http://git-wip-us.apache.org/repos/asf/hbase-site/blob/b7626a4c/devapidocs/src-html/org/apache/hadoop/hbase/replication/regionserver/WALEntryStream.html
----------------------------------------------------------------------
diff --git
a/devapidocs/src-html/org/apache/hadoop/hbase/replication/regionserver/WALEntryStream.html
b/devapidocs/src-html/org/apache/hadoop/hbase/replication/regionserver/WALEntryStream.html
index 745d53a..613d163 100644
---
a/devapidocs/src-html/org/apache/hadoop/hbase/replication/regionserver/WALEntryStream.html
+++
b/devapidocs/src-html/org/apache/hadoop/hbase/replication/regionserver/WALEntryStream.html
@@ -241,190 +241,192 @@
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<span class="sourceLineNo">234</span> if (currentPosition <
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<span class="sourceLineNo">235</span> final long skippedBytes =
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metrics.incrUncleanlyClosedWALs();<a name="line.239"></a>
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metrics.incrBytesSkippedInUncleanlyClosedWALs(skippedBytes);<a
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-<span class="sourceLineNo">242</span> } else if (currentPosition +
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file '" + currentPath + "'. At position " + currentPosition<a
name="line.243"></a>
-<span class="sourceLineNo">244</span> + ", which is too far away
from reported file length " + stat.getLen()<a name="line.244"></a>
-<span class="sourceLineNo">245</span> + ". Restarting WAL reading
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name="line.253"></a>
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+ this.currentPath + ", and the length of the file is "<a name="line.254"></a>
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stat.getLen()));<a name="line.255"></a>
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name="line.257"></a>
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-<span class="sourceLineNo">259</span> }<a name="line.259"></a>
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IOException {<a name="line.261"></a>
-<span class="sourceLineNo">262</span> if (LOG.isDebugEnabled()) {<a
name="line.262"></a>
-<span class="sourceLineNo">263</span> LOG.debug("Reached the end of log "
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name="line.266"></a>
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name="line.268"></a>
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name="line.272"></a>
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metrics.incrLogReadInBytes(readerPos - currentPosition);<a name="line.276"></a>
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-<span class="sourceLineNo">284</span> reader.close();<a
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reader on the next log<a name="line.289"></a>
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FSUtils.getRootDir(conf);<a name="line.308"></a>
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{<a name="line.311"></a>
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moved to " + archivedLogLocation);<a name="line.312"></a>
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name="line.313"></a>
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-<span class="sourceLineNo">331</span> // Detect if this is a new file, if
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-<span class="sourceLineNo">332</span> // reset the current reader so that
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lnre) {<a name="line.347"></a>
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closed due to some hiccup.<a name="line.348"></a>
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lease " + currentPath, lnre);<a name="line.349"></a>
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file before any data node has the most recent block<a name="line.354"></a>
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name="line.355"></a>
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FSUtils.getInstance(dfs, conf);<a name="line.365"></a>
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conf, new CancelableProgressable() {<a name="line.366"></a>
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name="line.368"></a>
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{<a name="line.382"></a>
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cleanly, so we did not parse " + skippedBytes<a name="line.238"></a>
+<span class="sourceLineNo">239</span> + " bytes of data. This
is normally ok.");<a name="line.239"></a>
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+<span class="sourceLineNo">241</span>
metrics.incrUncleanlyClosedWALs();<a name="line.241"></a>
+<span class="sourceLineNo">242</span>
metrics.incrBytesSkippedInUncleanlyClosedWALs(skippedBytes);<a
name="line.242"></a>
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+<span class="sourceLineNo">244</span> } else if (currentPosition +
trailerSize < stat.getLen()) {<a name="line.244"></a>
+<span class="sourceLineNo">245</span> LOG.warn("Processing end of WAL
file '" + currentPath + "'. At position " + currentPosition<a
name="line.245"></a>
+<span class="sourceLineNo">246</span> + ", which is too far away
from reported file length " + stat.getLen()<a name="line.246"></a>
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(see HBASE-15983 for details). " + getCurrentPathStat());<a name="line.247"></a>
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metrics.incrRestartedWALReading();<a name="line.250"></a>
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stat.getLen()));<a name="line.257"></a>
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+<span class="sourceLineNo">271</span> }<a name="line.271"></a>
+<span class="sourceLineNo">272</span><a name="line.272"></a>
+<span class="sourceLineNo">273</span> private void
readNextEntryAndSetPosition() throws IOException {<a name="line.273"></a>
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+<span class="sourceLineNo">278</span>
metrics.incrLogReadInBytes(readerPos - currentPosition);<a name="line.278"></a>
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+<span class="sourceLineNo">281</span> setPosition(readerPos);<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> private void closeReader() throws
IOException {<a name="line.284"></a>
+<span class="sourceLineNo">285</span> if (reader != null) {<a
name="line.285"></a>
+<span class="sourceLineNo">286</span> reader.close();<a
name="line.286"></a>
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name="line.287"></a>
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+<span class="sourceLineNo">289</span> }<a name="line.289"></a>
+<span class="sourceLineNo">290</span><a name="line.290"></a>
+<span class="sourceLineNo">291</span> // if we don't have a reader, open a
reader on the next log<a name="line.291"></a>
+<span class="sourceLineNo">292</span> private boolean checkReader() throws
IOException {<a name="line.292"></a>
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name="line.293"></a>
+<span class="sourceLineNo">294</span> return openNextLog();<a
name="line.294"></a>
+<span class="sourceLineNo">295</span> }<a name="line.295"></a>
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+<span class="sourceLineNo">298</span><a name="line.298"></a>
+<span class="sourceLineNo">299</span> // open a reader on the next log in
queue<a name="line.299"></a>
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IOException {<a name="line.300"></a>
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name="line.301"></a>
+<span class="sourceLineNo">302</span> if (nextPath != null) {<a
name="line.302"></a>
+<span class="sourceLineNo">303</span> openReader(nextPath);<a
name="line.303"></a>
+<span class="sourceLineNo">304</span> if (reader != null) return true;<a
name="line.304"></a>
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+<span class="sourceLineNo">307</span> }<a name="line.307"></a>
+<span class="sourceLineNo">308</span><a name="line.308"></a>
+<span class="sourceLineNo">309</span> private Path getArchivedLog(Path path)
throws IOException {<a name="line.309"></a>
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FSUtils.getRootDir(conf);<a name="line.310"></a>
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HConstants.HREGION_OLDLOGDIR_NAME);<a name="line.311"></a>
+<span class="sourceLineNo">312</span> Path archivedLogLocation = new
Path(oldLogDir, path.getName());<a name="line.312"></a>
+<span class="sourceLineNo">313</span> if (fs.exists(archivedLogLocation))
{<a name="line.313"></a>
+<span class="sourceLineNo">314</span> LOG.info("Log " + path + " was
moved to " + archivedLogLocation);<a name="line.314"></a>
+<span class="sourceLineNo">315</span> return archivedLogLocation;<a
name="line.315"></a>
+<span class="sourceLineNo">316</span> } else {<a name="line.316"></a>
+<span class="sourceLineNo">317</span> LOG.error("Couldn't locate log: " +
path);<a name="line.317"></a>
+<span class="sourceLineNo">318</span> return path;<a name="line.318"></a>
+<span class="sourceLineNo">319</span> }<a name="line.319"></a>
+<span class="sourceLineNo">320</span> }<a name="line.320"></a>
+<span class="sourceLineNo">321</span><a name="line.321"></a>
+<span class="sourceLineNo">322</span> private void handleFileNotFound(Path
path, FileNotFoundException fnfe) throws IOException {<a name="line.322"></a>
+<span class="sourceLineNo">323</span> // If the log was archived, continue
reading from there<a name="line.323"></a>
+<span class="sourceLineNo">324</span> Path archivedLog =
getArchivedLog(path);<a name="line.324"></a>
+<span class="sourceLineNo">325</span> if (!path.equals(archivedLog)) {<a
name="line.325"></a>
+<span class="sourceLineNo">326</span> openReader(archivedLog);<a
name="line.326"></a>
+<span class="sourceLineNo">327</span> } else {<a name="line.327"></a>
+<span class="sourceLineNo">328</span> throw fnfe;<a name="line.328"></a>
+<span class="sourceLineNo">329</span> }<a name="line.329"></a>
+<span class="sourceLineNo">330</span> }<a name="line.330"></a>
+<span class="sourceLineNo">331</span> private void openReader(Path path)
throws IOException {<a name="line.331"></a>
+<span class="sourceLineNo">332</span> try {<a name="line.332"></a>
+<span class="sourceLineNo">333</span> // Detect if this is a new file, if
so get a new reader else<a name="line.333"></a>
+<span class="sourceLineNo">334</span> // reset the current reader so that
we see the new data<a name="line.334"></a>
+<span class="sourceLineNo">335</span> if (reader == null ||
!getCurrentPath().equals(path)) {<a name="line.335"></a>
+<span class="sourceLineNo">336</span> closeReader();<a
name="line.336"></a>
+<span class="sourceLineNo">337</span> reader =
WALFactory.createReader(fs, path, conf);<a name="line.337"></a>
+<span class="sourceLineNo">338</span> seek();<a name="line.338"></a>
+<span class="sourceLineNo">339</span> setCurrentPath(path);<a
name="line.339"></a>
+<span class="sourceLineNo">340</span> } else {<a name="line.340"></a>
+<span class="sourceLineNo">341</span> resetReader();<a
name="line.341"></a>
+<span class="sourceLineNo">342</span> }<a name="line.342"></a>
+<span class="sourceLineNo">343</span> } catch (FileNotFoundException fnfe)
{<a name="line.343"></a>
+<span class="sourceLineNo">344</span> handleFileNotFound(path, fnfe);<a
name="line.344"></a>
+<span class="sourceLineNo">345</span> } catch (RemoteException re) {<a
name="line.345"></a>
+<span class="sourceLineNo">346</span> IOException ioe =
re.unwrapRemoteException(FileNotFoundException.class);<a name="line.346"></a>
+<span class="sourceLineNo">347</span> if (!(ioe instanceof
FileNotFoundException)) throw ioe;<a name="line.347"></a>
+<span class="sourceLineNo">348</span> handleFileNotFound(path,
(FileNotFoundException)ioe);<a name="line.348"></a>
+<span class="sourceLineNo">349</span> } catch (LeaseNotRecoveredException
lnre) {<a name="line.349"></a>
+<span class="sourceLineNo">350</span> // HBASE-15019 the WAL was not
closed due to some hiccup.<a name="line.350"></a>
+<span class="sourceLineNo">351</span> LOG.warn("Try to recover the WAL
lease " + currentPath, lnre);<a name="line.351"></a>
+<span class="sourceLineNo">352</span> recoverLease(conf, currentPath);<a
name="line.352"></a>
+<span class="sourceLineNo">353</span> reader = null;<a
name="line.353"></a>
+<span class="sourceLineNo">354</span> } catch (NullPointerException npe)
{<a name="line.354"></a>
+<span class="sourceLineNo">355</span> // Workaround for race condition in
HDFS-4380<a name="line.355"></a>
+<span class="sourceLineNo">356</span> // which throws a NPE if we open a
file before any data node has the most recent block<a name="line.356"></a>
+<span class="sourceLineNo">357</span> // Just sleep and retry. Will
require re-reading compressed WALs for compressionContext.<a
name="line.357"></a>
+<span class="sourceLineNo">358</span> LOG.warn("Got NPE opening reader,
will retry.");<a name="line.358"></a>
+<span class="sourceLineNo">359</span> reader = null;<a
name="line.359"></a>
+<span class="sourceLineNo">360</span> }<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> // For HBASE-15019<a
name="line.363"></a>
+<span class="sourceLineNo">364</span> private void recoverLease(final
Configuration conf, final Path path) {<a name="line.364"></a>
+<span class="sourceLineNo">365</span> try {<a name="line.365"></a>
+<span class="sourceLineNo">366</span> final FileSystem dfs =
FSUtils.getCurrentFileSystem(conf);<a name="line.366"></a>
+<span class="sourceLineNo">367</span> FSUtils fsUtils =
FSUtils.getInstance(dfs, conf);<a name="line.367"></a>
+<span class="sourceLineNo">368</span> fsUtils.recoverFileLease(dfs, path,
conf, new CancelableProgressable() {<a name="line.368"></a>
+<span class="sourceLineNo">369</span> @Override<a name="line.369"></a>
+<span class="sourceLineNo">370</span> public boolean progress() {<a
name="line.370"></a>
+<span class="sourceLineNo">371</span> LOG.debug("recover WAL lease: "
+ path);<a name="line.371"></a>
+<span class="sourceLineNo">372</span> return true;<a
name="line.372"></a>
+<span class="sourceLineNo">373</span> }<a name="line.373"></a>
+<span class="sourceLineNo">374</span> });<a name="line.374"></a>
+<span class="sourceLineNo">375</span> } catch (IOException e) {<a
name="line.375"></a>
+<span class="sourceLineNo">376</span> LOG.warn("unable to recover lease
for WAL: " + path, e);<a name="line.376"></a>
+<span class="sourceLineNo">377</span> }<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> private void resetReader() throws
IOException {<a name="line.380"></a>
+<span class="sourceLineNo">381</span> try {<a name="line.381"></a>
+<span class="sourceLineNo">382</span> reader.reset();<a
name="line.382"></a>
+<span class="sourceLineNo">383</span> seek();<a name="line.383"></a>
+<span class="sourceLineNo">384</span> } catch (FileNotFoundException fnfe)
{<a name="line.384"></a>
+<span class="sourceLineNo">385</span> // If the log was archived,
continue reading from there<a name="line.385"></a>
+<span class="sourceLineNo">386</span> Path archivedLog =
getArchivedLog(currentPath);<a name="line.386"></a>
+<span class="sourceLineNo">387</span> if
(!currentPath.equals(archivedLog)) {<a name="line.387"></a>
+<span class="sourceLineNo">388</span> openReader(archivedLog);<a
name="line.388"></a>
+<span class="sourceLineNo">389</span> } else {<a name="line.389"></a>
+<span class="sourceLineNo">390</span> throw fnfe;<a name="line.390"></a>
+<span class="sourceLineNo">391</span> }<a name="line.391"></a>
+<span class="sourceLineNo">392</span> } catch (NullPointerException npe)
{<a name="line.392"></a>
+<span class="sourceLineNo">393</span> throw new IOException("NPE
resetting reader, likely HDFS-4380", npe);<a name="line.393"></a>
+<span class="sourceLineNo">394</span> }<a name="line.394"></a>
+<span class="sourceLineNo">395</span> }<a name="line.395"></a>
+<span class="sourceLineNo">396</span><a name="line.396"></a>
+<span class="sourceLineNo">397</span> private void seek() throws IOException
{<a name="line.397"></a>
+<span class="sourceLineNo">398</span> if (currentPosition != 0) {<a
name="line.398"></a>
+<span class="sourceLineNo">399</span> reader.seek(currentPosition);<a
name="line.399"></a>
+<span class="sourceLineNo">400</span> }<a name="line.400"></a>
+<span class="sourceLineNo">401</span> }<a name="line.401"></a>
+<span class="sourceLineNo">402</span><a name="line.402"></a>
+<span class="sourceLineNo">403</span> private long currentTrailerSize() {<a
name="line.403"></a>
+<span class="sourceLineNo">404</span> long size = -1L;<a
name="line.404"></a>
+<span class="sourceLineNo">405</span> if (reader instanceof
ProtobufLogReader) {<a name="line.405"></a>
+<span class="sourceLineNo">406</span> final ProtobufLogReader pblr =
(ProtobufLogReader) reader;<a name="line.406"></a>
+<span class="sourceLineNo">407</span> size = pblr.trailerSize();<a
name="line.407"></a>
+<span class="sourceLineNo">408</span> }<a name="line.408"></a>
+<span class="sourceLineNo">409</span> return size;<a name="line.409"></a>
+<span class="sourceLineNo">410</span> }<a name="line.410"></a>
+<span class="sourceLineNo">411</span><a name="line.411"></a>
+<span class="sourceLineNo">412</span> @InterfaceAudience.Private<a
name="line.412"></a>
+<span class="sourceLineNo">413</span> public static class
WALEntryStreamRuntimeException extends RuntimeException {<a name="line.413"></a>
+<span class="sourceLineNo">414</span> private static final long
serialVersionUID = -6298201811259982568L;<a name="line.414"></a>
+<span class="sourceLineNo">415</span><a name="line.415"></a>
+<span class="sourceLineNo">416</span> public
WALEntryStreamRuntimeException(Exception e) {<a name="line.416"></a>
+<span class="sourceLineNo">417</span> super(e);<a name="line.417"></a>
+<span class="sourceLineNo">418</span> }<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>}<a name="line.421"></a>
