNo">259</span><a name="line.259"></a> +<span class="sourceLineNo">260</span> /**<a name="line.260"></a> +<span class="sourceLineNo">261</span> * Called prior to writing the {@link StoreFile}s selected for compaction into a new<a name="line.261"></a> +<span class="sourceLineNo">262</span> * {@code StoreFile}.<a name="line.262"></a> +<span class="sourceLineNo">263</span> * <p><a name="line.263"></a> +<span class="sourceLineNo">264</span> * To override or modify the compaction process, implementing classes can wrap the provided<a name="line.264"></a> +<span class="sourceLineNo">265</span> * {@link InternalScanner} with a custom implementation that is returned from this method. The<a name="line.265"></a> +<span class="sourceLineNo">266</span> * custom scanner can then inspect {@link org.apache.hadoop.hbase.Cell}s from the wrapped scanner,<a name="line.266"></a> +<span class="sourceLineNo">267</span> * applying its own policy to what gets written.<a name="line.267"></a> +<span class="sourceLineNo">268</span> * @param c the environment provided by the region server<a name="line.268"></a> +<span class="sourceLineNo">269</span> * @param store the store being compacted<a name="line.269"></a> +<span class="sourceLineNo">270</span> * @param scanner the scanner over existing data used in the store file rewriting<a name="line.270"></a> +<span class="sourceLineNo">271</span> * @param scanType type of Scan<a name="line.271"></a> +<span class="sourceLineNo">272</span> * @param tracker tracker used to track the life cycle of a compaction<a name="line.272"></a> +<span class="sourceLineNo">273</span> * @param request the requested compaction<a name="line.273"></a> +<span class="sourceLineNo">274</span> * @return the scanner to use during compaction. Should not be {@code null} unless the<a name="line.274"></a> +<span class="sourceLineNo">275</span> * implementation is writing new store files on its own.<a name="line.275"></a> +<span class="sourceLineNo">276</span> */<a name="line.276"></a> +<span class="sourceLineNo">277</span> default InternalScanner preCompact(ObserverContext<RegionCoprocessorEnvironment> c, Store store,<a name="line.277"></a> +<span class="sourceLineNo">278</span> InternalScanner scanner, ScanType scanType, CompactionLifeCycleTracker tracker,<a name="line.278"></a> +<span class="sourceLineNo">279</span> CompactionRequest request) throws IOException {<a name="line.279"></a> +<span class="sourceLineNo">280</span> return scanner;<a name="line.280"></a> +<span class="sourceLineNo">281</span> }<a name="line.281"></a> +<span class="sourceLineNo">282</span><a name="line.282"></a> +<span class="sourceLineNo">283</span> /**<a name="line.283"></a> +<span class="sourceLineNo">284</span> * Called after compaction has completed and the new store file has been moved in to place.<a name="line.284"></a> +<span class="sourceLineNo">285</span> * @param c the environment provided by the region server<a name="line.285"></a> +<span class="sourceLineNo">286</span> * @param store the store being compacted<a name="line.286"></a> +<span class="sourceLineNo">287</span> * @param resultFile the new store file written out during compaction<a name="line.287"></a> +<span class="sourceLineNo">288</span> * @param tracker used to track the life cycle of a compaction<a name="line.288"></a> +<span class="sourceLineNo">289</span> * @param request the requested compaction<a name="line.289"></a> +<span class="sourceLineNo">290</span> */<a name="line.290"></a> +<span class="sourceLineNo">291</span> default void postCompact(ObserverContext<RegionCoprocessorEnvironment> c, Store store,<a name="line.291"></a> +<span class="sourceLineNo">292</span> StoreFile resultFile, CompactionLifeCycleTracker tracker, CompactionRequest request)<a name="line.292"></a> +<span class="sourceLineNo">293</span> throws IOException {}<a name="line.293"></a> +<span class="sourceLineNo">294</span><a name="line.294"></a> +<span class="sourceLineNo">295</span> /**<a name="line.295"></a> +<span class="sourceLineNo">296</span> * Called before the region is reported as closed to the master.<a name="line.296"></a> +<span class="sourceLineNo">297</span> * @param c the environment provided by the region server<a name="line.297"></a> +<span class="sourceLineNo">298</span> * @param abortRequested true if the region server is aborting<a name="line.298"></a> +<span class="sourceLineNo">299</span> */<a name="line.299"></a> +<span class="sourceLineNo">300</span> default void preClose(ObserverContext<RegionCoprocessorEnvironment> c, boolean abortRequested)<a name="line.300"></a> +<span class="sourceLineNo">301</span> throws IOException {}<a name="line.301"></a> +<span class="sourceLineNo">302</span><a name="line.302"></a> +<span class="sourceLineNo">303</span> /**<a name="line.303"></a> +<span class="sourceLineNo">304</span> * Called after the region is reported as closed to the master.<a name="line.304"></a> +<span class="sourceLineNo">305</span> * @param c the environment provided by the region server<a name="line.305"></a> +<span class="sourceLineNo">306</span> * @param abortRequested true if the region server is aborting<a name="line.306"></a> +<span class="sourceLineNo">307</span> */<a name="line.307"></a> +<span class="sourceLineNo">308</span> default void postClose(ObserverContext<RegionCoprocessorEnvironment> c, boolean abortRequested) {}<a name="line.308"></a> +<span class="sourceLineNo">309</span><a name="line.309"></a> +<span class="sourceLineNo">310</span> /**<a name="line.310"></a> +<span class="sourceLineNo">311</span> * Called before the client performs a Get<a name="line.311"></a> +<span class="sourceLineNo">312</span> * <p><a name="line.312"></a> +<span class="sourceLineNo">313</span> * Call CoprocessorEnvironment#bypass to skip default actions.<a name="line.313"></a> +<span class="sourceLineNo">314</span> * If 'bypass' is set, we skip out on calling any subsequent chained coprocessors.<a name="line.314"></a> +<span class="sourceLineNo">315</span> * @param c the environment provided by the region server<a name="line.315"></a> +<span class="sourceLineNo">316</span> * @param get the Get request<a name="line.316"></a> +<span class="sourceLineNo">317</span> * @param result The result to return to the client if default processing<a name="line.317"></a> +<span class="sourceLineNo">318</span> * is bypassed. Can be modified. Will not be used if default processing<a name="line.318"></a> +<span class="sourceLineNo">319</span> * is not bypassed.<a name="line.319"></a> +<span class="sourceLineNo">320</span> */<a name="line.320"></a> +<span class="sourceLineNo">321</span> default void preGetOp(ObserverContext<RegionCoprocessorEnvironment> c, Get get, List<Cell> result)<a name="line.321"></a> +<span class="sourceLineNo">322</span> throws IOException {}<a name="line.322"></a> +<span class="sourceLineNo">323</span><a name="line.323"></a> +<span class="sourceLineNo">324</span> /**<a name="line.324"></a> +<span class="sourceLineNo">325</span> * Called after the client performs a Get<a name="line.325"></a> +<span class="sourceLineNo">326</span> * <p><a name="line.326"></a> +<span class="sourceLineNo">327</span> * Note: Do not retain references to any Cells in 'result' beyond the life of this invocation.<a name="line.327"></a> +<span class="sourceLineNo">328</span> * If need a Cell reference for later use, copy the cell and use that.<a name="line.328"></a> +<span class="sourceLineNo">329</span> * @param c the environment provided by the region server<a name="line.329"></a> +<span class="sourceLineNo">330</span> * @param get the Get request<a name="line.330"></a> +<span class="sourceLineNo">331</span> * @param result the result to return to the client, modify as necessary<a name="line.331"></a> +<span class="sourceLineNo">332</span> */<a name="line.332"></a> +<span class="sourceLineNo">333</span> default void postGetOp(ObserverContext<RegionCoprocessorEnvironment> c, Get get,<a name="line.333"></a> +<span class="sourceLineNo">334</span> List<Cell> result) throws IOException {}<a name="line.334"></a> +<span class="sourceLineNo">335</span><a name="line.335"></a> +<span class="sourceLineNo">336</span> /**<a name="line.336"></a> +<span class="sourceLineNo">337</span> * Called before the client tests for existence using a Get.<a name="line.337"></a> +<span class="sourceLineNo">338</span> * <p><a name="line.338"></a> +<span class="sourceLineNo">339</span> * Call CoprocessorEnvironment#bypass to skip default actions.<a name="line.339"></a> +<span class="sourceLineNo">340</span> * If 'bypass' is set, we skip out on calling any subsequent chained coprocessors.<a name="line.340"></a> +<span class="sourceLineNo">341</span> * @param c the environment provided by the region server<a name="line.341"></a> +<span class="sourceLineNo">342</span> * @param get the Get request<a name="line.342"></a> +<span class="sourceLineNo">343</span> * @param exists the result returned by the region server<a name="line.343"></a> +<span class="sourceLineNo">344</span> * @return the value to return to the client if bypassing default processing<a name="line.344"></a> +<span class="sourceLineNo">345</span> */<a name="line.345"></a> +<span class="sourceLineNo">346</span> default boolean preExists(ObserverContext<RegionCoprocessorEnvironment> c, Get get,<a name="line.346"></a> +<span class="sourceLineNo">347</span> boolean exists) throws IOException {<a name="line.347"></a> +<span class="sourceLineNo">348</span> return exists;<a name="line.348"></a> +<span class="sourceLineNo">349</span> }<a name="line.349"></a> +<span class="sourceLineNo">350</span><a name="line.350"></a> +<span class="sourceLineNo">351</span> /**<a name="line.351"></a> +<span class="sourceLineNo">352</span> * Called after the client tests for existence using a Get.<a name="line.352"></a> +<span class="sourceLineNo">353</span> * @param c the environment provided by the region server<a name="line.353"></a> +<span class="sourceLineNo">354</span> * @param get the Get request<a name="line.354"></a> +<span class="sourceLineNo">355</span> * @param exists the result returned by the region server<a name="line.355"></a> +<span class="sourceLineNo">356</span> * @return the result to return to the client<a name="line.356"></a> +<span class="sourceLineNo">357</span> */<a name="line.357"></a> +<span class="sourceLineNo">358</span> default boolean postExists(ObserverContext<RegionCoprocessorEnvironment> c, Get get,<a name="line.358"></a> +<span class="sourceLineNo">359</span> boolean exists) throws IOException {<a name="line.359"></a> +<span class="sourceLineNo">360</span> return exists;<a name="line.360"></a> +<span class="sourceLineNo">361</span> }<a name="line.361"></a> +<span class="sourceLineNo">362</span><a name="line.362"></a> +<span class="sourceLineNo">363</span> /**<a name="line.363"></a> +<span class="sourceLineNo">364</span> * Called before the client stores a value.<a name="line.364"></a> +<span class="sourceLineNo">365</span> * <p><a name="line.365"></a> +<span class="sourceLineNo">366</span> * Call CoprocessorEnvironment#bypass to skip default actions.<a name="line.366"></a> +<span class="sourceLineNo">367</span> * If 'bypass' is set, we skip out on calling any subsequent chained coprocessors.<a name="line.367"></a> +<span class="sourceLineNo">368</span> * <p><a name="line.368"></a> +<span class="sourceLineNo">369</span> * Note: Do not retain references to any Cells in 'put' beyond the life of this invocation.<a name="line.369"></a> +<span class="sourceLineNo">370</span> * If need a Cell reference for later use, copy the cell and use that.<a name="line.370"></a> +<span class="sourceLineNo">371</span> * @param c the environment provided by the region server<a name="line.371"></a> +<span class="sourceLineNo">372</span> * @param put The Put object<a name="line.372"></a> +<span class="sourceLineNo">373</span> * @param edit The WALEdit object that will be written to the wal<a name="line.373"></a> +<span class="sourceLineNo">374</span> * @param durability Persistence guarantee for this Put<a name="line.374"></a> +<span class="sourceLineNo">375</span> */<a name="line.375"></a> +<span class="sourceLineNo">376</span> default void prePut(ObserverContext<RegionCoprocessorEnvironment> c, Put put, WALEdit edit,<a name="line.376"></a> +<span class="sourceLineNo">377</span> Durability durability) throws IOException {}<a name="line.377"></a> +<span class="sourceLineNo">378</span><a name="line.378"></a> +<span class="sourceLineNo">379</span> /**<a name="line.379"></a> +<span class="sourceLineNo">380</span> * Called after the client stores a value.<a name="line.380"></a> +<span class="sourceLineNo">381</span> * <p><a name="line.381"></a> +<span class="sourceLineNo">382</span> * Note: Do not retain references to any Cells in 'put' beyond the life of this invocation.<a name="line.382"></a> +<span class="sourceLineNo">383</span> * If need a Cell reference for later use, copy the cell and use that.<a name="line.383"></a> +<span class="sourceLineNo">384</span> * @param c the environment provided by the region server<a name="line.384"></a> +<span class="sourceLineNo">385</span> * @param put The Put object<a name="line.385"></a> +<span class="sourceLineNo">386</span> * @param edit The WALEdit object for the wal<a name="line.386"></a> +<span class="sourceLineNo">387</span> * @param durability Persistence guarantee for this Put<a name="line.387"></a> +<span class="sourceLineNo">388</span> */<a name="line.388"></a> +<span class="sourceLineNo">389</span> default void postPut(ObserverContext<RegionCoprocessorEnvironment> c, Put put, WALEdit edit,<a name="line.389"></a> +<span class="sourceLineNo">390</span> Durability durability) throws IOException {}<a name="line.390"></a> +<span class="sourceLineNo">391</span><a name="line.391"></a> +<span class="sourceLineNo">392</span> /**<a name="line.392"></a> +<span class="sourceLineNo">393</span> * Called before the client deletes a value.<a name="line.393"></a> +<span class="sourceLineNo">394</span> * <p><a name="line.394"></a> +<span class="sourceLineNo">395</span> * Call CoprocessorEnvironment#bypass to skip default actions.<a name="line.395"></a> +<span class="sourceLineNo">396</span> * If 'bypass' is set, we skip out on calling any subsequent chained coprocessors.<a name="line.396"></a> +<span class="sourceLineNo">397</span> * <p><a name="line.397"></a> +<span class="sourceLineNo">398</span> * Note: Do not retain references to any Cells in 'delete' beyond the life of this invocation.<a name="line.398"></a> +<span class="sourceLineNo">399</span> * If need a Cell reference for later use, copy the cell and use that.<a name="line.399"></a> +<span class="sourceLineNo">400</span> * @param c the environment provided by the region server<a name="line.400"></a> +<span class="sourceLineNo">401</span> * @param delete The Delete object<a name="line.401"></a> +<span class="sourceLineNo">402</span> * @param edit The WALEdit object for the wal<a name="line.402"></a> +<span class="sourceLineNo">403</span> * @param durability Persistence guarantee for this Delete<a name="line.403"></a> +<span class="sourceLineNo">404</span> */<a name="line.404"></a> +<span class="sourceLineNo">405</span> default void preDelete(ObserverContext<RegionCoprocessorEnvironment> c, Delete delete,<a name="line.405"></a> +<span class="sourceLineNo">406</span> WALEdit edit, Durability durability) throws IOException {}<a name="line.406"></a> +<span class="sourceLineNo">407</span><a name="line.407"></a> +<span class="sourceLineNo">408</span> /**<a name="line.408"></a> +<span class="sourceLineNo">409</span> * Called before the server updates the timestamp for version delete with latest timestamp.<a name="line.409"></a> +<span class="sourceLineNo">410</span> * <p><a name="line.410"></a> +<span class="sourceLineNo">411</span> * Call CoprocessorEnvironment#bypass to skip default actions.<a name="line.411"></a> +<span class="sourceLineNo">412</span> * If 'bypass' is set, we skip out on calling any subsequent chained coprocessors.<a name="line.412"></a> +<span class="sourceLineNo">413</span> * @param c the environment provided by the region server<a name="line.413"></a> +<span class="sourceLineNo">414</span> * @param mutation - the parent mutation associated with this delete cell<a name="line.414"></a> +<span class="sourceLineNo">415</span> * @param cell - The deleteColumn with latest version cell<a name="line.415"></a> +<span class="sourceLineNo">416</span> * @param byteNow - timestamp bytes<a name="line.416"></a> +<span class="sourceLineNo">417</span> * @param get - the get formed using the current cell's row. Note that the get does not specify<a name="line.417"></a> +<span class="sourceLineNo">418</span> * the family and qualifier<a name="line.418"></a> +<span class="sourceLineNo">419</span> * @deprecated Since hbase-2.0.0. No replacement. To be removed in hbase-3.0.0 and replaced<a name="line.419"></a> +<span class="sourceLineNo">420</span> * with something that doesn't expose IntefaceAudience.Private classes.<a name="line.420"></a> +<span class="sourceLineNo">421</span> */<a name="line.421"></a> +<span class="sourceLineNo">422</span> @Deprecated<a name="line.422"></a> +<span class="sourceLineNo">423</span> default void prePrepareTimeStampForDeleteVersion(ObserverContext<RegionCoprocessorEnvironment> c,<a name="line.423"></a> +<span class="sourceLineNo">424</span> Mutation mutation, Cell cell, byte[] byteNow, Get get) throws IOException {}<a name="line.424"></a> +<span class="sourceLineNo">425</span><a name="line.425"></a> +<span class="sourceLineNo">426</span> /**<a name="line.426"></a> +<span class="sourceLineNo">427</span> * Called after the client deletes a value.<a name="line.427"></a> +<span class="sourceLineNo">428</span> * <p><a name="line.428"></a> +<span class="sourceLineNo">429</span> * Note: Do not retain references to any Cells in 'delete' beyond the life of this invocation.<a name="line.429"></a> +<span class="sourceLineNo">430</span> * If need a Cell reference for later use, copy the cell and use that.<a name="line.430"></a> +<span class="sourceLineNo">431</span> * @param c the environment provided by the region server<a name="line.431"></a> +<span class="sourceLineNo">432</span> * @param delete The Delete object<a name="line.432"></a> +<span class="sourceLineNo">433</span> * @param edit The WALEdit object for the wal<a name="line.433"></a> +<span class="sourceLineNo">434</span> * @param durability Persistence guarantee for this Delete<a name="line.434"></a> +<span class="sourceLineNo">435</span> */<a name="line.435"></a> +<span class="sourceLineNo">436</span> default void postDelete(ObserverContext<RegionCoprocessorEnvironment> c, Delete delete,<a name="line.436"></a> +<span class="sourceLineNo">437</span> WALEdit edit, Durability durability) throws IOException {}<a name="line.437"></a> +<span class="sourceLineNo">438</span><a name="line.438"></a> +<span class="sourceLineNo">439</span> /**<a name="line.439"></a> +<span class="sourceLineNo">440</span> * This will be called for every batch mutation operation happening at the server. This will be<a name="line.440"></a> +<span class="sourceLineNo">441</span> * called after acquiring the locks on the mutating rows and after applying the proper timestamp<a name="line.441"></a> +<span class="sourceLineNo">442</span> * for each Mutation at the server. The batch may contain Put/Delete. By setting OperationStatus<a name="line.442"></a> +<span class="sourceLineNo">443</span> * of Mutations ({@link MiniBatchOperationInProgress#setOperationStatus(int, OperationStatus)}),<a name="line.443"></a> +<span class="sourceLineNo">444</span> * {@link RegionObserver} can make Region to skip these Mutations.<a name="line.444"></a> +<span class="sourceLineNo">445</span> * <p><a name="line.445"></a> +<span class="sourceLineNo">446</span> * Note: Do not retain references to any Cells in Mutations beyond the life of this invocation.<a name="line.446"></a> +<span class="sourceLineNo">447</span> * If need a Cell reference for later use, copy the cell and use that.<a name="line.447"></a> +<span class="sourceLineNo">448</span> * @param c the environment provided by the region server<a name="line.448"></a> +<span class="sourceLineNo">449</span> * @param miniBatchOp batch of Mutations getting applied to region.<a name="line.449"></a> +<span class="sourceLineNo">450</span> */<a name="line.450"></a> +<span class="sourceLineNo">451</span> default void preBatchMutate(ObserverContext<RegionCoprocessorEnvironment> c,<a name="line.451"></a> +<span class="sourceLineNo">452</span> MiniBatchOperationInProgress<Mutation> miniBatchOp) throws IOException {}<a name="line.452"></a> +<span class="sourceLineNo">453</span><a name="line.453"></a> +<span class="sourceLineNo">454</span> /**<a name="line.454"></a> +<span class="sourceLineNo">455</span> * This will be called after applying a batch of Mutations on a region. The Mutations are added to<a name="line.455"></a> +<span class="sourceLineNo">456</span> * memstore and WAL. The difference of this one with<a name="line.456"></a> +<span class="sourceLineNo">457</span> * {@link #postPut(ObserverContext, Put, WALEdit, Durability) }<a name="line.457"></a> +<span class="sourceLineNo">458</span> * and {@link #postDelete(ObserverContext, Delete, WALEdit, Durability) } is<a name="line.458"></a> +<span class="sourceLineNo">459</span> * this hook will be executed before the mvcc transaction completion.<a name="line.459"></a> +<span class="sourceLineNo">460</span> * <p><a name="line.460"></a> +<span class="sourceLineNo">461</span> * Note: Do not retain references to any Cells in Mutations beyond the life of this invocation.<a name="line.461"></a> +<span class="sourceLineNo">462</span> * If need a Cell reference for later use, copy the cell and use that.<a name="line.462"></a> +<span class="sourceLineNo">463</span> * @param c the environment provided by the region server<a name="line.463"></a> +<span class="sourceLineNo">464</span> * @param miniBatchOp batch of Mutations applied to region. Coprocessors are discouraged from<a name="line.464"></a> +<span class="sourceLineNo">465</span> * manipulating its state.<a name="line.465"></a> +<span class="sourceLineNo">466</span> */<a name="line.466"></a> +<span class="sourceLineNo">467</span> // Coprocessors can do a form of bypass by changing state in miniBatchOp.<a name="line.467"></a> +<span class="sourceLineNo">468</span> default void postBatchMutate(ObserverContext<RegionCoprocessorEnvironment> c,<a name="line.468"></a> +<span class="sourceLineNo">469</span> MiniBatchOperationInProgress<Mutation> miniBatchOp) throws IOException {}<a name="line.469"></a> +<span class="sourceLineNo">470</span><a name="line.470"></a> +<span class="sourceLineNo">471</span> /**<a name="line.471"></a> +<span class="sourceLineNo">472</span> * This will be called for region operations where read lock is acquired in<a name="line.472"></a> +<span class="sourceLineNo">473</span> * {@link Region#startRegionOperation()}.<a name="line.473"></a> +<span class="sourceLineNo">474</span> * @param ctx<a name="line.474"></a> +<span class="sourceLineNo">475</span> * @param operation The operation is about to be taken on the region<a name="line.475"></a> +<span class="sourceLineNo">476</span> */<a name="line.476"></a> +<span class="sourceLineNo">477</span> default void postStartRegionOperation(ObserverContext<RegionCoprocessorEnvironment> ctx,<a name="line.477"></a> +<span class="sourceLineNo">478</span> Operation operation) throws IOException {}<a name="line.478"></a> +<span class="sourceLineNo">479</span><a name="line.479"></a> +<span class="sourceLineNo">480</span> /**<a name="line.480"></a> +<span class="sourceLineNo">481</span> * Called after releasing read lock in {@link Region#closeRegionOperation()}.<a name="line.481"></a> +<span class="sourceLineNo">482</span> * @param ctx<a name="line.482"></a> +<span class="sourceLineNo">483</span> * @param operation<a name="line.483"></a> +<span class="sourceLineNo">484</span> */<a name="line.484"></a> +<span class="sourceLineNo">485</span> default void postCloseRegionOperation(ObserverContext<RegionCoprocessorEnvironment> ctx,<a name="line.485"></a> +<span class="sourceLineNo">486</span> Operation operation) throws IOException {}<a name="line.486"></a> +<span class="sourceLineNo">487</span><a name="line.487"></a> +<span class="sourceLineNo">488</span> /**<a name="line.488"></a> +<span class="sourceLineNo">489</span> * Called after the completion of batch put/delete and will be called even if the batch operation<a name="line.489"></a> +<span class="sourceLineNo">490</span> * fails.<a name="line.490"></a> +<span class="sourceLineNo">491</span> * <p><a name="line.491"></a> +<span class="sourceLineNo">492</span> * Note: Do not retain references to any Cells in Mutations beyond the life of this invocation.<a name="line.492"></a> +<span class="sourceLineNo">493</span> * If need a Cell reference for later use, copy the cell and use that.<a name="line.493"></a> +<span class="sourceLineNo">494</span> * @param ctx<a name="line.494"></a> +<span class="sourceLineNo">495</span> * @param miniBatchOp<a name="line.495"></a> +<span class="sourceLineNo">496</span> * @param success true if batch operation is successful otherwise false.<a name="line.496"></a> +<span class="sourceLineNo">497</span> */<a name="line.497"></a> +<span class="sourceLineNo">498</span> default void postBatchMutateIndispensably(ObserverContext<RegionCoprocessorEnvironment> ctx,<a name="line.498"></a> +<span class="sourceLineNo">499</span> MiniBatchOperationInProgress<Mutation> miniBatchOp, boolean success) throws IOException {}<a
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