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Posted to commits@hbase.apache.org by gi...@apache.org on 2018/05/12 14:48:13 UTC
[29/51] [partial] hbase-site git commit: Published site at
021f66d11d2cbb7308308093e29e69d6e7661ee9.
http://git-wip-us.apache.org/repos/asf/hbase-site/blob/92a26cfb/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/CompactionPipeline.html
----------------------------------------------------------------------
diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/CompactionPipeline.html b/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/CompactionPipeline.html
index 2ab9e4d..c18869f 100644
--- a/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/CompactionPipeline.html
+++ b/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/CompactionPipeline.html
@@ -31,323 +31,327 @@
<span class="sourceLineNo">023</span>import java.util.LinkedList;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import java.util.List;<a name="line.24"></a>
<span class="sourceLineNo">025</span><a name="line.25"></a>
-<span class="sourceLineNo">026</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.26"></a>
-<span class="sourceLineNo">027</span>import org.slf4j.Logger;<a name="line.27"></a>
-<span class="sourceLineNo">028</span>import org.slf4j.LoggerFactory;<a name="line.28"></a>
-<span class="sourceLineNo">029</span>import org.apache.hadoop.hbase.util.Bytes;<a name="line.29"></a>
-<span class="sourceLineNo">030</span>import org.apache.hadoop.hbase.util.ClassSize;<a name="line.30"></a>
-<span class="sourceLineNo">031</span><a name="line.31"></a>
-<span class="sourceLineNo">032</span>/**<a name="line.32"></a>
-<span class="sourceLineNo">033</span> * The compaction pipeline of a {@link CompactingMemStore}, is a FIFO queue of segments.<a name="line.33"></a>
-<span class="sourceLineNo">034</span> * It supports pushing a segment at the head of the pipeline and removing a segment from the<a name="line.34"></a>
-<span class="sourceLineNo">035</span> * tail when it is flushed to disk.<a name="line.35"></a>
-<span class="sourceLineNo">036</span> * It also supports swap method to allow the in-memory compaction swap a subset of the segments<a name="line.36"></a>
-<span class="sourceLineNo">037</span> * at the tail of the pipeline with a new (compacted) one. This swap succeeds only if the version<a name="line.37"></a>
-<span class="sourceLineNo">038</span> * number passed with the list of segments to swap is the same as the current version of the<a name="line.38"></a>
-<span class="sourceLineNo">039</span> * pipeline.<a name="line.39"></a>
-<span class="sourceLineNo">040</span> * Essentially, there are two methods which can change the structure of the pipeline: pushHead()<a name="line.40"></a>
-<span class="sourceLineNo">041</span> * and swap(), the later is used both by a flush to disk and by an in-memory compaction.<a name="line.41"></a>
-<span class="sourceLineNo">042</span> * The pipeline version is updated by swap(); it allows to identify conflicting operations at the<a name="line.42"></a>
-<span class="sourceLineNo">043</span> * suffix of the pipeline.<a name="line.43"></a>
-<span class="sourceLineNo">044</span> *<a name="line.44"></a>
-<span class="sourceLineNo">045</span> * The synchronization model is copy-on-write. Methods which change the structure of the<a name="line.45"></a>
-<span class="sourceLineNo">046</span> * pipeline (pushHead(), flattenOneSegment() and swap()) apply their changes in the context of a<a name="line.46"></a>
-<span class="sourceLineNo">047</span> * lock. They also make a read-only copy of the pipeline's list. Read methods read from a<a name="line.47"></a>
-<span class="sourceLineNo">048</span> * read-only copy. If a read method accesses the read-only copy more than once it makes a local<a name="line.48"></a>
-<span class="sourceLineNo">049</span> * copy of it to ensure it accesses the same copy.<a name="line.49"></a>
-<span class="sourceLineNo">050</span> *<a name="line.50"></a>
-<span class="sourceLineNo">051</span> * The methods getVersionedList(), getVersionedTail(), and flattenOneSegment() are also<a name="line.51"></a>
-<span class="sourceLineNo">052</span> * protected by a lock since they need to have a consistent (atomic) view of the pipeline list<a name="line.52"></a>
-<span class="sourceLineNo">053</span> * and version number.<a name="line.53"></a>
-<span class="sourceLineNo">054</span> */<a name="line.54"></a>
-<span class="sourceLineNo">055</span>@InterfaceAudience.Private<a name="line.55"></a>
-<span class="sourceLineNo">056</span>public class CompactionPipeline {<a name="line.56"></a>
-<span class="sourceLineNo">057</span> private static final Logger LOG = LoggerFactory.getLogger(CompactionPipeline.class);<a name="line.57"></a>
-<span class="sourceLineNo">058</span><a name="line.58"></a>
-<span class="sourceLineNo">059</span> public final static long FIXED_OVERHEAD = ClassSize<a name="line.59"></a>
-<span class="sourceLineNo">060</span> .align(ClassSize.OBJECT + (3 * ClassSize.REFERENCE) + Bytes.SIZEOF_LONG);<a name="line.60"></a>
-<span class="sourceLineNo">061</span> public final static long DEEP_OVERHEAD = FIXED_OVERHEAD + (2 * ClassSize.LINKEDLIST);<a name="line.61"></a>
-<span class="sourceLineNo">062</span><a name="line.62"></a>
-<span class="sourceLineNo">063</span> private final RegionServicesForStores region;<a name="line.63"></a>
-<span class="sourceLineNo">064</span> private final LinkedList<ImmutableSegment> pipeline = new LinkedList<>();<a name="line.64"></a>
-<span class="sourceLineNo">065</span> // The list is volatile to avoid reading a new allocated reference before the c'tor is executed<a name="line.65"></a>
-<span class="sourceLineNo">066</span> private volatile LinkedList<ImmutableSegment> readOnlyCopy = new LinkedList<>();<a name="line.66"></a>
-<span class="sourceLineNo">067</span> // Version is volatile to ensure it is atomically read when not using a lock<a name="line.67"></a>
-<span class="sourceLineNo">068</span> private volatile long version = 0;<a name="line.68"></a>
-<span class="sourceLineNo">069</span><a name="line.69"></a>
-<span class="sourceLineNo">070</span> public CompactionPipeline(RegionServicesForStores region) {<a name="line.70"></a>
-<span class="sourceLineNo">071</span> this.region = region;<a name="line.71"></a>
-<span class="sourceLineNo">072</span> }<a name="line.72"></a>
-<span class="sourceLineNo">073</span><a name="line.73"></a>
-<span class="sourceLineNo">074</span> public boolean pushHead(MutableSegment segment) {<a name="line.74"></a>
-<span class="sourceLineNo">075</span> ImmutableSegment immutableSegment = SegmentFactory.instance().<a name="line.75"></a>
-<span class="sourceLineNo">076</span> createImmutableSegment(segment);<a name="line.76"></a>
-<span class="sourceLineNo">077</span> synchronized (pipeline){<a name="line.77"></a>
-<span class="sourceLineNo">078</span> boolean res = addFirst(immutableSegment);<a name="line.78"></a>
-<span class="sourceLineNo">079</span> readOnlyCopy = new LinkedList<>(pipeline);<a name="line.79"></a>
-<span class="sourceLineNo">080</span> return res;<a name="line.80"></a>
-<span class="sourceLineNo">081</span> }<a name="line.81"></a>
-<span class="sourceLineNo">082</span> }<a name="line.82"></a>
-<span class="sourceLineNo">083</span><a name="line.83"></a>
-<span class="sourceLineNo">084</span> public VersionedSegmentsList getVersionedList() {<a name="line.84"></a>
-<span class="sourceLineNo">085</span> synchronized (pipeline){<a name="line.85"></a>
-<span class="sourceLineNo">086</span> return new VersionedSegmentsList(readOnlyCopy, version);<a name="line.86"></a>
-<span class="sourceLineNo">087</span> }<a name="line.87"></a>
-<span class="sourceLineNo">088</span> }<a name="line.88"></a>
-<span class="sourceLineNo">089</span><a name="line.89"></a>
-<span class="sourceLineNo">090</span> public VersionedSegmentsList getVersionedTail() {<a name="line.90"></a>
-<span class="sourceLineNo">091</span> synchronized (pipeline){<a name="line.91"></a>
-<span class="sourceLineNo">092</span> List<ImmutableSegment> segmentList = new ArrayList<>();<a name="line.92"></a>
-<span class="sourceLineNo">093</span> if(!pipeline.isEmpty()) {<a name="line.93"></a>
-<span class="sourceLineNo">094</span> segmentList.add(0, pipeline.getLast());<a name="line.94"></a>
-<span class="sourceLineNo">095</span> }<a name="line.95"></a>
-<span class="sourceLineNo">096</span> return new VersionedSegmentsList(segmentList, version);<a name="line.96"></a>
-<span class="sourceLineNo">097</span> }<a name="line.97"></a>
-<span class="sourceLineNo">098</span> }<a name="line.98"></a>
-<span class="sourceLineNo">099</span><a name="line.99"></a>
-<span class="sourceLineNo">100</span> /**<a name="line.100"></a>
-<span class="sourceLineNo">101</span> * Swaps the versioned list at the tail of the pipeline with a new segment.<a name="line.101"></a>
-<span class="sourceLineNo">102</span> * Swapping only if there were no changes to the suffix of the list since the version list was<a name="line.102"></a>
-<span class="sourceLineNo">103</span> * created.<a name="line.103"></a>
-<span class="sourceLineNo">104</span> * @param versionedList suffix of the pipeline to be replaced can be tail or all the pipeline<a name="line.104"></a>
-<span class="sourceLineNo">105</span> * @param segment new segment to replace the suffix. Can be null if the suffix just needs to be<a name="line.105"></a>
-<span class="sourceLineNo">106</span> * removed.<a name="line.106"></a>
-<span class="sourceLineNo">107</span> * @param closeSuffix whether to close the suffix (to release memory), as part of swapping it out<a name="line.107"></a>
-<span class="sourceLineNo">108</span> * During index merge op this will be false and for compaction it will be true.<a name="line.108"></a>
-<span class="sourceLineNo">109</span> * @param updateRegionSize whether to update the region size. Update the region size,<a name="line.109"></a>
-<span class="sourceLineNo">110</span> * when the pipeline is swapped as part of in-memory-flush and<a name="line.110"></a>
-<span class="sourceLineNo">111</span> * further merge/compaction. Don't update the region size when the<a name="line.111"></a>
-<span class="sourceLineNo">112</span> * swap is result of the snapshot (flush-to-disk).<a name="line.112"></a>
-<span class="sourceLineNo">113</span> * @return true iff swapped tail with new segment<a name="line.113"></a>
-<span class="sourceLineNo">114</span> */<a name="line.114"></a>
-<span class="sourceLineNo">115</span> @edu.umd.cs.findbugs.annotations.SuppressWarnings(value="VO_VOLATILE_INCREMENT",<a name="line.115"></a>
-<span class="sourceLineNo">116</span> justification="Increment is done under a synchronize block so safe")<a name="line.116"></a>
-<span class="sourceLineNo">117</span> public boolean swap(VersionedSegmentsList versionedList, ImmutableSegment segment,<a name="line.117"></a>
-<span class="sourceLineNo">118</span> boolean closeSuffix, boolean updateRegionSize) {<a name="line.118"></a>
-<span class="sourceLineNo">119</span> if (versionedList.getVersion() != version) {<a name="line.119"></a>
-<span class="sourceLineNo">120</span> return false;<a name="line.120"></a>
-<span class="sourceLineNo">121</span> }<a name="line.121"></a>
-<span class="sourceLineNo">122</span> List<ImmutableSegment> suffix;<a name="line.122"></a>
-<span class="sourceLineNo">123</span> synchronized (pipeline){<a name="line.123"></a>
-<span class="sourceLineNo">124</span> if(versionedList.getVersion() != version) {<a name="line.124"></a>
-<span class="sourceLineNo">125</span> return false;<a name="line.125"></a>
-<span class="sourceLineNo">126</span> }<a name="line.126"></a>
-<span class="sourceLineNo">127</span> suffix = versionedList.getStoreSegments();<a name="line.127"></a>
-<span class="sourceLineNo">128</span> LOG.debug("Swapping pipeline suffix; before={}, new segment={}",<a name="line.128"></a>
-<span class="sourceLineNo">129</span> versionedList.getStoreSegments().size(), segment);<a name="line.129"></a>
-<span class="sourceLineNo">130</span> swapSuffix(suffix, segment, closeSuffix);<a name="line.130"></a>
-<span class="sourceLineNo">131</span> readOnlyCopy = new LinkedList<>(pipeline);<a name="line.131"></a>
-<span class="sourceLineNo">132</span> version++;<a name="line.132"></a>
-<span class="sourceLineNo">133</span> }<a name="line.133"></a>
-<span class="sourceLineNo">134</span> if (updateRegionSize && region != null) {<a name="line.134"></a>
-<span class="sourceLineNo">135</span> // update the global memstore size counter<a name="line.135"></a>
-<span class="sourceLineNo">136</span> long suffixDataSize = getSegmentsKeySize(suffix);<a name="line.136"></a>
-<span class="sourceLineNo">137</span> long newDataSize = 0;<a name="line.137"></a>
-<span class="sourceLineNo">138</span> if(segment != null) newDataSize = segment.keySize();<a name="line.138"></a>
-<span class="sourceLineNo">139</span> long dataSizeDelta = suffixDataSize - newDataSize;<a name="line.139"></a>
-<span class="sourceLineNo">140</span> long suffixHeapSize = getSegmentsHeapSize(suffix);<a name="line.140"></a>
-<span class="sourceLineNo">141</span> long suffixOffHeapSize = getSegmentsOffHeapSize(suffix);<a name="line.141"></a>
-<span class="sourceLineNo">142</span> long newHeapSize = 0;<a name="line.142"></a>
-<span class="sourceLineNo">143</span> long newOffHeapSize = 0;<a name="line.143"></a>
-<span class="sourceLineNo">144</span> if(segment != null) {<a name="line.144"></a>
-<span class="sourceLineNo">145</span> newHeapSize = segment.heapSize();<a name="line.145"></a>
-<span class="sourceLineNo">146</span> newOffHeapSize = segment.offHeapSize();<a name="line.146"></a>
-<span class="sourceLineNo">147</span> }<a name="line.147"></a>
-<span class="sourceLineNo">148</span> long offHeapSizeDelta = suffixOffHeapSize - newOffHeapSize;<a name="line.148"></a>
-<span class="sourceLineNo">149</span> long heapSizeDelta = suffixHeapSize - newHeapSize;<a name="line.149"></a>
-<span class="sourceLineNo">150</span> region.addMemStoreSize(new MemStoreSize(-dataSizeDelta, -heapSizeDelta, -offHeapSizeDelta));<a name="line.150"></a>
-<span class="sourceLineNo">151</span> LOG.debug("Suffix data size={}, new segment data size={}, "<a name="line.151"></a>
-<span class="sourceLineNo">152</span> + "suffix heap size={}," + "new segment heap size={}"<a name="line.152"></a>
-<span class="sourceLineNo">153</span> + "suffix off heap size={}," + "new segment off heap size={}"<a name="line.153"></a>
-<span class="sourceLineNo">154</span> , suffixDataSize<a name="line.154"></a>
-<span class="sourceLineNo">155</span> , newDataSize<a name="line.155"></a>
-<span class="sourceLineNo">156</span> , suffixHeapSize<a name="line.156"></a>
-<span class="sourceLineNo">157</span> , newHeapSize<a name="line.157"></a>
-<span class="sourceLineNo">158</span> , suffixOffHeapSize<a name="line.158"></a>
-<span class="sourceLineNo">159</span> , newOffHeapSize);<a name="line.159"></a>
-<span class="sourceLineNo">160</span> }<a name="line.160"></a>
-<span class="sourceLineNo">161</span> return true;<a name="line.161"></a>
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-<span class="sourceLineNo">163</span><a name="line.163"></a>
-<span class="sourceLineNo">164</span> private static long getSegmentsHeapSize(List<? extends Segment> list) {<a name="line.164"></a>
-<span class="sourceLineNo">165</span> long res = 0;<a name="line.165"></a>
-<span class="sourceLineNo">166</span> for (Segment segment : list) {<a name="line.166"></a>
-<span class="sourceLineNo">167</span> res += segment.heapSize();<a name="line.167"></a>
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-<span class="sourceLineNo">169</span> return res;<a name="line.169"></a>
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-<span class="sourceLineNo">171</span><a name="line.171"></a>
-<span class="sourceLineNo">172</span> private static long getSegmentsOffHeapSize(List<? extends Segment> list) {<a name="line.172"></a>
-<span class="sourceLineNo">173</span> long res = 0;<a name="line.173"></a>
-<span class="sourceLineNo">174</span> for (Segment segment : list) {<a name="line.174"></a>
-<span class="sourceLineNo">175</span> res += segment.offHeapSize();<a name="line.175"></a>
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-<span class="sourceLineNo">177</span> return res;<a name="line.177"></a>
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-<span class="sourceLineNo">179</span><a name="line.179"></a>
-<span class="sourceLineNo">180</span> private static long getSegmentsKeySize(List<? extends Segment> list) {<a name="line.180"></a>
-<span class="sourceLineNo">181</span> long res = 0;<a name="line.181"></a>
-<span class="sourceLineNo">182</span> for (Segment segment : list) {<a name="line.182"></a>
-<span class="sourceLineNo">183</span> res += segment.keySize();<a name="line.183"></a>
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-<span class="sourceLineNo">185</span> return res;<a name="line.185"></a>
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-<span class="sourceLineNo">187</span><a name="line.187"></a>
-<span class="sourceLineNo">188</span> /**<a name="line.188"></a>
-<span class="sourceLineNo">189</span> * If the caller holds the current version, go over the the pipeline and try to flatten each<a name="line.189"></a>
-<span class="sourceLineNo">190</span> * segment. Flattening is replacing the ConcurrentSkipListMap based CellSet to CellArrayMap based.<a name="line.190"></a>
-<span class="sourceLineNo">191</span> * Flattening of the segment that initially is not based on ConcurrentSkipListMap has no effect.<a name="line.191"></a>
-<span class="sourceLineNo">192</span> * Return after one segment is successfully flatten.<a name="line.192"></a>
-<span class="sourceLineNo">193</span> *<a name="line.193"></a>
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-<span class="sourceLineNo">198</span> MemStoreCompactionStrategy.Action action) {<a name="line.198"></a>
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-<span class="sourceLineNo">200</span> if(requesterVersion != version) {<a name="line.200"></a>
-<span class="sourceLineNo">201</span> LOG.warn("Segment flattening failed, because versions do not match. Requester version: "<a name="line.201"></a>
-<span class="sourceLineNo">202</span> + requesterVersion + ", actual version: " + version);<a name="line.202"></a>
-<span class="sourceLineNo">203</span> return false;<a name="line.203"></a>
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-<span class="sourceLineNo">206</span> synchronized (pipeline){<a name="line.206"></a>
-<span class="sourceLineNo">207</span> if(requesterVersion != version) {<a name="line.207"></a>
-<span class="sourceLineNo">208</span> LOG.warn("Segment flattening failed, because versions do not match");<a name="line.208"></a>
-<span class="sourceLineNo">209</span> return false;<a name="line.209"></a>
-<span class="sourceLineNo">210</span> }<a name="line.210"></a>
-<span class="sourceLineNo">211</span> int i = 0;<a name="line.211"></a>
-<span class="sourceLineNo">212</span> for (ImmutableSegment s : pipeline) {<a name="line.212"></a>
-<span class="sourceLineNo">213</span> if ( s.canBeFlattened() ) {<a name="line.213"></a>
-<span class="sourceLineNo">214</span> MemStoreSizing newMemstoreAccounting = new MemStoreSizing(); // the size to be updated<a name="line.214"></a>
-<span class="sourceLineNo">215</span> ImmutableSegment newS = SegmentFactory.instance().createImmutableSegmentByFlattening(<a name="line.215"></a>
-<span class="sourceLineNo">216</span> (CSLMImmutableSegment)s,idxType,newMemstoreAccounting,action);<a name="line.216"></a>
-<span class="sourceLineNo">217</span> replaceAtIndex(i,newS);<a name="line.217"></a>
-<span class="sourceLineNo">218</span> if(region != null) {<a name="line.218"></a>
-<span class="sourceLineNo">219</span> // update the global memstore size counter<a name="line.219"></a>
-<span class="sourceLineNo">220</span> // upon flattening there is no change in the data size<a name="line.220"></a>
-<span class="sourceLineNo">221</span> region.addMemStoreSize(new MemStoreSize(0, newMemstoreAccounting.getHeapSize(),<a name="line.221"></a>
-<span class="sourceLineNo">222</span> newMemstoreAccounting.getOffHeapSize()));<a name="line.222"></a>
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-<span class="sourceLineNo">224</span> LOG.debug("Compaction pipeline segment {} flattened", s);<a name="line.224"></a>
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-<span class="sourceLineNo">227</span> i++;<a name="line.227"></a>
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-<span class="sourceLineNo">229</span><a name="line.229"></a>
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-<span class="sourceLineNo">232</span> // because all the cells remain in place<a name="line.232"></a>
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-<span class="sourceLineNo">243</span><a name="line.243"></a>
-<span class="sourceLineNo">244</span> public long size() {<a name="line.244"></a>
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-<span class="sourceLineNo">247</span><a name="line.247"></a>
-<span class="sourceLineNo">248</span> public long getMinSequenceId() {<a name="line.248"></a>
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-<span class="sourceLineNo">251</span> if (!localCopy.isEmpty()) {<a name="line.251"></a>
-<span class="sourceLineNo">252</span> minSequenceId = localCopy.getLast().getMinSequenceId();<a name="line.252"></a>
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-<span class="sourceLineNo">254</span> return minSequenceId;<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> public MemStoreSizing getTailSizing() {<a name="line.257"></a>
-<span class="sourceLineNo">258</span> LinkedList<? extends Segment> localCopy = readOnlyCopy;<a name="line.258"></a>
-<span class="sourceLineNo">259</span> if (localCopy.isEmpty()) return new MemStoreSizing();<a name="line.259"></a>
-<span class="sourceLineNo">260</span> return new MemStoreSizing(localCopy.peekLast().getMemStoreSize());<a name="line.260"></a>
-<span class="sourceLineNo">261</span> }<a name="line.261"></a>
-<span class="sourceLineNo">262</span><a name="line.262"></a>
-<span class="sourceLineNo">263</span> public MemStoreSizing getPipelineSizing() {<a name="line.263"></a>
-<span class="sourceLineNo">264</span> MemStoreSizing memStoreSizing = new MemStoreSizing();<a name="line.264"></a>
-<span class="sourceLineNo">265</span> LinkedList<? extends Segment> localCopy = readOnlyCopy;<a name="line.265"></a>
-<span class="sourceLineNo">266</span> for (Segment segment : localCopy) {<a name="line.266"></a>
-<span class="sourceLineNo">267</span> memStoreSizing.incMemStoreSize(segment.getMemStoreSize());<a name="line.267"></a>
-<span class="sourceLineNo">268</span> }<a name="line.268"></a>
-<span class="sourceLineNo">269</span> return memStoreSizing;<a name="line.269"></a>
-<span class="sourceLineNo">270</span> }<a name="line.270"></a>
-<span class="sourceLineNo">271</span><a name="line.271"></a>
-<span class="sourceLineNo">272</span> private void swapSuffix(List<? extends Segment> suffix, ImmutableSegment segment,<a name="line.272"></a>
-<span class="sourceLineNo">273</span> boolean closeSegmentsInSuffix) {<a name="line.273"></a>
-<span class="sourceLineNo">274</span> pipeline.removeAll(suffix);<a name="line.274"></a>
-<span class="sourceLineNo">275</span> if(segment != null) pipeline.addLast(segment);<a name="line.275"></a>
-<span class="sourceLineNo">276</span> // During index merge we won't be closing the segments undergoing the merge. Segment#close()<a name="line.276"></a>
-<span class="sourceLineNo">277</span> // will release the MSLAB chunks to pool. But in case of index merge there wont be any data copy<a name="line.277"></a>
-<span class="sourceLineNo">278</span> // from old MSLABs. So the new cells in new segment also refers to same chunks. In case of data<a name="line.278"></a>
-<span class="sourceLineNo">279</span> // compaction, we would have copied the cells data from old MSLAB chunks into a new chunk<a name="line.279"></a>
-<span class="sourceLineNo">280</span> // created for the result segment. So we can release the chunks associated with the compacted<a name="line.280"></a>
-<span class="sourceLineNo">281</span> // segments.<a name="line.281"></a>
-<span class="sourceLineNo">282</span> if (closeSegmentsInSuffix) {<a name="line.282"></a>
-<span class="sourceLineNo">283</span> for (Segment itemInSuffix : suffix) {<a name="line.283"></a>
-<span class="sourceLineNo">284</span> itemInSuffix.close();<a name="line.284"></a>
-<span class="sourceLineNo">285</span> }<a name="line.285"></a>
-<span class="sourceLineNo">286</span> }<a name="line.286"></a>
-<span class="sourceLineNo">287</span> }<a name="line.287"></a>
-<span class="sourceLineNo">288</span><a name="line.288"></a>
-<span class="sourceLineNo">289</span> // replacing one segment in the pipeline with a new one exactly at the same index<a name="line.289"></a>
-<span class="sourceLineNo">290</span> // need to be called only within synchronized block<a name="line.290"></a>
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-<span class="sourceLineNo">292</span> justification="replaceAtIndex is invoked under a synchronize block so safe")<a name="line.292"></a>
-<span class="sourceLineNo">293</span> private void replaceAtIndex(int idx, ImmutableSegment newSegment) {<a name="line.293"></a>
-<span class="sourceLineNo">294</span> pipeline.set(idx, newSegment);<a name="line.294"></a>
-<span class="sourceLineNo">295</span> readOnlyCopy = new LinkedList<>(pipeline);<a name="line.295"></a>
-<span class="sourceLineNo">296</span> // the version increment is indeed needed, because the swap uses removeAll() method of the<a name="line.296"></a>
-<span class="sourceLineNo">297</span> // linked-list that compares the objects to find what to remove.<a name="line.297"></a>
-<span class="sourceLineNo">298</span> // The flattening changes the segment object completely (creation pattern) and so<a name="line.298"></a>
-<span class="sourceLineNo">299</span> // swap will not proceed correctly after concurrent flattening.<a name="line.299"></a>
-<span class="sourceLineNo">300</span> version++;<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> public Segment getTail() {<a name="line.303"></a>
-<span class="sourceLineNo">304</span> List<? extends Segment> localCopy = getSegments();<a name="line.304"></a>
-<span class="sourceLineNo">305</span> if(localCopy.isEmpty()) {<a name="line.305"></a>
-<span class="sourceLineNo">306</span> return null;<a name="line.306"></a>
-<span class="sourceLineNo">307</span> }<a name="line.307"></a>
-<span class="sourceLineNo">308</span> return localCopy.get(localCopy.size() - 1);<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> private boolean addFirst(ImmutableSegment segment) {<a name="line.311"></a>
-<span class="sourceLineNo">312</span> pipeline.addFirst(segment);<a name="line.312"></a>
-<span class="sourceLineNo">313</span> return true;<a name="line.313"></a>
-<span class="sourceLineNo">314</span> }<a name="line.314"></a>
-<span class="sourceLineNo">315</span><a name="line.315"></a>
-<span class="sourceLineNo">316</span> // debug method<a name="line.316"></a>
-<span class="sourceLineNo">317</span> private boolean validateSuffixList(LinkedList<ImmutableSegment> suffix) {<a name="line.317"></a>
-<span class="sourceLineNo">318</span> if(suffix.isEmpty()) {<a name="line.318"></a>
-<span class="sourceLineNo">319</span> // empty suffix is always valid<a name="line.319"></a>
-<span class="sourceLineNo">320</span> return true;<a name="line.320"></a>
-<span class="sourceLineNo">321</span> }<a name="line.321"></a>
-<span class="sourceLineNo">322</span> Iterator<ImmutableSegment> pipelineBackwardIterator = pipeline.descendingIterator();<a name="line.322"></a>
-<span class="sourceLineNo">323</span> Iterator<ImmutableSegment> suffixBackwardIterator = suffix.descendingIterator();<a name="line.323"></a>
-<span class="sourceLineNo">324</span> ImmutableSegment suffixCurrent;<a name="line.324"></a>
-<span class="sourceLineNo">325</span> ImmutableSegment pipelineCurrent;<a name="line.325"></a>
-<span class="sourceLineNo">326</span> for( ; suffixBackwardIterator.hasNext(); ) {<a name="line.326"></a>
-<span class="sourceLineNo">327</span> if(!pipelineBackwardIterator.hasNext()) {<a name="line.327"></a>
-<span class="sourceLineNo">328</span> // a suffix longer than pipeline is invalid<a name="line.328"></a>
-<span class="sourceLineNo">329</span> return false;<a name="line.329"></a>
-<span class="sourceLineNo">330</span> }<a name="line.330"></a>
-<span class="sourceLineNo">331</span> suffixCurrent = suffixBackwardIterator.next();<a name="line.331"></a>
-<span class="sourceLineNo">332</span> pipelineCurrent = pipelineBackwardIterator.next();<a name="line.332"></a>
-<span class="sourceLineNo">333</span> if(suffixCurrent != pipelineCurrent) {<a name="line.333"></a>
-<span class="sourceLineNo">334</span> // non-matching suffix<a name="line.334"></a>
-<span class="sourceLineNo">335</span> return false;<a name="line.335"></a>
-<span class="sourceLineNo">336</span> }<a name="line.336"></a>
-<span class="sourceLineNo">337</span> }<a name="line.337"></a>
-<span class="sourceLineNo">338</span> // suffix matches pipeline suffix<a name="line.338"></a>
-<span class="sourceLineNo">339</span> return true;<a name="line.339"></a>
-<span class="sourceLineNo">340</span> }<a name="line.340"></a>
-<span class="sourceLineNo">341</span><a name="line.341"></a>
-<span class="sourceLineNo">342</span>}<a name="line.342"></a>
+<span class="sourceLineNo">026</span>import org.apache.hbase.thirdparty.com.google.common.base.Preconditions;<a name="line.26"></a>
+<span class="sourceLineNo">027</span>import org.apache.hadoop.hbase.util.Bytes;<a name="line.27"></a>
+<span class="sourceLineNo">028</span>import org.apache.hadoop.hbase.util.ClassSize;<a name="line.28"></a>
+<span class="sourceLineNo">029</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.29"></a>
+<span class="sourceLineNo">030</span>import org.slf4j.Logger;<a name="line.30"></a>
+<span class="sourceLineNo">031</span>import org.slf4j.LoggerFactory;<a name="line.31"></a>
+<span class="sourceLineNo">032</span><a name="line.32"></a>
+<span class="sourceLineNo">033</span>/**<a name="line.33"></a>
+<span class="sourceLineNo">034</span> * The compaction pipeline of a {@link CompactingMemStore}, is a FIFO queue of segments.<a name="line.34"></a>
+<span class="sourceLineNo">035</span> * It supports pushing a segment at the head of the pipeline and removing a segment from the<a name="line.35"></a>
+<span class="sourceLineNo">036</span> * tail when it is flushed to disk.<a name="line.36"></a>
+<span class="sourceLineNo">037</span> * It also supports swap method to allow the in-memory compaction swap a subset of the segments<a name="line.37"></a>
+<span class="sourceLineNo">038</span> * at the tail of the pipeline with a new (compacted) one. This swap succeeds only if the version<a name="line.38"></a>
+<span class="sourceLineNo">039</span> * number passed with the list of segments to swap is the same as the current version of the<a name="line.39"></a>
+<span class="sourceLineNo">040</span> * pipeline.<a name="line.40"></a>
+<span class="sourceLineNo">041</span> * Essentially, there are two methods which can change the structure of the pipeline: pushHead()<a name="line.41"></a>
+<span class="sourceLineNo">042</span> * and swap(), the later is used both by a flush to disk and by an in-memory compaction.<a name="line.42"></a>
+<span class="sourceLineNo">043</span> * The pipeline version is updated by swap(); it allows to identify conflicting operations at the<a name="line.43"></a>
+<span class="sourceLineNo">044</span> * suffix of the pipeline.<a name="line.44"></a>
+<span class="sourceLineNo">045</span> *<a name="line.45"></a>
+<span class="sourceLineNo">046</span> * The synchronization model is copy-on-write. Methods which change the structure of the<a name="line.46"></a>
+<span class="sourceLineNo">047</span> * pipeline (pushHead(), flattenOneSegment() and swap()) apply their changes in the context of a<a name="line.47"></a>
+<span class="sourceLineNo">048</span> * lock. They also make a read-only copy of the pipeline's list. Read methods read from a<a name="line.48"></a>
+<span class="sourceLineNo">049</span> * read-only copy. If a read method accesses the read-only copy more than once it makes a local<a name="line.49"></a>
+<span class="sourceLineNo">050</span> * copy of it to ensure it accesses the same copy.<a name="line.50"></a>
+<span class="sourceLineNo">051</span> *<a name="line.51"></a>
+<span class="sourceLineNo">052</span> * The methods getVersionedList(), getVersionedTail(), and flattenOneSegment() are also<a name="line.52"></a>
+<span class="sourceLineNo">053</span> * protected by a lock since they need to have a consistent (atomic) view of the pipeline list<a name="line.53"></a>
+<span class="sourceLineNo">054</span> * and version number.<a name="line.54"></a>
+<span class="sourceLineNo">055</span> */<a name="line.55"></a>
+<span class="sourceLineNo">056</span>@InterfaceAudience.Private<a name="line.56"></a>
+<span class="sourceLineNo">057</span>public class CompactionPipeline {<a name="line.57"></a>
+<span class="sourceLineNo">058</span> private static final Logger LOG = LoggerFactory.getLogger(CompactionPipeline.class);<a name="line.58"></a>
+<span class="sourceLineNo">059</span><a name="line.59"></a>
+<span class="sourceLineNo">060</span> public final static long FIXED_OVERHEAD = ClassSize<a name="line.60"></a>
+<span class="sourceLineNo">061</span> .align(ClassSize.OBJECT + (3 * ClassSize.REFERENCE) + Bytes.SIZEOF_LONG);<a name="line.61"></a>
+<span class="sourceLineNo">062</span> public final static long DEEP_OVERHEAD = FIXED_OVERHEAD + (2 * ClassSize.LINKEDLIST);<a name="line.62"></a>
+<span class="sourceLineNo">063</span><a name="line.63"></a>
+<span class="sourceLineNo">064</span> private final RegionServicesForStores region;<a name="line.64"></a>
+<span class="sourceLineNo">065</span> private final LinkedList<ImmutableSegment> pipeline = new LinkedList<>();<a name="line.65"></a>
+<span class="sourceLineNo">066</span> // The list is volatile to avoid reading a new allocated reference before the c'tor is executed<a name="line.66"></a>
+<span class="sourceLineNo">067</span> private volatile LinkedList<ImmutableSegment> readOnlyCopy = new LinkedList<>();<a name="line.67"></a>
+<span class="sourceLineNo">068</span> // Version is volatile to ensure it is atomically read when not using a lock<a name="line.68"></a>
+<span class="sourceLineNo">069</span> private volatile long version = 0;<a name="line.69"></a>
+<span class="sourceLineNo">070</span><a name="line.70"></a>
+<span class="sourceLineNo">071</span> public CompactionPipeline(RegionServicesForStores region) {<a name="line.71"></a>
+<span class="sourceLineNo">072</span> this.region = region;<a name="line.72"></a>
+<span class="sourceLineNo">073</span> }<a name="line.73"></a>
+<span class="sourceLineNo">074</span><a name="line.74"></a>
+<span class="sourceLineNo">075</span> public boolean pushHead(MutableSegment segment) {<a name="line.75"></a>
+<span class="sourceLineNo">076</span> ImmutableSegment immutableSegment = SegmentFactory.instance().<a name="line.76"></a>
+<span class="sourceLineNo">077</span> createImmutableSegment(segment);<a name="line.77"></a>
+<span class="sourceLineNo">078</span> synchronized (pipeline){<a name="line.78"></a>
+<span class="sourceLineNo">079</span> boolean res = addFirst(immutableSegment);<a name="line.79"></a>
+<span class="sourceLineNo">080</span> readOnlyCopy = new LinkedList<>(pipeline);<a name="line.80"></a>
+<span class="sourceLineNo">081</span> return res;<a name="line.81"></a>
+<span class="sourceLineNo">082</span> }<a name="line.82"></a>
+<span class="sourceLineNo">083</span> }<a name="line.83"></a>
+<span class="sourceLineNo">084</span><a name="line.84"></a>
+<span class="sourceLineNo">085</span> public VersionedSegmentsList getVersionedList() {<a name="line.85"></a>
+<span class="sourceLineNo">086</span> synchronized (pipeline){<a name="line.86"></a>
+<span class="sourceLineNo">087</span> return new VersionedSegmentsList(readOnlyCopy, version);<a name="line.87"></a>
+<span class="sourceLineNo">088</span> }<a name="line.88"></a>
+<span class="sourceLineNo">089</span> }<a name="line.89"></a>
+<span class="sourceLineNo">090</span><a name="line.90"></a>
+<span class="sourceLineNo">091</span> public VersionedSegmentsList getVersionedTail() {<a name="line.91"></a>
+<span class="sourceLineNo">092</span> synchronized (pipeline){<a name="line.92"></a>
+<span class="sourceLineNo">093</span> List<ImmutableSegment> segmentList = new ArrayList<>();<a name="line.93"></a>
+<span class="sourceLineNo">094</span> if(!pipeline.isEmpty()) {<a name="line.94"></a>
+<span class="sourceLineNo">095</span> segmentList.add(0, pipeline.getLast());<a name="line.95"></a>
+<span class="sourceLineNo">096</span> }<a name="line.96"></a>
+<span class="sourceLineNo">097</span> return new VersionedSegmentsList(segmentList, version);<a name="line.97"></a>
+<span class="sourceLineNo">098</span> }<a name="line.98"></a>
+<span class="sourceLineNo">099</span> }<a name="line.99"></a>
+<span class="sourceLineNo">100</span><a name="line.100"></a>
+<span class="sourceLineNo">101</span> /**<a name="line.101"></a>
+<span class="sourceLineNo">102</span> * Swaps the versioned list at the tail of the pipeline with a new segment.<a name="line.102"></a>
+<span class="sourceLineNo">103</span> * Swapping only if there were no changes to the suffix of the list since the version list was<a name="line.103"></a>
+<span class="sourceLineNo">104</span> * created.<a name="line.104"></a>
+<span class="sourceLineNo">105</span> * @param versionedList suffix of the pipeline to be replaced can be tail or all the pipeline<a name="line.105"></a>
+<span class="sourceLineNo">106</span> * @param segment new segment to replace the suffix. Can be null if the suffix just needs to be<a name="line.106"></a>
+<span class="sourceLineNo">107</span> * removed.<a name="line.107"></a>
+<span class="sourceLineNo">108</span> * @param closeSuffix whether to close the suffix (to release memory), as part of swapping it out<a name="line.108"></a>
+<span class="sourceLineNo">109</span> * During index merge op this will be false and for compaction it will be true.<a name="line.109"></a>
+<span class="sourceLineNo">110</span> * @param updateRegionSize whether to update the region size. Update the region size,<a name="line.110"></a>
+<span class="sourceLineNo">111</span> * when the pipeline is swapped as part of in-memory-flush and<a name="line.111"></a>
+<span class="sourceLineNo">112</span> * further merge/compaction. Don't update the region size when the<a name="line.112"></a>
+<span class="sourceLineNo">113</span> * swap is result of the snapshot (flush-to-disk).<a name="line.113"></a>
+<span class="sourceLineNo">114</span> * @return true iff swapped tail with new segment<a name="line.114"></a>
+<span class="sourceLineNo">115</span> */<a name="line.115"></a>
+<span class="sourceLineNo">116</span> @edu.umd.cs.findbugs.annotations.SuppressWarnings(value="VO_VOLATILE_INCREMENT",<a name="line.116"></a>
+<span class="sourceLineNo">117</span> justification="Increment is done under a synchronize block so safe")<a name="line.117"></a>
+<span class="sourceLineNo">118</span> public boolean swap(VersionedSegmentsList versionedList, ImmutableSegment segment,<a name="line.118"></a>
+<span class="sourceLineNo">119</span> boolean closeSuffix, boolean updateRegionSize) {<a name="line.119"></a>
+<span class="sourceLineNo">120</span> if (versionedList.getVersion() != version) {<a name="line.120"></a>
+<span class="sourceLineNo">121</span> return false;<a name="line.121"></a>
+<span class="sourceLineNo">122</span> }<a name="line.122"></a>
+<span class="sourceLineNo">123</span> List<ImmutableSegment> suffix;<a name="line.123"></a>
+<span class="sourceLineNo">124</span> synchronized (pipeline){<a name="line.124"></a>
+<span class="sourceLineNo">125</span> if(versionedList.getVersion() != version) {<a name="line.125"></a>
+<span class="sourceLineNo">126</span> return false;<a name="line.126"></a>
+<span class="sourceLineNo">127</span> }<a name="line.127"></a>
+<span class="sourceLineNo">128</span> suffix = versionedList.getStoreSegments();<a name="line.128"></a>
+<span class="sourceLineNo">129</span> LOG.debug("Swapping pipeline suffix; before={}, new segment={}",<a name="line.129"></a>
+<span class="sourceLineNo">130</span> versionedList.getStoreSegments().size(), segment);<a name="line.130"></a>
+<span class="sourceLineNo">131</span> swapSuffix(suffix, segment, closeSuffix);<a name="line.131"></a>
+<span class="sourceLineNo">132</span> readOnlyCopy = new LinkedList<>(pipeline);<a name="line.132"></a>
+<span class="sourceLineNo">133</span> version++;<a name="line.133"></a>
+<span class="sourceLineNo">134</span> }<a name="line.134"></a>
+<span class="sourceLineNo">135</span> if (updateRegionSize && region != null) {<a name="line.135"></a>
+<span class="sourceLineNo">136</span> // update the global memstore size counter<a name="line.136"></a>
+<span class="sourceLineNo">137</span> long suffixDataSize = getSegmentsKeySize(suffix);<a name="line.137"></a>
+<span class="sourceLineNo">138</span> long newDataSize = 0;<a name="line.138"></a>
+<span class="sourceLineNo">139</span> if(segment != null) {<a name="line.139"></a>
+<span class="sourceLineNo">140</span> newDataSize = segment.getDataSize();<a name="line.140"></a>
+<span class="sourceLineNo">141</span> }<a name="line.141"></a>
+<span class="sourceLineNo">142</span> long dataSizeDelta = suffixDataSize - newDataSize;<a name="line.142"></a>
+<span class="sourceLineNo">143</span> long suffixHeapSize = getSegmentsHeapSize(suffix);<a name="line.143"></a>
+<span class="sourceLineNo">144</span> long suffixOffHeapSize = getSegmentsOffHeapSize(suffix);<a name="line.144"></a>
+<span class="sourceLineNo">145</span> long newHeapSize = 0;<a name="line.145"></a>
+<span class="sourceLineNo">146</span> long newOffHeapSize = 0;<a name="line.146"></a>
+<span class="sourceLineNo">147</span> if(segment != null) {<a name="line.147"></a>
+<span class="sourceLineNo">148</span> newHeapSize = segment.getHeapSize();<a name="line.148"></a>
+<span class="sourceLineNo">149</span> newOffHeapSize = segment.getOffHeapSize();<a name="line.149"></a>
+<span class="sourceLineNo">150</span> }<a name="line.150"></a>
+<span class="sourceLineNo">151</span> long offHeapSizeDelta = suffixOffHeapSize - newOffHeapSize;<a name="line.151"></a>
+<span class="sourceLineNo">152</span> long heapSizeDelta = suffixHeapSize - newHeapSize;<a name="line.152"></a>
+<span class="sourceLineNo">153</span> region.addMemStoreSize(-dataSizeDelta, -heapSizeDelta, -offHeapSizeDelta);<a name="line.153"></a>
+<span class="sourceLineNo">154</span> LOG.debug("Suffix data size={}, new segment data size={}, "<a name="line.154"></a>
+<span class="sourceLineNo">155</span> + "suffix heap size={}," + "new segment heap size={}"<a name="line.155"></a>
+<span class="sourceLineNo">156</span> + "suffix off heap size={}," + "new segment off heap size={}"<a name="line.156"></a>
+<span class="sourceLineNo">157</span> , suffixDataSize<a name="line.157"></a>
+<span class="sourceLineNo">158</span> , newDataSize<a name="line.158"></a>
+<span class="sourceLineNo">159</span> , suffixHeapSize<a name="line.159"></a>
+<span class="sourceLineNo">160</span> , newHeapSize<a name="line.160"></a>
+<span class="sourceLineNo">161</span> , suffixOffHeapSize<a name="line.161"></a>
+<span class="sourceLineNo">162</span> , newOffHeapSize);<a name="line.162"></a>
+<span class="sourceLineNo">163</span> }<a name="line.163"></a>
+<span class="sourceLineNo">164</span> return true;<a name="line.164"></a>
+<span class="sourceLineNo">165</span> }<a name="line.165"></a>
+<span class="sourceLineNo">166</span><a name="line.166"></a>
+<span class="sourceLineNo">167</span> private static long getSegmentsHeapSize(List<? extends Segment> list) {<a name="line.167"></a>
+<span class="sourceLineNo">168</span> long res = 0;<a name="line.168"></a>
+<span class="sourceLineNo">169</span> for (Segment segment : list) {<a name="line.169"></a>
+<span class="sourceLineNo">170</span> res += segment.getHeapSize();<a name="line.170"></a>
+<span class="sourceLineNo">171</span> }<a name="line.171"></a>
+<span class="sourceLineNo">172</span> return res;<a name="line.172"></a>
+<span class="sourceLineNo">173</span> }<a name="line.173"></a>
+<span class="sourceLineNo">174</span><a name="line.174"></a>
+<span class="sourceLineNo">175</span> private static long getSegmentsOffHeapSize(List<? extends Segment> list) {<a name="line.175"></a>
+<span class="sourceLineNo">176</span> long res = 0;<a name="line.176"></a>
+<span class="sourceLineNo">177</span> for (Segment segment : list) {<a name="line.177"></a>
+<span class="sourceLineNo">178</span> res += segment.getOffHeapSize();<a name="line.178"></a>
+<span class="sourceLineNo">179</span> }<a name="line.179"></a>
+<span class="sourceLineNo">180</span> return res;<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> private static long getSegmentsKeySize(List<? extends Segment> list) {<a name="line.183"></a>
+<span class="sourceLineNo">184</span> long res = 0;<a name="line.184"></a>
+<span class="sourceLineNo">185</span> for (Segment segment : list) {<a name="line.185"></a>
+<span class="sourceLineNo">186</span> res += segment.getDataSize();<a name="line.186"></a>
+<span class="sourceLineNo">187</span> }<a name="line.187"></a>
+<span class="sourceLineNo">188</span> return res;<a name="line.188"></a>
+<span class="sourceLineNo">189</span> }<a name="line.189"></a>
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+<span class="sourceLineNo">191</span> /**<a name="line.191"></a>
+<span class="sourceLineNo">192</span> * If the caller holds the current version, go over the the pipeline and try to flatten each<a name="line.192"></a>
+<span class="sourceLineNo">193</span> * segment. Flattening is replacing the ConcurrentSkipListMap based CellSet to CellArrayMap based.<a name="line.193"></a>
+<span class="sourceLineNo">194</span> * Flattening of the segment that initially is not based on ConcurrentSkipListMap has no effect.<a name="line.194"></a>
+<span class="sourceLineNo">195</span> * Return after one segment is successfully flatten.<a name="line.195"></a>
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+<span class="sourceLineNo">197</span> * @return true iff a segment was successfully flattened<a name="line.197"></a>
+<span class="sourceLineNo">198</span> */<a name="line.198"></a>
+<span class="sourceLineNo">199</span> public boolean flattenOneSegment(long requesterVersion,<a name="line.199"></a>
+<span class="sourceLineNo">200</span> CompactingMemStore.IndexType idxType,<a name="line.200"></a>
+<span class="sourceLineNo">201</span> MemStoreCompactionStrategy.Action action) {<a name="line.201"></a>
+<span class="sourceLineNo">202</span><a name="line.202"></a>
+<span class="sourceLineNo">203</span> if(requesterVersion != version) {<a name="line.203"></a>
+<span class="sourceLineNo">204</span> LOG.warn("Segment flattening failed, because versions do not match. Requester version: "<a name="line.204"></a>
+<span class="sourceLineNo">205</span> + requesterVersion + ", actual version: " + version);<a name="line.205"></a>
+<span class="sourceLineNo">206</span> return false;<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> synchronized (pipeline){<a name="line.209"></a>
+<span class="sourceLineNo">210</span> if(requesterVersion != version) {<a name="line.210"></a>
+<span class="sourceLineNo">211</span> LOG.warn("Segment flattening failed, because versions do not match");<a name="line.211"></a>
+<span class="sourceLineNo">212</span> return false;<a name="line.212"></a>
+<span class="sourceLineNo">213</span> }<a name="line.213"></a>
+<span class="sourceLineNo">214</span> int i = 0;<a name="line.214"></a>
+<span class="sourceLineNo">215</span> for (ImmutableSegment s : pipeline) {<a name="line.215"></a>
+<span class="sourceLineNo">216</span> if ( s.canBeFlattened() ) {<a name="line.216"></a>
+<span class="sourceLineNo">217</span> // size to be updated<a name="line.217"></a>
+<span class="sourceLineNo">218</span> MemStoreSizing newMemstoreAccounting = new NonThreadSafeMemStoreSizing();<a name="line.218"></a>
+<span class="sourceLineNo">219</span> ImmutableSegment newS = SegmentFactory.instance().createImmutableSegmentByFlattening(<a name="line.219"></a>
+<span class="sourceLineNo">220</span> (CSLMImmutableSegment)s,idxType,newMemstoreAccounting,action);<a name="line.220"></a>
+<span class="sourceLineNo">221</span> replaceAtIndex(i,newS);<a name="line.221"></a>
+<span class="sourceLineNo">222</span> if(region != null) {<a name="line.222"></a>
+<span class="sourceLineNo">223</span> // Update the global memstore size counter upon flattening there is no change in the<a name="line.223"></a>
+<span class="sourceLineNo">224</span> // data size<a name="line.224"></a>
+<span class="sourceLineNo">225</span> MemStoreSize mss = newMemstoreAccounting.getMemStoreSize();<a name="line.225"></a>
+<span class="sourceLineNo">226</span> Preconditions.checkArgument(mss.getDataSize() == 0, "Not zero!");<a name="line.226"></a>
+<span class="sourceLineNo">227</span> region.addMemStoreSize(mss.getDataSize(), mss.getHeapSize(), mss.getOffHeapSize());<a name="line.227"></a>
+<span class="sourceLineNo">228</span> }<a name="line.228"></a>
+<span class="sourceLineNo">229</span> LOG.debug("Compaction pipeline segment {} flattened", s);<a name="line.229"></a>
+<span class="sourceLineNo">230</span> return true;<a name="line.230"></a>
+<span class="sourceLineNo">231</span> }<a name="line.231"></a>
+<span class="sourceLineNo">232</span> i++;<a name="line.232"></a>
+<span class="sourceLineNo">233</span> }<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> // do not update the global memstore size counter and do not increase the version,<a name="line.236"></a>
+<span class="sourceLineNo">237</span> // because all the cells remain in place<a name="line.237"></a>
+<span class="sourceLineNo">238</span> return false;<a name="line.238"></a>
+<span class="sourceLineNo">239</span> }<a name="line.239"></a>
+<span class="sourceLineNo">240</span><a name="line.240"></a>
+<span class="sourceLineNo">241</span> public boolean isEmpty() {<a name="line.241"></a>
+<span class="sourceLineNo">242</span> return readOnlyCopy.isEmpty();<a name="line.242"></a>
+<span class="sourceLineNo">243</span> }<a name="line.243"></a>
+<span class="sourceLineNo">244</span><a name="line.244"></a>
+<span class="sourceLineNo">245</span> public List<? extends Segment> getSegments() {<a name="line.245"></a>
+<span class="sourceLineNo">246</span> return readOnlyCopy;<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> public long size() {<a name="line.249"></a>
+<span class="sourceLineNo">250</span> return readOnlyCopy.size();<a name="line.250"></a>
+<span class="sourceLineNo">251</span> }<a name="line.251"></a>
+<span class="sourceLineNo">252</span><a name="line.252"></a>
+<span class="sourceLineNo">253</span> public long getMinSequenceId() {<a name="line.253"></a>
+<span class="sourceLineNo">254</span> long minSequenceId = Long.MAX_VALUE;<a name="line.254"></a>
+<span class="sourceLineNo">255</span> LinkedList<? extends Segment> localCopy = readOnlyCopy;<a name="line.255"></a>
+<span class="sourceLineNo">256</span> if (!localCopy.isEmpty()) {<a name="line.256"></a>
+<span class="sourceLineNo">257</span> minSequenceId = localCopy.getLast().getMinSequenceId();<a name="line.257"></a>
+<span class="sourceLineNo">258</span> }<a name="line.258"></a>
+<span class="sourceLineNo">259</span> return minSequenceId;<a name="line.259"></a>
+<span class="sourceLineNo">260</span> }<a name="line.260"></a>
+<span class="sourceLineNo">261</span><a name="line.261"></a>
+<span class="sourceLineNo">262</span> public MemStoreSize getTailSize() {<a name="line.262"></a>
+<span class="sourceLineNo">263</span> LinkedList<? extends Segment> localCopy = readOnlyCopy;<a name="line.263"></a>
+<span class="sourceLineNo">264</span> return localCopy.isEmpty()? new MemStoreSize(): localCopy.peekLast().getMemStoreSize();<a name="line.264"></a>
+<span class="sourceLineNo">265</span> }<a name="line.265"></a>
+<span class="sourceLineNo">266</span><a name="line.266"></a>
+<span class="sourceLineNo">267</span> public MemStoreSize getPipelineSize() {<a name="line.267"></a>
+<span class="sourceLineNo">268</span> MemStoreSizing memStoreSizing = new NonThreadSafeMemStoreSizing();<a name="line.268"></a>
+<span class="sourceLineNo">269</span> LinkedList<? extends Segment> localCopy = readOnlyCopy;<a name="line.269"></a>
+<span class="sourceLineNo">270</span> for (Segment segment : localCopy) {<a name="line.270"></a>
+<span class="sourceLineNo">271</span> memStoreSizing.incMemStoreSize(segment.getMemStoreSize());<a name="line.271"></a>
+<span class="sourceLineNo">272</span> }<a name="line.272"></a>
+<span class="sourceLineNo">273</span> return memStoreSizing.getMemStoreSize();<a name="line.273"></a>
+<span class="sourceLineNo">274</span> }<a name="line.274"></a>
+<span class="sourceLineNo">275</span><a name="line.275"></a>
+<span class="sourceLineNo">276</span> private void swapSuffix(List<? extends Segment> suffix, ImmutableSegment segment,<a name="line.276"></a>
+<span class="sourceLineNo">277</span> boolean closeSegmentsInSuffix) {<a name="line.277"></a>
+<span class="sourceLineNo">278</span> pipeline.removeAll(suffix);<a name="line.278"></a>
+<span class="sourceLineNo">279</span> if(segment != null) pipeline.addLast(segment);<a name="line.279"></a>
+<span class="sourceLineNo">280</span> // During index merge we won't be closing the segments undergoing the merge. Segment#close()<a name="line.280"></a>
+<span class="sourceLineNo">281</span> // will release the MSLAB chunks to pool. But in case of index merge there wont be any data copy<a name="line.281"></a>
+<span class="sourceLineNo">282</span> // from old MSLABs. So the new cells in new segment also refers to same chunks. In case of data<a name="line.282"></a>
+<span class="sourceLineNo">283</span> // compaction, we would have copied the cells data from old MSLAB chunks into a new chunk<a name="line.283"></a>
+<span class="sourceLineNo">284</span> // created for the result segment. So we can release the chunks associated with the compacted<a name="line.284"></a>
+<span class="sourceLineNo">285</span> // segments.<a name="line.285"></a>
+<span class="sourceLineNo">286</span> if (closeSegmentsInSuffix) {<a name="line.286"></a>
+<span class="sourceLineNo">287</span> for (Segment itemInSuffix : suffix) {<a name="line.287"></a>
+<span class="sourceLineNo">288</span> itemInSuffix.close();<a name="line.288"></a>
+<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> }<a name="line.291"></a>
+<span class="sourceLineNo">292</span><a name="line.292"></a>
+<span class="sourceLineNo">293</span> // replacing one segment in the pipeline with a new one exactly at the same index<a name="line.293"></a>
+<span class="sourceLineNo">294</span> // need to be called only within synchronized block<a name="line.294"></a>
+<span class="sourceLineNo">295</span> @edu.umd.cs.findbugs.annotations.SuppressWarnings(value="VO_VOLATILE_INCREMENT",<a name="line.295"></a>
+<span class="sourceLineNo">296</span> justification="replaceAtIndex is invoked under a synchronize block so safe")<a name="line.296"></a>
+<span class="sourceLineNo">297</span> private void replaceAtIndex(int idx, ImmutableSegment newSegment) {<a name="line.297"></a>
+<span class="sourceLineNo">298</span> pipeline.set(idx, newSegment);<a name="line.298"></a>
+<span class="sourceLineNo">299</span> readOnlyCopy = new LinkedList<>(pipeline);<a name="line.299"></a>
+<span class="sourceLineNo">300</span> // the version increment is indeed needed, because the swap uses removeAll() method of the<a name="line.300"></a>
+<span class="sourceLineNo">301</span> // linked-list that compares the objects to find what to remove.<a name="line.301"></a>
+<span class="sourceLineNo">302</span> // The flattening changes the segment object completely (creation pattern) and so<a name="line.302"></a>
+<span class="sourceLineNo">303</span> // swap will not proceed correctly after concurrent flattening.<a name="line.303"></a>
+<span class="sourceLineNo">304</span> version++;<a name="line.304"></a>
+<span class="sourceLineNo">305</span> }<a name="line.305"></a>
+<span class="sourceLineNo">306</span><a name="line.306"></a>
+<span class="sourceLineNo">307</span> public Segment getTail() {<a name="line.307"></a>
+<span class="sourceLineNo">308</span> List<? extends Segment> localCopy = getSegments();<a name="line.308"></a>
+<span class="sourceLineNo">309</span> if(localCopy.isEmpty()) {<a name="line.309"></a>
+<span class="sourceLineNo">310</span> return null;<a name="line.310"></a>
+<span class="sourceLineNo">311</span> }<a name="line.311"></a>
+<span class="sourceLineNo">312</span> return localCopy.get(localCopy.size() - 1);<a name="line.312"></a>
+<span class="sourceLineNo">313</span> }<a name="line.313"></a>
+<span class="sourceLineNo">314</span><a name="line.314"></a>
+<span class="sourceLineNo">315</span> private boolean addFirst(ImmutableSegment segment) {<a name="line.315"></a>
+<span class="sourceLineNo">316</span> pipeline.addFirst(segment);<a name="line.316"></a>
+<span class="sourceLineNo">317</span> return true;<a name="line.317"></a>
+<span class="sourceLineNo">318</span> }<a name="line.318"></a>
+<span class="sourceLineNo">319</span><a name="line.319"></a>
+<span class="sourceLineNo">320</span> // debug method<a name="line.320"></a>
+<span class="sourceLineNo">321</span> private boolean validateSuffixList(LinkedList<ImmutableSegment> suffix) {<a name="line.321"></a>
+<span class="sourceLineNo">322</span> if(suffix.isEmpty()) {<a name="line.322"></a>
+<span class="sourceLineNo">323</span> // empty suffix is always valid<a name="line.323"></a>
+<span class="sourceLineNo">324</span> return true;<a name="line.324"></a>
+<span class="sourceLineNo">325</span> }<a name="line.325"></a>
+<span class="sourceLineNo">326</span> Iterator<ImmutableSegment> pipelineBackwardIterator = pipeline.descendingIterator();<a name="line.326"></a>
+<span class="sourceLineNo">327</span> Iterator<ImmutableSegment> suffixBackwardIterator = suffix.descendingIterator();<a name="line.327"></a>
+<span class="sourceLineNo">328</span> ImmutableSegment suffixCurrent;<a name="line.328"></a>
+<span class="sourceLineNo">329</span> ImmutableSegment pipelineCurrent;<a name="line.329"></a>
+<span class="sourceLineNo">330</span> for( ; suffixBackwardIterator.hasNext(); ) {<a name="line.330"></a>
+<span class="sourceLineNo">331</span> if(!pipelineBackwardIterator.hasNext()) {<a name="line.331"></a>
+<span class="sourceLineNo">332</span> // a suffix longer than pipeline is invalid<a name="line.332"></a>
+<span class="sourceLineNo">333</span> return false;<a name="line.333"></a>
+<span class="sourceLineNo">334</span> }<a name="line.334"></a>
+<span class="sourceLineNo">335</span> suffixCurrent = suffixBackwardIterator.next();<a name="line.335"></a>
+<span class="sourceLineNo">336</span> pipelineCurrent = pipelineBackwardIterator.next();<a name="line.336"></a>
+<span class="sourceLineNo">337</span> if(suffixCurrent != pipelineCurrent) {<a name="line.337"></a>
+<span class="sourceLineNo">338</span> // non-matching suffix<a name="line.338"></a>
+<span class="sourceLineNo">339</span> return false;<a name="line.339"></a>
+<span class="sourceLineNo">340</span> }<a name="line.340"></a>
+<span class="sourceLineNo">341</span> }<a name="line.341"></a>
+<span class="sourceLineNo">342</span> // suffix matches pipeline suffix<a name="line.342"></a>
+<span class="sourceLineNo">343</span> return true;<a name="line.343"></a>
+<span class="sourceLineNo">344</span> }<a name="line.344"></a>
+<span class="sourceLineNo">345</span><a name="line.345"></a>
+<span class="sourceLineNo">346</span>}<a name="line.346"></a>
http://git-wip-us.apache.org/repos/asf/hbase-site/blob/92a26cfb/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/CompositeImmutableSegment.html
----------------------------------------------------------------------
diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/CompositeImmutableSegment.html b/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/CompositeImmutableSegment.html
index 90d50ec..6a8a474 100644
--- a/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/CompositeImmutableSegment.html
+++ b/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/CompositeImmutableSegment.html
@@ -56,7 +56,7 @@
<span class="sourceLineNo">048</span> for (ImmutableSegment s : segments) {<a name="line.48"></a>
<span class="sourceLineNo">049</span> this.timeRangeTracker.includeTimestamp(s.getTimeRangeTracker().getMax());<a name="line.49"></a>
<span class="sourceLineNo">050</span> this.timeRangeTracker.includeTimestamp(s.getTimeRangeTracker().getMin());<a name="line.50"></a>
-<span class="sourceLineNo">051</span> this.keySize += s.keySize();<a name="line.51"></a>
+<span class="sourceLineNo">051</span> this.keySize += s.getDataSize();<a name="line.51"></a>
<span class="sourceLineNo">052</span> }<a name="line.52"></a>
<span class="sourceLineNo">053</span> }<a name="line.53"></a>
<span class="sourceLineNo">054</span><a name="line.54"></a>
@@ -178,7 +178,7 @@
<span class="sourceLineNo">170</span> * @return Sum of all cell sizes.<a name="line.170"></a>
<span class="sourceLineNo">171</span> */<a name="line.171"></a>
<span class="sourceLineNo">172</span> @Override<a name="line.172"></a>
-<span class="sourceLineNo">173</span> public long keySize() {<a name="line.173"></a>
+<span class="sourceLineNo">173</span> public long getDataSize() {<a name="line.173"></a>
<span class="sourceLineNo">174</span> return this.keySize;<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>
@@ -186,10 +186,10 @@
<span class="sourceLineNo">178</span> * @return The heap size of this segment.<a name="line.178"></a>
<span class="sourceLineNo">179</span> */<a name="line.179"></a>
<span class="sourceLineNo">180</span> @Override<a name="line.180"></a>
-<span class="sourceLineNo">181</span> public long heapSize() {<a name="line.181"></a>
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<span class="sourceLineNo">187</span> }<a name="line.187"></a>
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<span class="sourceLineNo">190</span> * Updates the heap size counter of the segment by the given delta<a name="line.190"></a>
<span class="sourceLineNo">191</span> */<a name="line.191"></a>
<span class="sourceLineNo">192</span> @Override<a name="line.192"></a>
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<span class="sourceLineNo">195</span> }<a name="line.195"></a>
<span class="sourceLineNo">196</span><a name="line.196"></a>