http://git-wip-us.apache.org/repos/asf/hbase-site/blob/f07ee53f/apidocs/src-html/org/apache/hadoop/hbase/client/Query.html ---------------------------------------------------------------------- diff --git a/apidocs/src-html/org/apache/hadoop/hbase/client/Query.html b/apidocs/src-html/org/apache/hadoop/hbase/client/Query.html index 417e13a..13eb321 100644 --- a/apidocs/src-html/org/apache/hadoop/hbase/client/Query.html +++ b/apidocs/src-html/org/apache/hadoop/hbase/client/Query.html @@ -52,7 +52,7 @@ <span class="sourceLineNo">044</span> protected int targetReplicaId = -1;<a name="line.44"></a> <span class="sourceLineNo">045</span> protected Consistency consistency = Consistency.STRONG;<a name="line.45"></a> <span class="sourceLineNo">046</span> protected Map<byte[], TimeRange> colFamTimeRangeMap = Maps.newTreeMap(Bytes.BYTES_COMPARATOR);<a name="line.46"></a> -<span class="sourceLineNo">047</span><a name="line.47"></a> +<span class="sourceLineNo">047</span> protected Boolean loadColumnFamiliesOnDemand = null;<a name="line.47"></a> <span class="sourceLineNo">048</span> /**<a name="line.48"></a> <span class="sourceLineNo">049</span> * @return Filter<a name="line.49"></a> <span class="sourceLineNo">050</span> */<a name="line.50"></a> @@ -187,32 +187,67 @@ <span class="sourceLineNo">179</span> IsolationLevel.fromBytes(attr);<a name="line.179"></a> <span class="sourceLineNo">180</span> }<a name="line.180"></a> <span class="sourceLineNo">181</span><a name="line.181"></a> -<span class="sourceLineNo">182</span><a name="line.182"></a> -<span class="sourceLineNo">183</span> /**<a name="line.183"></a> -<span class="sourceLineNo">184</span> * Get versions of columns only within the specified timestamp range,<a name="line.184"></a> -<span class="sourceLineNo">185</span> * [minStamp, maxStamp) on a per CF bases. Note, default maximum versions to return is 1. If<a name="line.185"></a> -<span class="sourceLineNo">186</span> * your time range spans more than one version and you want all versions<a name="line.186"></a> -<span class="sourceLineNo">187</span> * returned, up the number of versions beyond the default.<a name="line.187"></a> -<span class="sourceLineNo">188</span> * Column Family time ranges take precedence over the global time range.<a name="line.188"></a> -<span class="sourceLineNo">189</span> *<a name="line.189"></a> -<span class="sourceLineNo">190</span> * @param cf the column family for which you want to restrict<a name="line.190"></a> -<span class="sourceLineNo">191</span> * @param minStamp minimum timestamp value, inclusive<a name="line.191"></a> -<span class="sourceLineNo">192</span> * @param maxStamp maximum timestamp value, exclusive<a name="line.192"></a> -<span class="sourceLineNo">193</span> * @return this<a name="line.193"></a> -<span class="sourceLineNo">194</span> */<a name="line.194"></a> -<span class="sourceLineNo">195</span><a name="line.195"></a> -<span class="sourceLineNo">196</span> public Query setColumnFamilyTimeRange(byte[] cf, long minStamp, long maxStamp) {<a name="line.196"></a> -<span class="sourceLineNo">197</span> colFamTimeRangeMap.put(cf, new TimeRange(minStamp, maxStamp));<a name="line.197"></a> -<span class="sourceLineNo">198</span> return this;<a name="line.198"></a> -<span class="sourceLineNo">199</span> }<a name="line.199"></a> -<span class="sourceLineNo">200</span><a name="line.200"></a> -<span class="sourceLineNo">201</span> /**<a name="line.201"></a> -<span class="sourceLineNo">202</span> * @return A map of column families to time ranges<a name="line.202"></a> -<span class="sourceLineNo">203</span> */<a name="line.203"></a> -<span class="sourceLineNo">204</span> public Map<byte[], TimeRange> getColumnFamilyTimeRange() {<a name="line.204"></a> -<span class="sourceLineNo">205</span> return this.colFamTimeRangeMap;<a name="line.205"></a> -<span class="sourceLineNo">206</span> }<a name="line.206"></a> -<span class="sourceLineNo">207</span>}<a name="line.207"></a> +<span class="sourceLineNo">182</span> /**<a name="line.182"></a> +<span class="sourceLineNo">183</span> * Set the value indicating whether loading CFs on demand should be allowed (cluster<a name="line.183"></a> +<span class="sourceLineNo">184</span> * default is false). On-demand CF loading doesn't load column families until necessary, e.g.<a name="line.184"></a> +<span class="sourceLineNo">185</span> * if you filter on one column, the other column family data will be loaded only for the rows<a name="line.185"></a> +<span class="sourceLineNo">186</span> * that are included in result, not all rows like in normal case.<a name="line.186"></a> +<span class="sourceLineNo">187</span> * With column-specific filters, like SingleColumnValueFilter w/filterIfMissing == true,<a name="line.187"></a> +<span class="sourceLineNo">188</span> * this can deliver huge perf gains when there's a cf with lots of data; however, it can<a name="line.188"></a> +<span class="sourceLineNo">189</span> * also lead to some inconsistent results, as follows:<a name="line.189"></a> +<span class="sourceLineNo">190</span> * - if someone does a concurrent update to both column families in question you may get a row<a name="line.190"></a> +<span class="sourceLineNo">191</span> * that never existed, e.g. for { rowKey = 5, { cat_videos =&gt; 1 }, { video =&gt; "my cat" } }<a name="line.191"></a> +<span class="sourceLineNo">192</span> * someone puts rowKey 5 with { cat_videos =&gt; 0 }, { video =&gt; "my dog" }, concurrent scan<a name="line.192"></a> +<span class="sourceLineNo">193</span> * filtering on "cat_videos == 1" can get { rowKey = 5, { cat_videos =&gt; 1 },<a name="line.193"></a> +<span class="sourceLineNo">194</span> * { video =&gt; "my dog" } }.<a name="line.194"></a> +<span class="sourceLineNo">195</span> * - if there's a concurrent split and you have more than 2 column families, some rows may be<a name="line.195"></a> +<span class="sourceLineNo">196</span> * missing some column families.<a name="line.196"></a> +<span class="sourceLineNo">197</span> */<a name="line.197"></a> +<span class="sourceLineNo">198</span> public Query setLoadColumnFamiliesOnDemand(boolean value) {<a name="line.198"></a> +<span class="sourceLineNo">199</span> this.loadColumnFamiliesOnDemand = value;<a name="line.199"></a> +<span class="sourceLineNo">200</span> return this;<a name="line.200"></a> +<span class="sourceLineNo">201</span> }<a name="line.201"></a> +<span class="sourceLineNo">202</span><a name="line.202"></a> +<span class="sourceLineNo">203</span> /**<a name="line.203"></a> +<span class="sourceLineNo">204</span> * Get the raw loadColumnFamiliesOnDemand setting; if it's not set, can be null.<a name="line.204"></a> +<span class="sourceLineNo">205</span> */<a name="line.205"></a> +<span class="sourceLineNo">206</span> public Boolean getLoadColumnFamiliesOnDemandValue() {<a name="line.206"></a> +<span class="sourceLineNo">207</span> return this.loadColumnFamiliesOnDemand;<a name="line.207"></a> +<span class="sourceLineNo">208</span> }<a name="line.208"></a> +<span class="sourceLineNo">209</span><a name="line.209"></a> +<span class="sourceLineNo">210</span> /**<a name="line.210"></a> +<span class="sourceLineNo">211</span> * Get the logical value indicating whether on-demand CF loading should be allowed.<a name="line.211"></a> +<span class="sourceLineNo">212</span> */<a name="line.212"></a> +<span class="sourceLineNo">213</span> public boolean doLoadColumnFamiliesOnDemand() {<a name="line.213"></a> +<span class="sourceLineNo">214</span> return (this.loadColumnFamiliesOnDemand != null)<a name="line.214"></a> +<span class="sourceLineNo">215</span> && this.loadColumnFamiliesOnDemand;<a name="line.215"></a> +<span class="sourceLineNo">216</span> }<a name="line.216"></a> +<span class="sourceLineNo">217</span><a name="line.217"></a> +<span class="sourceLineNo">218</span> /**<a name="line.218"></a> +<span class="sourceLineNo">219</span> * Get versions of columns only within the specified timestamp range,<a name="line.219"></a> +<span class="sourceLineNo">220</span> * [minStamp, maxStamp) on a per CF bases. Note, default maximum versions to return is 1. If<a name="line.220"></a> +<span class="sourceLineNo">221</span> * your time range spans more than one version and you want all versions<a name="line.221"></a> +<span class="sourceLineNo">222</span> * returned, up the number of versions beyond the default.<a name="line.222"></a> +<span class="sourceLineNo">223</span> * Column Family time ranges take precedence over the global time range.<a name="line.223"></a> +<span class="sourceLineNo">224</span> *<a name="line.224"></a> +<span class="sourceLineNo">225</span> * @param cf the column family for which you want to restrict<a name="line.225"></a> +<span class="sourceLineNo">226</span> * @param minStamp minimum timestamp value, inclusive<a name="line.226"></a> +<span class="sourceLineNo">227</span> * @param maxStamp maximum timestamp value, exclusive<a name="line.227"></a> +<span class="sourceLineNo">228</span> * @return this<a name="line.228"></a> +<span class="sourceLineNo">229</span> */<a name="line.229"></a> +<span class="sourceLineNo">230</span><a name="line.230"></a> +<span class="sourceLineNo">231</span> public Query setColumnFamilyTimeRange(byte[] cf, long minStamp, long maxStamp) {<a name="line.231"></a> +<span class="sourceLineNo">232</span> colFamTimeRangeMap.put(cf, new TimeRange(minStamp, maxStamp));<a name="line.232"></a> +<span class="sourceLineNo">233</span> return this;<a name="line.233"></a> +<span class="sourceLineNo">234</span> }<a name="line.234"></a> +<span class="sourceLineNo">235</span><a name="line.235"></a> +<span class="sourceLineNo">236</span> /**<a name="line.236"></a> +<span class="sourceLineNo">237</span> * @return A map of column families to time ranges<a name="line.237"></a> +<span class="sourceLineNo">238</span> */<a name="line.238"></a> +<span class="sourceLineNo">239</span> public Map<byte[], TimeRange> getColumnFamilyTimeRange() {<a name="line.239"></a> +<span class="sourceLineNo">240</span> return this.colFamTimeRangeMap;<a name="line.240"></a> +<span class="sourceLineNo">241</span> }<a name="line.241"></a> +<span class="sourceLineNo">242</span>}<a name="line.242"></a>
http://git-wip-us.apache.org/repos/asf/hbase-site/blob/f07ee53f/apidocs/src-html/org/apache/hadoop/hbase/client/Scan.html ---------------------------------------------------------------------- diff --git a/apidocs/src-html/org/apache/hadoop/hbase/client/Scan.html b/apidocs/src-html/org/apache/hadoop/hbase/client/Scan.html index 274255a..67d3a00 100644 --- a/apidocs/src-html/org/apache/hadoop/hbase/client/Scan.html +++ b/apidocs/src-html/org/apache/hadoop/hbase/client/Scan.html @@ -145,142 +145,142 @@ <span class="sourceLineNo">137</span> private TimeRange tr = new TimeRange();<a name="line.137"></a> <span class="sourceLineNo">138</span> private Map<byte [], NavigableSet<byte []>> familyMap =<a name="line.138"></a> <span class="sourceLineNo">139</span> new TreeMap<byte [], NavigableSet<byte []>>(Bytes.BYTES_COMPARATOR);<a name="line.139"></a> -<span class="sourceLineNo">140</span> private Boolean loadColumnFamiliesOnDemand = null;<a name="line.140"></a> -<span class="sourceLineNo">141</span> private Boolean asyncPrefetch = null;<a name="line.141"></a> -<span class="sourceLineNo">142</span><a name="line.142"></a> -<span class="sourceLineNo">143</span> /**<a name="line.143"></a> -<span class="sourceLineNo">144</span> * Parameter name for client scanner sync/async prefetch toggle.<a name="line.144"></a> -<span class="sourceLineNo">145</span> * When using async scanner, prefetching data from the server is done at the background.<a name="line.145"></a> -<span class="sourceLineNo">146</span> * The parameter currently won't have any effect in the case that the user has set<a name="line.146"></a> -<span class="sourceLineNo">147</span> * Scan#setSmall or Scan#setReversed<a name="line.147"></a> -<span class="sourceLineNo">148</span> */<a name="line.148"></a> -<span class="sourceLineNo">149</span> public static final String HBASE_CLIENT_SCANNER_ASYNC_PREFETCH =<a name="line.149"></a> -<span class="sourceLineNo">150</span> "hbase.client.scanner.async.prefetch";<a name="line.150"></a> -<span class="sourceLineNo">151</span><a name="line.151"></a> -<span class="sourceLineNo">152</span> /**<a name="line.152"></a> -<span class="sourceLineNo">153</span> * Default value of {@link #HBASE_CLIENT_SCANNER_ASYNC_PREFETCH}.<a name="line.153"></a> -<span class="sourceLineNo">154</span> */<a name="line.154"></a> -<span class="sourceLineNo">155</span> public static final boolean DEFAULT_HBASE_CLIENT_SCANNER_ASYNC_PREFETCH = false;<a name="line.155"></a> -<span class="sourceLineNo">156</span><a name="line.156"></a> -<span class="sourceLineNo">157</span> /**<a name="line.157"></a> -<span class="sourceLineNo">158</span> * Set it true for small scan to get better performance<a name="line.158"></a> -<span class="sourceLineNo">159</span> *<a name="line.159"></a> -<span class="sourceLineNo">160</span> * Small scan should use pread and big scan can use seek + read<a name="line.160"></a> -<span class="sourceLineNo">161</span> *<a name="line.161"></a> -<span class="sourceLineNo">162</span> * seek + read is fast but can cause two problem (1) resource contention (2)<a name="line.162"></a> -<span class="sourceLineNo">163</span> * cause too much network io<a name="line.163"></a> -<span class="sourceLineNo">164</span> *<a name="line.164"></a> -<span class="sourceLineNo">165</span> * [89-fb] Using pread for non-compaction read request<a name="line.165"></a> -<span class="sourceLineNo">166</span> * https://issues.apache.org/jira/browse/HBASE-7266<a name="line.166"></a> -<span class="sourceLineNo">167</span> *<a name="line.167"></a> -<span class="sourceLineNo">168</span> * On the other hand, if setting it true, we would do<a name="line.168"></a> -<span class="sourceLineNo">169</span> * openScanner,next,closeScanner in one RPC call. It means the better<a name="line.169"></a> -<span class="sourceLineNo">170</span> * performance for small scan. [HBASE-9488].<a name="line.170"></a> -<span class="sourceLineNo">171</span> *<a name="line.171"></a> -<span class="sourceLineNo">172</span> * Generally, if the scan range is within one data block(64KB), it could be<a name="line.172"></a> -<span class="sourceLineNo">173</span> * considered as a small scan.<a name="line.173"></a> -<span class="sourceLineNo">174</span> */<a name="line.174"></a> -<span class="sourceLineNo">175</span> private boolean small = false;<a name="line.175"></a> -<span class="sourceLineNo">176</span><a name="line.176"></a> -<span class="sourceLineNo">177</span> /**<a name="line.177"></a> -<span class="sourceLineNo">178</span> * Create a Scan operation across all rows.<a name="line.178"></a> -<span class="sourceLineNo">179</span> */<a name="line.179"></a> -<span class="sourceLineNo">180</span> public Scan() {}<a name="line.180"></a> -<span class="sourceLineNo">181</span><a name="line.181"></a> -<span class="sourceLineNo">182</span> public Scan(byte [] startRow, Filter filter) {<a name="line.182"></a> -<span class="sourceLineNo">183</span> this(startRow);<a name="line.183"></a> -<span class="sourceLineNo">184</span> this.filter = filter;<a name="line.184"></a> -<span class="sourceLineNo">185</span> }<a name="line.185"></a> -<span class="sourceLineNo">186</span><a name="line.186"></a> -<span class="sourceLineNo">187</span> /**<a name="line.187"></a> -<span class="sourceLineNo">188</span> * Create a Scan operation starting at the specified row.<a name="line.188"></a> -<span class="sourceLineNo">189</span> * <p><a name="line.189"></a> -<span class="sourceLineNo">190</span> * If the specified row does not exist, the Scanner will start from the<a name="line.190"></a> -<span class="sourceLineNo">191</span> * next closest row after the specified row.<a name="line.191"></a> -<span class="sourceLineNo">192</span> * @param startRow row to start scanner at or after<a name="line.192"></a> -<span class="sourceLineNo">193</span> */<a name="line.193"></a> -<span class="sourceLineNo">194</span> public Scan(byte [] startRow) {<a name="line.194"></a> -<span class="sourceLineNo">195</span> this.startRow = startRow;<a name="line.195"></a> -<span class="sourceLineNo">196</span> }<a name="line.196"></a> -<span class="sourceLineNo">197</span><a name="line.197"></a> -<span class="sourceLineNo">198</span> /**<a name="line.198"></a> -<span class="sourceLineNo">199</span> * Create a Scan operation for the range of rows specified.<a name="line.199"></a> -<span class="sourceLineNo">200</span> * @param startRow row to start scanner at or after (inclusive)<a name="line.200"></a> -<span class="sourceLineNo">201</span> * @param stopRow row to stop scanner before (exclusive)<a name="line.201"></a> -<span class="sourceLineNo">202</span> */<a name="line.202"></a> -<span class="sourceLineNo">203</span> public Scan(byte [] startRow, byte [] stopRow) {<a name="line.203"></a> -<span class="sourceLineNo">204</span> this.startRow = startRow;<a name="line.204"></a> -<span class="sourceLineNo">205</span> this.stopRow = stopRow;<a name="line.205"></a> -<span class="sourceLineNo">206</span> //if the startRow and stopRow both are empty, it is not a Get<a name="line.206"></a> -<span class="sourceLineNo">207</span> this.getScan = isStartRowAndEqualsStopRow();<a name="line.207"></a> -<span class="sourceLineNo">208</span> }<a name="line.208"></a> -<span class="sourceLineNo">209</span><a name="line.209"></a> -<span class="sourceLineNo">210</span> /**<a name="line.210"></a> -<span class="sourceLineNo">211</span> * Creates a new instance of this class while copying all values.<a name="line.211"></a> -<span class="sourceLineNo">212</span> *<a name="line.212"></a> -<span class="sourceLineNo">213</span> * @param scan The scan instance to copy from.<a name="line.213"></a> -<span class="sourceLineNo">214</span> * @throws IOException When copying the values fails.<a name="line.214"></a> -<span class="sourceLineNo">215</span> */<a name="line.215"></a> -<span class="sourceLineNo">216</span> public Scan(Scan scan) throws IOException {<a name="line.216"></a> -<span class="sourceLineNo">217</span> startRow = scan.getStartRow();<a name="line.217"></a> -<span class="sourceLineNo">218</span> stopRow = scan.getStopRow();<a name="line.218"></a> -<span class="sourceLineNo">219</span> maxVersions = scan.getMaxVersions();<a name="line.219"></a> -<span class="sourceLineNo">220</span> batch = scan.getBatch();<a name="line.220"></a> -<span class="sourceLineNo">221</span> storeLimit = scan.getMaxResultsPerColumnFamily();<a name="line.221"></a> -<span class="sourceLineNo">222</span> storeOffset = scan.getRowOffsetPerColumnFamily();<a name="line.222"></a> -<span class="sourceLineNo">223</span> caching = scan.getCaching();<a name="line.223"></a> -<span class="sourceLineNo">224</span> maxResultSize = scan.getMaxResultSize();<a name="line.224"></a> -<span class="sourceLineNo">225</span> cacheBlocks = scan.getCacheBlocks();<a name="line.225"></a> -<span class="sourceLineNo">226</span> getScan = scan.isGetScan();<a name="line.226"></a> -<span class="sourceLineNo">227</span> filter = scan.getFilter(); // clone?<a name="line.227"></a> -<span class="sourceLineNo">228</span> loadColumnFamiliesOnDemand = scan.getLoadColumnFamiliesOnDemandValue();<a name="line.228"></a> -<span class="sourceLineNo">229</span> consistency = scan.getConsistency();<a name="line.229"></a> -<span class="sourceLineNo">230</span> this.setIsolationLevel(scan.getIsolationLevel());<a name="line.230"></a> -<span class="sourceLineNo">231</span> reversed = scan.isReversed();<a name="line.231"></a> -<span class="sourceLineNo">232</span> asyncPrefetch = scan.isAsyncPrefetch();<a name="line.232"></a> -<span class="sourceLineNo">233</span> small = scan.isSmall();<a name="line.233"></a> -<span class="sourceLineNo">234</span> allowPartialResults = scan.getAllowPartialResults();<a name="line.234"></a> -<span class="sourceLineNo">235</span> TimeRange ctr = scan.getTimeRange();<a name="line.235"></a> -<span class="sourceLineNo">236</span> tr = new TimeRange(ctr.getMin(), ctr.getMax());<a name="line.236"></a> -<span class="sourceLineNo">237</span> Map<byte[], NavigableSet<byte[]>> fams = scan.getFamilyMap();<a name="line.237"></a> -<span class="sourceLineNo">238</span> for (Map.Entry<byte[],NavigableSet<byte[]>> entry : fams.entrySet()) {<a name="line.238"></a> -<span class="sourceLineNo">239</span> byte [] fam = entry.getKey();<a name="line.239"></a> -<span class="sourceLineNo">240</span> NavigableSet<byte[]> cols = entry.getValue();<a name="line.240"></a> -<span class="sourceLineNo">241</span> if (cols != null && cols.size() > 0) {<a name="line.241"></a> -<span class="sourceLineNo">242</span> for (byte[] col : cols) {<a name="line.242"></a> -<span class="sourceLineNo">243</span> addColumn(fam, col);<a name="line.243"></a> -<span class="sourceLineNo">244</span> }<a name="line.244"></a> -<span class="sourceLineNo">245</span> } else {<a name="line.245"></a> -<span class="sourceLineNo">246</span> addFamily(fam);<a name="line.246"></a> -<span class="sourceLineNo">247</span> }<a name="line.247"></a> -<span class="sourceLineNo">248</span> }<a name="line.248"></a> -<span class="sourceLineNo">249</span> for (Map.Entry<String, byte[]> attr : scan.getAttributesMap().entrySet()) {<a name="line.249"></a> -<span class="sourceLineNo">250</span> setAttribute(attr.getKey(), attr.getValue());<a name="line.250"></a> -<span class="sourceLineNo">251</span> }<a name="line.251"></a> -<span class="sourceLineNo">252</span> for (Map.Entry<byte[], TimeRange> entry : scan.getColumnFamilyTimeRange().entrySet()) {<a name="line.252"></a> -<span class="sourceLineNo">253</span> TimeRange tr = entry.getValue();<a name="line.253"></a> -<span class="sourceLineNo">254</span> setColumnFamilyTimeRange(entry.getKey(), tr.getMin(), tr.getMax());<a name="line.254"></a> -<span class="sourceLineNo">255</span> }<a name="line.255"></a> -<span class="sourceLineNo">256</span> }<a name="line.256"></a> -<span class="sourceLineNo">257</span><a name="line.257"></a> -<span class="sourceLineNo">258</span> /**<a name="line.258"></a> -<span class="sourceLineNo">259</span> * Builds a scan object with the same specs as get.<a name="line.259"></a> -<span class="sourceLineNo">260</span> * @param get get to model scan after<a name="line.260"></a> -<span class="sourceLineNo">261</span> */<a name="line.261"></a> -<span class="sourceLineNo">262</span> public Scan(Get get) {<a name="line.262"></a> -<span class="sourceLineNo">263</span> this.startRow = get.getRow();<a name="line.263"></a> -<span class="sourceLineNo">264</span> this.stopRow = get.getRow();<a name="line.264"></a> -<span class="sourceLineNo">265</span> this.filter = get.getFilter();<a name="line.265"></a> -<span class="sourceLineNo">266</span> this.cacheBlocks = get.getCacheBlocks();<a name="line.266"></a> -<span class="sourceLineNo">267</span> this.maxVersions = get.getMaxVersions();<a name="line.267"></a> -<span class="sourceLineNo">268</span> this.storeLimit = get.getMaxResultsPerColumnFamily();<a name="line.268"></a> -<span class="sourceLineNo">269</span> this.storeOffset = get.getRowOffsetPerColumnFamily();<a name="line.269"></a> -<span class="sourceLineNo">270</span> this.tr = get.getTimeRange();<a name="line.270"></a> -<span class="sourceLineNo">271</span> this.familyMap = get.getFamilyMap();<a name="line.271"></a> -<span class="sourceLineNo">272</span> this.getScan = true;<a name="line.272"></a> -<span class="sourceLineNo">273</span> this.asyncPrefetch = false;<a name="line.273"></a> -<span class="sourceLineNo">274</span> this.consistency = get.getConsistency();<a name="line.274"></a> -<span class="sourceLineNo">275</span> this.setIsolationLevel(get.getIsolationLevel());<a name="line.275"></a> +<span class="sourceLineNo">140</span> private Boolean asyncPrefetch = null;<a name="line.140"></a> +<span class="sourceLineNo">141</span><a name="line.141"></a> +<span class="sourceLineNo">142</span> /**<a name="line.142"></a> +<span class="sourceLineNo">143</span> * Parameter name for client scanner sync/async prefetch toggle.<a name="line.143"></a> +<span class="sourceLineNo">144</span> * When using async scanner, prefetching data from the server is done at the background.<a name="line.144"></a> +<span class="sourceLineNo">145</span> * The parameter currently won't have any effect in the case that the user has set<a name="line.145"></a> +<span class="sourceLineNo">146</span> * Scan#setSmall or Scan#setReversed<a name="line.146"></a> +<span class="sourceLineNo">147</span> */<a name="line.147"></a> +<span class="sourceLineNo">148</span> public static final String HBASE_CLIENT_SCANNER_ASYNC_PREFETCH =<a name="line.148"></a> +<span class="sourceLineNo">149</span> "hbase.client.scanner.async.prefetch";<a name="line.149"></a> +<span class="sourceLineNo">150</span><a name="line.150"></a> +<span class="sourceLineNo">151</span> /**<a name="line.151"></a> +<span class="sourceLineNo">152</span> * Default value of {@link #HBASE_CLIENT_SCANNER_ASYNC_PREFETCH}.<a name="line.152"></a> +<span class="sourceLineNo">153</span> */<a name="line.153"></a> +<span class="sourceLineNo">154</span> public static final boolean DEFAULT_HBASE_CLIENT_SCANNER_ASYNC_PREFETCH = false;<a name="line.154"></a> +<span class="sourceLineNo">155</span><a name="line.155"></a> +<span class="sourceLineNo">156</span> /**<a name="line.156"></a> +<span class="sourceLineNo">157</span> * Set it true for small scan to get better performance<a name="line.157"></a> +<span class="sourceLineNo">158</span> *<a name="line.158"></a> +<span class="sourceLineNo">159</span> * Small scan should use pread and big scan can use seek + read<a name="line.159"></a> +<span class="sourceLineNo">160</span> *<a name="line.160"></a> +<span class="sourceLineNo">161</span> * seek + read is fast but can cause two problem (1) resource contention (2)<a name="line.161"></a> +<span class="sourceLineNo">162</span> * cause too much network io<a name="line.162"></a> +<span class="sourceLineNo">163</span> *<a name="line.163"></a> +<span class="sourceLineNo">164</span> * [89-fb] Using pread for non-compaction read request<a name="line.164"></a> +<span class="sourceLineNo">165</span> * https://issues.apache.org/jira/browse/HBASE-7266<a name="line.165"></a> +<span class="sourceLineNo">166</span> *<a name="line.166"></a> +<span class="sourceLineNo">167</span> * On the other hand, if setting it true, we would do<a name="line.167"></a> +<span class="sourceLineNo">168</span> * openScanner,next,closeScanner in one RPC call. It means the better<a name="line.168"></a> +<span class="sourceLineNo">169</span> * performance for small scan. [HBASE-9488].<a name="line.169"></a> +<span class="sourceLineNo">170</span> *<a name="line.170"></a> +<span class="sourceLineNo">171</span> * Generally, if the scan range is within one data block(64KB), it could be<a name="line.171"></a> +<span class="sourceLineNo">172</span> * considered as a small scan.<a name="line.172"></a> +<span class="sourceLineNo">173</span> */<a name="line.173"></a> +<span class="sourceLineNo">174</span> private boolean small = false;<a name="line.174"></a> +<span class="sourceLineNo">175</span><a name="line.175"></a> +<span class="sourceLineNo">176</span> /**<a name="line.176"></a> +<span class="sourceLineNo">177</span> * Create a Scan operation across all rows.<a name="line.177"></a> +<span class="sourceLineNo">178</span> */<a name="line.178"></a> +<span class="sourceLineNo">179</span> public Scan() {}<a name="line.179"></a> +<span class="sourceLineNo">180</span><a name="line.180"></a> +<span class="sourceLineNo">181</span> public Scan(byte [] startRow, Filter filter) {<a name="line.181"></a> +<span class="sourceLineNo">182</span> this(startRow);<a name="line.182"></a> +<span class="sourceLineNo">183</span> this.filter = filter;<a name="line.183"></a> +<span class="sourceLineNo">184</span> }<a name="line.184"></a> +<span class="sourceLineNo">185</span><a name="line.185"></a> +<span class="sourceLineNo">186</span> /**<a name="line.186"></a> +<span class="sourceLineNo">187</span> * Create a Scan operation starting at the specified row.<a name="line.187"></a> +<span class="sourceLineNo">188</span> * <p><a name="line.188"></a> +<span class="sourceLineNo">189</span> * If the specified row does not exist, the Scanner will start from the<a name="line.189"></a> +<span class="sourceLineNo">190</span> * next closest row after the specified row.<a name="line.190"></a> +<span class="sourceLineNo">191</span> * @param startRow row to start scanner at or after<a name="line.191"></a> +<span class="sourceLineNo">192</span> */<a name="line.192"></a> +<span class="sourceLineNo">193</span> public Scan(byte [] startRow) {<a name="line.193"></a> +<span class="sourceLineNo">194</span> this.startRow = startRow;<a name="line.194"></a> +<span class="sourceLineNo">195</span> }<a name="line.195"></a> +<span class="sourceLineNo">196</span><a name="line.196"></a> +<span class="sourceLineNo">197</span> /**<a name="line.197"></a> +<span class="sourceLineNo">198</span> * Create a Scan operation for the range of rows specified.<a name="line.198"></a> +<span class="sourceLineNo">199</span> * @param startRow row to start scanner at or after (inclusive)<a name="line.199"></a> +<span class="sourceLineNo">200</span> * @param stopRow row to stop scanner before (exclusive)<a name="line.200"></a> +<span class="sourceLineNo">201</span> */<a name="line.201"></a> +<span class="sourceLineNo">202</span> public Scan(byte [] startRow, byte [] stopRow) {<a name="line.202"></a> +<span class="sourceLineNo">203</span> this.startRow = startRow;<a name="line.203"></a> +<span class="sourceLineNo">204</span> this.stopRow = stopRow;<a name="line.204"></a> +<span class="sourceLineNo">205</span> //if the startRow and stopRow both are empty, it is not a Get<a name="line.205"></a> +<span class="sourceLineNo">206</span> this.getScan = isStartRowAndEqualsStopRow();<a name="line.206"></a> +<span class="sourceLineNo">207</span> }<a name="line.207"></a> +<span class="sourceLineNo">208</span><a name="line.208"></a> +<span class="sourceLineNo">209</span> /**<a name="line.209"></a> +<span class="sourceLineNo">210</span> * Creates a new instance of this class while copying all values.<a name="line.210"></a> +<span class="sourceLineNo">211</span> *<a name="line.211"></a> +<span class="sourceLineNo">212</span> * @param scan The scan instance to copy from.<a name="line.212"></a> +<span class="sourceLineNo">213</span> * @throws IOException When copying the values fails.<a name="line.213"></a> +<span class="sourceLineNo">214</span> */<a name="line.214"></a> +<span class="sourceLineNo">215</span> public Scan(Scan scan) throws IOException {<a name="line.215"></a> +<span class="sourceLineNo">216</span> startRow = scan.getStartRow();<a name="line.216"></a> +<span class="sourceLineNo">217</span> stopRow = scan.getStopRow();<a name="line.217"></a> +<span class="sourceLineNo">218</span> maxVersions = scan.getMaxVersions();<a name="line.218"></a> +<span class="sourceLineNo">219</span> batch = scan.getBatch();<a name="line.219"></a> +<span class="sourceLineNo">220</span> storeLimit = scan.getMaxResultsPerColumnFamily();<a name="line.220"></a> +<span class="sourceLineNo">221</span> storeOffset = scan.getRowOffsetPerColumnFamily();<a name="line.221"></a> +<span class="sourceLineNo">222</span> caching = scan.getCaching();<a name="line.222"></a> +<span class="sourceLineNo">223</span> maxResultSize = scan.getMaxResultSize();<a name="line.223"></a> +<span class="sourceLineNo">224</span> cacheBlocks = scan.getCacheBlocks();<a name="line.224"></a> +<span class="sourceLineNo">225</span> getScan = scan.isGetScan();<a name="line.225"></a> +<span class="sourceLineNo">226</span> filter = scan.getFilter(); // clone?<a name="line.226"></a> +<span class="sourceLineNo">227</span> loadColumnFamiliesOnDemand = scan.getLoadColumnFamiliesOnDemandValue();<a name="line.227"></a> +<span class="sourceLineNo">228</span> consistency = scan.getConsistency();<a name="line.228"></a> +<span class="sourceLineNo">229</span> this.setIsolationLevel(scan.getIsolationLevel());<a name="line.229"></a> +<span class="sourceLineNo">230</span> reversed = scan.isReversed();<a name="line.230"></a> +<span class="sourceLineNo">231</span> asyncPrefetch = scan.isAsyncPrefetch();<a name="line.231"></a> +<span class="sourceLineNo">232</span> small = scan.isSmall();<a name="line.232"></a> +<span class="sourceLineNo">233</span> allowPartialResults = scan.getAllowPartialResults();<a name="line.233"></a> +<span class="sourceLineNo">234</span> TimeRange ctr = scan.getTimeRange();<a name="line.234"></a> +<span class="sourceLineNo">235</span> tr = new TimeRange(ctr.getMin(), ctr.getMax());<a name="line.235"></a> +<span class="sourceLineNo">236</span> Map<byte[], NavigableSet<byte[]>> fams = scan.getFamilyMap();<a name="line.236"></a> +<span class="sourceLineNo">237</span> for (Map.Entry<byte[],NavigableSet<byte[]>> entry : fams.entrySet()) {<a name="line.237"></a> +<span class="sourceLineNo">238</span> byte [] fam = entry.getKey();<a name="line.238"></a> +<span class="sourceLineNo">239</span> NavigableSet<byte[]> cols = entry.getValue();<a name="line.239"></a> +<span class="sourceLineNo">240</span> if (cols != null && cols.size() > 0) {<a name="line.240"></a> +<span class="sourceLineNo">241</span> for (byte[] col : cols) {<a name="line.241"></a> +<span class="sourceLineNo">242</span> addColumn(fam, col);<a name="line.242"></a> +<span class="sourceLineNo">243</span> }<a name="line.243"></a> +<span class="sourceLineNo">244</span> } else {<a name="line.244"></a> +<span class="sourceLineNo">245</span> addFamily(fam);<a name="line.245"></a> +<span class="sourceLineNo">246</span> }<a name="line.246"></a> +<span class="sourceLineNo">247</span> }<a name="line.247"></a> +<span class="sourceLineNo">248</span> for (Map.Entry<String, byte[]> attr : scan.getAttributesMap().entrySet()) {<a name="line.248"></a> +<span class="sourceLineNo">249</span> setAttribute(attr.getKey(), attr.getValue());<a name="line.249"></a> +<span class="sourceLineNo">250</span> }<a name="line.250"></a> +<span class="sourceLineNo">251</span> for (Map.Entry<byte[], TimeRange> entry : scan.getColumnFamilyTimeRange().entrySet()) {<a name="line.251"></a> +<span class="sourceLineNo">252</span> TimeRange tr = entry.getValue();<a name="line.252"></a> +<span class="sourceLineNo">253</span> setColumnFamilyTimeRange(entry.getKey(), tr.getMin(), tr.getMax());<a name="line.253"></a> +<span class="sourceLineNo">254</span> }<a name="line.254"></a> +<span class="sourceLineNo">255</span> }<a name="line.255"></a> +<span class="sourceLineNo">256</span><a name="line.256"></a> +<span class="sourceLineNo">257</span> /**<a name="line.257"></a> +<span class="sourceLineNo">258</span> * Builds a scan object with the same specs as get.<a name="line.258"></a> +<span class="sourceLineNo">259</span> * @param get get to model scan after<a name="line.259"></a> +<span class="sourceLineNo">260</span> */<a name="line.260"></a> +<span class="sourceLineNo">261</span> public Scan(Get get) {<a name="line.261"></a> +<span class="sourceLineNo">262</span> this.startRow = get.getRow();<a name="line.262"></a> +<span class="sourceLineNo">263</span> this.stopRow = get.getRow();<a name="line.263"></a> +<span class="sourceLineNo">264</span> this.filter = get.getFilter();<a name="line.264"></a> +<span class="sourceLineNo">265</span> this.cacheBlocks = get.getCacheBlocks();<a name="line.265"></a> +<span class="sourceLineNo">266</span> this.maxVersions = get.getMaxVersions();<a name="line.266"></a> +<span class="sourceLineNo">267</span> this.storeLimit = get.getMaxResultsPerColumnFamily();<a name="line.267"></a> +<span class="sourceLineNo">268</span> this.storeOffset = get.getRowOffsetPerColumnFamily();<a name="line.268"></a> +<span class="sourceLineNo">269</span> this.tr = get.getTimeRange();<a name="line.269"></a> +<span class="sourceLineNo">270</span> this.familyMap = get.getFamilyMap();<a name="line.270"></a> +<span class="sourceLineNo">271</span> this.getScan = true;<a name="line.271"></a> +<span class="sourceLineNo">272</span> this.asyncPrefetch = false;<a name="line.272"></a> +<span class="sourceLineNo">273</span> this.consistency = get.getConsistency();<a name="line.273"></a> +<span class="sourceLineNo">274</span> this.setIsolationLevel(get.getIsolationLevel());<a name="line.274"></a> +<span class="sourceLineNo">275</span> this.loadColumnFamiliesOnDemand = get.getLoadColumnFamiliesOnDemandValue();<a name="line.275"></a> <span class="sourceLineNo">276</span> for (Map.Entry<String, byte[]> attr : get.getAttributesMap().entrySet()) {<a name="line.276"></a> <span class="sourceLineNo">277</span> setAttribute(attr.getKey(), attr.getValue());<a name="line.277"></a> <span class="sourceLineNo">278</span> }<a name="line.278"></a> @@ -761,261 +761,229 @@ <span class="sourceLineNo">753</span> return allowPartialResults;<a name="line.753"></a> <span class="sourceLineNo">754</span> }<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> * Set the value indicating whether loading CFs on demand should be allowed (cluster<a name="line.757"></a> -<span class="sourceLineNo">758</span> * default is false). On-demand CF loading doesn't load column families until necessary, e.g.<a name="line.758"></a> -<span class="sourceLineNo">759</span> * if you filter on one column, the other column family data will be loaded only for the rows<a name="line.759"></a> -<span class="sourceLineNo">760</span> * that are included in result, not all rows like in normal case.<a name="line.760"></a> -<span class="sourceLineNo">761</span> * With column-specific filters, like SingleColumnValueFilter w/filterIfMissing == true,<a name="line.761"></a> -<span class="sourceLineNo">762</span> * this can deliver huge perf gains when there's a cf with lots of data; however, it can<a name="line.762"></a> -<span class="sourceLineNo">763</span> * also lead to some inconsistent results, as follows:<a name="line.763"></a> -<span class="sourceLineNo">764</span> * - if someone does a concurrent update to both column families in question you may get a row<a name="line.764"></a> -<span class="sourceLineNo">765</span> * that never existed, e.g. for { rowKey = 5, { cat_videos =&gt; 1 }, { video =&gt; "my cat" } }<a name="line.765"></a> -<span class="sourceLineNo">766</span> * someone puts rowKey 5 with { cat_videos =&gt; 0 }, { video =&gt; "my dog" }, concurrent scan<a name="line.766"></a> -<span class="sourceLineNo">767</span> * filtering on "cat_videos == 1" can get { rowKey = 5, { cat_videos =&gt; 1 },<a name="line.767"></a> -<span class="sourceLineNo">768</span> * { video =&gt; "my dog" } }.<a name="line.768"></a> -<span class="sourceLineNo">769</span> * - if there's a concurrent split and you have more than 2 column families, some rows may be<a name="line.769"></a> -<span class="sourceLineNo">770</span> * missing some column families.<a name="line.770"></a> -<span class="sourceLineNo">771</span> */<a name="line.771"></a> -<span class="sourceLineNo">772</span> public Scan setLoadColumnFamiliesOnDemand(boolean value) {<a name="line.772"></a> -<span class="sourceLineNo">773</span> this.loadColumnFamiliesOnDemand = value;<a name="line.773"></a> -<span class="sourceLineNo">774</span> return this;<a name="line.774"></a> -<span class="sourceLineNo">775</span> }<a name="line.775"></a> -<span class="sourceLineNo">776</span><a name="line.776"></a> -<span class="sourceLineNo">777</span> /**<a name="line.777"></a> -<span class="sourceLineNo">778</span> * Get the raw loadColumnFamiliesOnDemand setting; if it's not set, can be null.<a name="line.778"></a> -<span class="sourceLineNo">779</span> */<a name="line.779"></a> -<span class="sourceLineNo">780</span> public Boolean getLoadColumnFamiliesOnDemandValue() {<a name="line.780"></a> -<span class="sourceLineNo">781</span> return this.loadColumnFamiliesOnDemand;<a name="line.781"></a> -<span class="sourceLineNo">782</span> }<a name="line.782"></a> -<span class="sourceLineNo">783</span><a name="line.783"></a> -<span class="sourceLineNo">784</span> /**<a name="line.784"></a> -<span class="sourceLineNo">785</span> * Get the logical value indicating whether on-demand CF loading should be allowed.<a name="line.785"></a> -<span class="sourceLineNo">786</span> */<a name="line.786"></a> -<span class="sourceLineNo">787</span> public boolean doLoadColumnFamiliesOnDemand() {<a name="line.787"></a> -<span class="sourceLineNo">788</span> return (this.loadColumnFamiliesOnDemand != null)<a name="line.788"></a> -<span class="sourceLineNo">789</span> && this.loadColumnFamiliesOnDemand.booleanValue();<a name="line.789"></a> -<span class="sourceLineNo">790</span> }<a name="line.790"></a> -<span class="sourceLineNo">791</span><a name="line.791"></a> -<span class="sourceLineNo">792</span> /**<a name="line.792"></a> -<span class="sourceLineNo">793</span> * Compile the table and column family (i.e. schema) information<a name="line.793"></a> -<span class="sourceLineNo">794</span> * into a String. Useful for parsing and aggregation by debugging,<a name="line.794"></a> -<span class="sourceLineNo">795</span> * logging, and administration tools.<a name="line.795"></a> -<span class="sourceLineNo">796</span> * @return Map<a name="line.796"></a> -<span class="sourceLineNo">797</span> */<a name="line.797"></a> -<span class="sourceLineNo">798</span> @Override<a name="line.798"></a> -<span class="sourceLineNo">799</span> public Map<String, Object> getFingerprint() {<a name="line.799"></a> -<span class="sourceLineNo">800</span> Map<String, Object> map = new HashMap<String, Object>();<a name="line.800"></a> -<span class="sourceLineNo">801</span> List<String> families = new ArrayList<String>();<a name="line.801"></a> -<span class="sourceLineNo">802</span> if(this.familyMap.size() == 0) {<a name="line.802"></a> -<span class="sourceLineNo">803</span> map.put("families", "ALL");<a name="line.803"></a> -<span class="sourceLineNo">804</span> return map;<a name="line.804"></a> -<span class="sourceLineNo">805</span> } else {<a name="line.805"></a> -<span class="sourceLineNo">806</span> map.put("families", families);<a name="line.806"></a> -<span class="sourceLineNo">807</span> }<a name="line.807"></a> -<span class="sourceLineNo">808</span> for (Map.Entry<byte [], NavigableSet<byte[]>> entry :<a name="line.808"></a> -<span class="sourceLineNo">809</span> this.familyMap.entrySet()) {<a name="line.809"></a> -<span class="sourceLineNo">810</span> families.add(Bytes.toStringBinary(entry.getKey()));<a name="line.810"></a> -<span class="sourceLineNo">811</span> }<a name="line.811"></a> -<span class="sourceLineNo">812</span> return map;<a name="line.812"></a> -<span class="sourceLineNo">813</span> }<a name="line.813"></a> -<span class="sourceLineNo">814</span><a name="line.814"></a> -<span class="sourceLineNo">815</span> /**<a name="line.815"></a> -<span class="sourceLineNo">816</span> * Compile the details beyond the scope of getFingerprint (row, columns,<a name="line.816"></a> -<span class="sourceLineNo">817</span> * timestamps, etc.) into a Map along with the fingerprinted information.<a name="line.817"></a> -<span class="sourceLineNo">818</span> * Useful for debugging, logging, and administration tools.<a name="line.818"></a> -<span class="sourceLineNo">819</span> * @param maxCols a limit on the number of columns output prior to truncation<a name="line.819"></a> -<span class="sourceLineNo">820</span> * @return Map<a name="line.820"></a> -<span class="sourceLineNo">821</span> */<a name="line.821"></a> -<span class="sourceLineNo">822</span> @Override<a name="line.822"></a> -<span class="sourceLineNo">823</span> public Map<String, Object> toMap(int maxCols) {<a name="line.823"></a> -<span class="sourceLineNo">824</span> // start with the fingerpring map and build on top of it<a name="line.824"></a> -<span class="sourceLineNo">825</span> Map<String, Object> map = getFingerprint();<a name="line.825"></a> -<span class="sourceLineNo">826</span> // map from families to column list replaces fingerprint's list of families<a name="line.826"></a> -<span class="sourceLineNo">827</span> Map<String, List<String>> familyColumns =<a name="line.827"></a> -<span class="sourceLineNo">828</span> new HashMap<String, List<String>>();<a name="line.828"></a> -<span class="sourceLineNo">829</span> map.put("families", familyColumns);<a name="line.829"></a> -<span class="sourceLineNo">830</span> // add scalar information first<a name="line.830"></a> -<span class="sourceLineNo">831</span> map.put("startRow", Bytes.toStringBinary(this.startRow));<a name="line.831"></a> -<span class="sourceLineNo">832</span> map.put("stopRow", Bytes.toStringBinary(this.stopRow));<a name="line.832"></a> -<span class="sourceLineNo">833</span> map.put("maxVersions", this.maxVersions);<a name="line.833"></a> -<span class="sourceLineNo">834</span> map.put("batch", this.batch);<a name="line.834"></a> -<span class="sourceLineNo">835</span> map.put("caching", this.caching);<a name="line.835"></a> -<span class="sourceLineNo">836</span> map.put("maxResultSize", this.maxResultSize);<a name="line.836"></a> -<span class="sourceLineNo">837</span> map.put("cacheBlocks", this.cacheBlocks);<a name="line.837"></a> -<span class="sourceLineNo">838</span> map.put("loadColumnFamiliesOnDemand", this.loadColumnFamiliesOnDemand);<a name="line.838"></a> -<span class="sourceLineNo">839</span> List<Long> timeRange = new ArrayList<Long>();<a name="line.839"></a> -<span class="sourceLineNo">840</span> timeRange.add(this.tr.getMin());<a name="line.840"></a> -<span class="sourceLineNo">841</span> timeRange.add(this.tr.getMax());<a name="line.841"></a> -<span class="sourceLineNo">842</span> map.put("timeRange", timeRange);<a name="line.842"></a> -<span class="sourceLineNo">843</span> int colCount = 0;<a name="line.843"></a> -<span class="sourceLineNo">844</span> // iterate through affected families and list out up to maxCols columns<a 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[HBASE-9488].<a name="line.915"></a> -<span class="sourceLineNo">916</span> *<a name="line.916"></a> -<span class="sourceLineNo">917</span> * Generally, if the scan range is within one data block(64KB), it could be<a name="line.917"></a> -<span class="sourceLineNo">918</span> * considered as a small scan.<a name="line.918"></a> -<span class="sourceLineNo">919</span> *<a name="line.919"></a> -<span class="sourceLineNo">920</span> * @param small<a name="line.920"></a> -<span class="sourceLineNo">921</span> */<a name="line.921"></a> -<span class="sourceLineNo">922</span> public Scan setSmall(boolean small) {<a name="line.922"></a> -<span class="sourceLineNo">923</span> this.small = small;<a name="line.923"></a> -<span class="sourceLineNo">924</span> return this;<a name="line.924"></a> -<span class="sourceLineNo">925</span> }<a name="line.925"></a> -<span class="sourceLineNo">926</span><a name="line.926"></a> -<span class="sourceLineNo">927</span> /**<a name="line.927"></a> -<span class="sourceLineNo">928</span> * Get whether this scan is a small scan<a name="line.928"></a> -<span class="sourceLineNo">929</span> * @return true if small scan<a name="line.929"></a> -<span class="sourceLineNo">930</span> */<a name="line.930"></a> -<span class="sourceLineNo">931</span> public boolean isSmall() {<a name="line.931"></a> -<span class="sourceLineNo">932</span> return small;<a name="line.932"></a> -<span class="sourceLineNo">933</span> }<a name="line.933"></a> -<span class="sourceLineNo">934</span><a name="line.934"></a> -<span class="sourceLineNo">935</span> @Override<a name="line.935"></a> -<span class="sourceLineNo">936</span> public Scan setAttribute(String name, byte[] value) {<a name="line.936"></a> -<span class="sourceLineNo">937</span> return (Scan) super.setAttribute(name, value);<a name="line.937"></a> -<span class="sourceLineNo">938</span> }<a name="line.938"></a> -<span class="sourceLineNo">939</span><a name="line.939"></a> -<span class="sourceLineNo">940</span> @Override<a name="line.940"></a> -<span class="sourceLineNo">941</span> public Scan setId(String id) {<a name="line.941"></a> -<span class="sourceLineNo">942</span> return (Scan) super.setId(id);<a name="line.942"></a> -<span class="sourceLineNo">943</span> }<a name="line.943"></a> -<span class="sourceLineNo">944</span><a name="line.944"></a> -<span class="sourceLineNo">945</span> @Override<a name="line.945"></a> -<span class="sourceLineNo">946</span> public Scan setAuthorizations(Authorizations authorizations) {<a name="line.946"></a> -<span class="sourceLineNo">947</span> return (Scan) super.setAuthorizations(authorizations);<a name="line.947"></a> -<span class="sourceLineNo">948</span> }<a name="line.948"></a> -<span class="sourceLineNo">949</span><a name="line.949"></a> -<span class="sourceLineNo">950</span> @Override<a name="line.950"></a> -<span class="sourceLineNo">951</span> public Scan setACL(Map<String, Permission> perms) {<a name="line.951"></a> -<span class="sourceLineNo">952</span> return (Scan) super.setACL(perms);<a name="line.952"></a> -<span class="sourceLineNo">953</span> }<a name="line.953"></a> -<span class="sourceLineNo">954</span><a name="line.954"></a> -<span class="sourceLineNo">955</span> @Override<a name="line.955"></a> -<span class="sourceLineNo">956</span> public Scan setACL(String user, Permission perms) {<a name="line.956"></a> -<span class="sourceLineNo">957</span> return (Scan) super.setACL(user, perms);<a name="line.957"></a> +<span class="sourceLineNo">756</span> public Scan setLoadColumnFamiliesOnDemand(boolean value) {<a name="line.756"></a> +<span class="sourceLineNo">757</span> return (Scan) super.setLoadColumnFamiliesOnDemand(value);<a name="line.757"></a> +<span class="sourceLineNo">758</span> }<a name="line.758"></a> +<span class="sourceLineNo">759</span><a name="line.759"></a> +<span class="sourceLineNo">760</span> /**<a name="line.760"></a> +<span class="sourceLineNo">761</span> * Compile the table and column family (i.e. schema) information<a name="line.761"></a> +<span class="sourceLineNo">762</span> * into a String. Useful for parsing and aggregation by debugging,<a name="line.762"></a> +<span class="sourceLineNo">763</span> * logging, and administration tools.<a name="line.763"></a> +<span class="sourceLineNo">764</span> * @return Map<a name="line.764"></a> +<span class="sourceLineNo">765</span> */<a name="line.765"></a> +<span class="sourceLineNo">766</span> @Override<a name="line.766"></a> +<span class="sourceLineNo">767</span> public Map<String, Object> getFingerprint() {<a name="line.767"></a> +<span class="sourceLineNo">768</span> Map<String, Object> map = new HashMap<String, Object>();<a name="line.768"></a> +<span class="sourceLineNo">769</span> List<String> families = new ArrayList<String>();<a name="line.769"></a> +<span class="sourceLineNo">770</span> if(this.familyMap.size() == 0) {<a name="line.770"></a> +<span class="sourceLineNo">771</span> map.put("families", "ALL");<a name="line.771"></a> +<span class="sourceLineNo">772</span> return map;<a name="line.772"></a> +<span class="sourceLineNo">773</span> } else {<a name="line.773"></a> +<span class="sourceLineNo">774</span> map.put("families", families);<a name="line.774"></a> +<span class="sourceLineNo">775</span> }<a name="line.775"></a> +<span class="sourceLineNo">776</span> for (Map.Entry<byte [], NavigableSet<byte[]>> entry :<a name="line.776"></a> +<span class="sourceLineNo">777</span> this.familyMap.entrySet()) {<a name="line.777"></a> +<span class="sourceLineNo">778</span> families.add(Bytes.toStringBinary(entry.getKey()));<a name="line.778"></a> +<span class="sourceLineNo">779</span> }<a name="line.779"></a> +<span class="sourceLineNo">780</span> return map;<a name="line.780"></a> +<span class="sourceLineNo">781</span> }<a name="line.781"></a> +<span class="sourceLineNo">782</span><a name="line.782"></a> +<span class="sourceLineNo">783</span> /**<a name="line.783"></a> +<span class="sourceLineNo">784</span> * Compile the details beyond the scope of getFingerprint (row, columns,<a name="line.784"></a> +<span class="sourceLineNo">785</span> * timestamps, etc.) into a Map along with the fingerprinted information.<a name="line.785"></a> +<span class="sourceLineNo">786</span> * Useful for debugging, logging, and administration tools.<a name="line.786"></a> +<span class="sourceLineNo">787</span> * @param maxCols a limit on the number of columns output prior to truncation<a name="line.787"></a> +<span class="sourceLineNo">788</span> * @return Map<a name="line.788"></a> +<span class="sourceLineNo">789</span> */<a name="line.789"></a> +<span class="sourceLineNo">790</span> @Override<a name="line.790"></a> +<span class="sourceLineNo">791</span> public Map<String, Object> toMap(int maxCols) {<a name="line.791"></a> +<span class="sourceLineNo">792</span> // start with the fingerpring map and build on top of it<a name="line.792"></a> +<span class="sourceLineNo">793</span> Map<String, Object> map = getFingerprint();<a name="line.793"></a> +<span class="sourceLineNo">794</span> // map from families to column list replaces fingerprint's list of families<a name="line.794"></a> +<span class="sourceLineNo">795</span> Map<String, List<String>> familyColumns =<a name="line.795"></a> +<span class="sourceLineNo">796</span> new HashMap<String, List<String>>();<a name="line.796"></a> +<span class="sourceLineNo">797</span> map.put("families", familyColumns);<a name="line.797"></a> +<span class="sourceLineNo">798</span> // add scalar information first<a name="line.798"></a> +<span class="sourceLineNo">799</span> map.put("startRow", Bytes.toStringBinary(this.startRow));<a name="line.799"></a> +<span class="sourceLineNo">800</span> map.put("stopRow", Bytes.toStringBinary(this.stopRow));<a name="line.800"></a> +<span class="sourceLineNo">801</span> map.put("maxVersions", this.maxVersions);<a name="line.801"></a> +<span class="sourceLineNo">802</span> map.put("batch", this.batch);<a name="line.802"></a> +<span class="sourceLineNo">803</span> map.put("caching", this.caching);<a name="line.803"></a> +<span class="sourceLineNo">804</span> map.put("maxResultSize", this.maxResultSize);<a name="line.804"></a> +<span class="sourceLineNo">805</span> map.put("cacheBlocks", this.cacheBlocks);<a name="line.805"></a> +<span class="sourceLineNo">806</span> map.put("loadColumnFamiliesOnDemand", this.loadColumnFamiliesOnDemand);<a name="line.806"></a> +<span class="sourceLineNo">807</span> List<Long> timeRange = new ArrayList<Long>();<a name="line.807"></a> +<span class="sourceLineNo">808</span> timeRange.add(this.tr.getMin());<a name="line.808"></a> +<span class="sourceLineNo">809</span> timeRange.add(this.tr.getMax());<a name="line.809"></a> +<span class="sourceLineNo">810</span> map.put("timeRange", timeRange);<a name="line.810"></a> +<span class="sourceLineNo">811</span> int colCount = 0;<a name="line.811"></a> +<span class="sourceLineNo">812</span> // iterate through affected families and list out up to maxCols columns<a 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(maxCols <= 0) {<a name="line.823"></a> +<span class="sourceLineNo">824</span> continue;<a name="line.824"></a> +<span class="sourceLineNo">825</span> }<a name="line.825"></a> +<span class="sourceLineNo">826</span> for (byte [] column : entry.getValue()) {<a name="line.826"></a> +<span class="sourceLineNo">827</span> if (--maxCols <= 0) {<a name="line.827"></a> +<span class="sourceLineNo">828</span> continue;<a name="line.828"></a> +<span class="sourceLineNo">829</span> }<a name="line.829"></a> +<span class="sourceLineNo">830</span> columns.add(Bytes.toStringBinary(column));<a name="line.830"></a> +<span class="sourceLineNo">831</span> }<a name="line.831"></a> +<span class="sourceLineNo">832</span> }<a name="line.832"></a> +<span class="sourceLineNo">833</span> }<a name="line.833"></a> +<span class="sourceLineNo">834</span> map.put("totalColumns", colCount);<a name="line.834"></a> +<span class="sourceLineNo">835</span> if (this.filter != null) {<a name="line.835"></a> +<span class="sourceLineNo">836</span> map.put("filter", this.filter.toString());<a name="line.836"></a> +<span class="sourceLineNo">837</span> }<a name="line.837"></a> +<span class="sourceLineNo">838</span> // add the id if set<a name="line.838"></a> +<span class="sourceLineNo">839</span> if (getId() != null) {<a name="line.839"></a> +<span class="sourceLineNo">840</span> map.put("id", getId());<a name="line.840"></a> +<span class="sourceLineNo">841</span> }<a name="line.841"></a> +<span class="sourceLineNo">842</span> return map;<a name="line.842"></a> +<span class="sourceLineNo">843</span> }<a name="line.843"></a> +<span class="sourceLineNo">844</span><a name="line.844"></a> +<span class="sourceLineNo">845</span> /**<a name="line.845"></a> +<span class="sourceLineNo">846</span> * Enable/disable "raw" mode for this scan.<a name="line.846"></a> +<span class="sourceLineNo">847</span> * If "raw" is enabled the scan will return all<a name="line.847"></a> +<span class="sourceLineNo">848</span> * delete marker and deleted rows that have not<a name="line.848"></a> +<span class="sourceLineNo">849</span> * been collected, yet.<a name="line.849"></a> +<span class="sourceLineNo">850</span> * This is mostly useful for Scan on column families<a name="line.850"></a> +<span class="sourceLineNo">851</span> * that have KEEP_DELETED_ROWS enabled.<a name="line.851"></a> +<span class="sourceLineNo">852</span> * It is an error to specify any column when "raw" is set.<a name="line.852"></a> +<span class="sourceLineNo">853</span> * @param raw True/False to enable/disable "raw" mode.<a name="line.853"></a> +<span class="sourceLineNo">854</span> */<a name="line.854"></a> +<span class="sourceLineNo">855</span> public Scan setRaw(boolean raw) {<a name="line.855"></a> +<span class="sourceLineNo">856</span> setAttribute(RAW_ATTR, Bytes.toBytes(raw));<a name="line.856"></a> +<span class="sourceLineNo">857</span> return this;<a name="line.857"></a> +<span class="sourceLineNo">858</span> }<a 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scan is a small scan<a name="line.871"></a> +<span class="sourceLineNo">872</span> * <p><a name="line.872"></a> +<span class="sourceLineNo">873</span> * Small scan should use pread and big scan can use seek + read<a name="line.873"></a> +<span class="sourceLineNo">874</span> *<a name="line.874"></a> +<span class="sourceLineNo">875</span> * seek + read is fast but can cause two problem (1) resource contention (2)<a name="line.875"></a> +<span class="sourceLineNo">876</span> * cause too much network io<a name="line.876"></a> +<span class="sourceLineNo">877</span> *<a name="line.877"></a> +<span class="sourceLineNo">878</span> * [89-fb] Using pread for non-compaction read request<a name="line.878"></a> +<span class="sourceLineNo">879</span> * https://issues.apache.org/jira/browse/HBASE-7266<a name="line.879"></a> +<span class="sourceLineNo">880</span> *<a name="line.880"></a> +<span class="sourceLineNo">881</span> * On the other hand, if setting it true, we would do<a name="line.881"></a> 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