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Posted to commits@hbase.apache.org by gi...@apache.org on 2018/02/02 15:13:52 UTC
[13/51] [partial] hbase-site git commit: Published site at .
http://git-wip-us.apache.org/repos/asf/hbase-site/blob/1f2eeb22/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.html
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diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.html b/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.html
index b7c24d7..eecd2f9 100644
--- a/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.html
+++ b/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.html
@@ -44,792 +44,792 @@
<span class="sourceLineNo">036</span>import java.util.List;<a name="line.36"></a>
<span class="sourceLineNo">037</span>import java.util.Map;<a name="line.37"></a>
<span class="sourceLineNo">038</span>import java.util.NavigableSet;<a name="line.38"></a>
-<span class="sourceLineNo">039</span>import java.util.Objects;<a name="line.39"></a>
-<span class="sourceLineNo">040</span>import java.util.PriorityQueue;<a name="line.40"></a>
-<span class="sourceLineNo">041</span>import java.util.Set;<a name="line.41"></a>
-<span class="sourceLineNo">042</span>import java.util.concurrent.ArrayBlockingQueue;<a name="line.42"></a>
-<span class="sourceLineNo">043</span>import java.util.concurrent.BlockingQueue;<a name="line.43"></a>
-<span class="sourceLineNo">044</span>import java.util.concurrent.ConcurrentHashMap;<a name="line.44"></a>
-<span class="sourceLineNo">045</span>import java.util.concurrent.ConcurrentMap;<a name="line.45"></a>
-<span class="sourceLineNo">046</span>import java.util.concurrent.ConcurrentSkipListSet;<a name="line.46"></a>
-<span class="sourceLineNo">047</span>import java.util.concurrent.Executors;<a name="line.47"></a>
-<span class="sourceLineNo">048</span>import java.util.concurrent.ScheduledExecutorService;<a name="line.48"></a>
-<span class="sourceLineNo">049</span>import java.util.concurrent.TimeUnit;<a name="line.49"></a>
-<span class="sourceLineNo">050</span>import java.util.concurrent.atomic.AtomicInteger;<a name="line.50"></a>
-<span class="sourceLineNo">051</span>import java.util.concurrent.atomic.AtomicLong;<a name="line.51"></a>
-<span class="sourceLineNo">052</span>import java.util.concurrent.atomic.LongAdder;<a name="line.52"></a>
-<span class="sourceLineNo">053</span>import java.util.concurrent.locks.Lock;<a name="line.53"></a>
-<span class="sourceLineNo">054</span>import java.util.concurrent.locks.ReentrantLock;<a name="line.54"></a>
-<span class="sourceLineNo">055</span>import java.util.concurrent.locks.ReentrantReadWriteLock;<a name="line.55"></a>
-<span class="sourceLineNo">056</span>import org.apache.hadoop.conf.Configuration;<a name="line.56"></a>
-<span class="sourceLineNo">057</span>import org.apache.hadoop.hbase.HBaseConfiguration;<a name="line.57"></a>
-<span class="sourceLineNo">058</span>import org.apache.hadoop.hbase.io.HeapSize;<a name="line.58"></a>
-<span class="sourceLineNo">059</span>import org.apache.hadoop.hbase.io.hfile.BlockCache;<a name="line.59"></a>
-<span class="sourceLineNo">060</span>import org.apache.hadoop.hbase.io.hfile.BlockCacheKey;<a name="line.60"></a>
-<span class="sourceLineNo">061</span>import org.apache.hadoop.hbase.io.hfile.BlockCacheUtil;<a name="line.61"></a>
-<span class="sourceLineNo">062</span>import org.apache.hadoop.hbase.io.hfile.BlockPriority;<a name="line.62"></a>
-<span class="sourceLineNo">063</span>import org.apache.hadoop.hbase.io.hfile.BlockType;<a name="line.63"></a>
-<span class="sourceLineNo">064</span>import org.apache.hadoop.hbase.io.hfile.CacheStats;<a name="line.64"></a>
-<span class="sourceLineNo">065</span>import org.apache.hadoop.hbase.io.hfile.Cacheable;<a name="line.65"></a>
-<span class="sourceLineNo">066</span>import org.apache.hadoop.hbase.io.hfile.Cacheable.MemoryType;<a name="line.66"></a>
-<span class="sourceLineNo">067</span>import org.apache.hadoop.hbase.io.hfile.CacheableDeserializer;<a name="line.67"></a>
-<span class="sourceLineNo">068</span>import org.apache.hadoop.hbase.io.hfile.CacheableDeserializerIdManager;<a name="line.68"></a>
-<span class="sourceLineNo">069</span>import org.apache.hadoop.hbase.io.hfile.CachedBlock;<a name="line.69"></a>
-<span class="sourceLineNo">070</span>import org.apache.hadoop.hbase.io.hfile.HFileBlock;<a name="line.70"></a>
-<span class="sourceLineNo">071</span>import org.apache.hadoop.hbase.nio.ByteBuff;<a name="line.71"></a>
-<span class="sourceLineNo">072</span>import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;<a name="line.72"></a>
-<span class="sourceLineNo">073</span>import org.apache.hadoop.hbase.util.HasThread;<a name="line.73"></a>
-<span class="sourceLineNo">074</span>import org.apache.hadoop.hbase.util.IdReadWriteLock;<a name="line.74"></a>
-<span class="sourceLineNo">075</span>import org.apache.hadoop.hbase.util.IdReadWriteLock.ReferenceType;<a name="line.75"></a>
-<span class="sourceLineNo">076</span>import org.apache.hadoop.util.StringUtils;<a name="line.76"></a>
-<span class="sourceLineNo">077</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.77"></a>
-<span class="sourceLineNo">078</span>import org.slf4j.Logger;<a name="line.78"></a>
-<span class="sourceLineNo">079</span>import org.slf4j.LoggerFactory;<a name="line.79"></a>
-<span class="sourceLineNo">080</span><a name="line.80"></a>
-<span class="sourceLineNo">081</span>import org.apache.hbase.thirdparty.com.google.common.annotations.VisibleForTesting;<a name="line.81"></a>
-<span class="sourceLineNo">082</span>import org.apache.hbase.thirdparty.com.google.common.base.Preconditions;<a name="line.82"></a>
-<span class="sourceLineNo">083</span>import org.apache.hbase.thirdparty.com.google.common.util.concurrent.ThreadFactoryBuilder;<a name="line.83"></a>
-<span class="sourceLineNo">084</span><a name="line.84"></a>
-<span class="sourceLineNo">085</span>/**<a name="line.85"></a>
-<span class="sourceLineNo">086</span> * BucketCache uses {@link BucketAllocator} to allocate/free blocks, and uses<a name="line.86"></a>
-<span class="sourceLineNo">087</span> * BucketCache#ramCache and BucketCache#backingMap in order to<a name="line.87"></a>
-<span class="sourceLineNo">088</span> * determine if a given element is in the cache. The bucket cache can use on-heap or<a name="line.88"></a>
-<span class="sourceLineNo">089</span> * off-heap memory {@link ByteBufferIOEngine} or in a file {@link FileIOEngine} to<a name="line.89"></a>
-<span class="sourceLineNo">090</span> * store/read the block data.<a name="line.90"></a>
-<span class="sourceLineNo">091</span> *<a name="line.91"></a>
-<span class="sourceLineNo">092</span> * <p>Eviction is via a similar algorithm as used in<a name="line.92"></a>
-<span class="sourceLineNo">093</span> * {@link org.apache.hadoop.hbase.io.hfile.LruBlockCache}<a name="line.93"></a>
-<span class="sourceLineNo">094</span> *<a name="line.94"></a>
-<span class="sourceLineNo">095</span> * <p>BucketCache can be used as mainly a block cache (see<a name="line.95"></a>
-<span class="sourceLineNo">096</span> * {@link org.apache.hadoop.hbase.io.hfile.CombinedBlockCache}), combined with<a name="line.96"></a>
-<span class="sourceLineNo">097</span> * LruBlockCache to decrease CMS GC and heap fragmentation.<a name="line.97"></a>
-<span class="sourceLineNo">098</span> *<a name="line.98"></a>
-<span class="sourceLineNo">099</span> * <p>It also can be used as a secondary cache (e.g. using a file on ssd/fusionio to store<a name="line.99"></a>
-<span class="sourceLineNo">100</span> * blocks) to enlarge cache space via<a name="line.100"></a>
-<span class="sourceLineNo">101</span> * {@link org.apache.hadoop.hbase.io.hfile.LruBlockCache#setVictimCache}<a name="line.101"></a>
-<span class="sourceLineNo">102</span> */<a name="line.102"></a>
-<span class="sourceLineNo">103</span>@InterfaceAudience.Private<a name="line.103"></a>
-<span class="sourceLineNo">104</span>public class BucketCache implements BlockCache, HeapSize {<a name="line.104"></a>
-<span class="sourceLineNo">105</span> private static final Logger LOG = LoggerFactory.getLogger(BucketCache.class);<a name="line.105"></a>
-<span class="sourceLineNo">106</span><a name="line.106"></a>
-<span class="sourceLineNo">107</span> /** Priority buckets config */<a name="line.107"></a>
-<span class="sourceLineNo">108</span> static final String SINGLE_FACTOR_CONFIG_NAME = "hbase.bucketcache.single.factor";<a name="line.108"></a>
-<span class="sourceLineNo">109</span> static final String MULTI_FACTOR_CONFIG_NAME = "hbase.bucketcache.multi.factor";<a name="line.109"></a>
-<span class="sourceLineNo">110</span> static final String MEMORY_FACTOR_CONFIG_NAME = "hbase.bucketcache.memory.factor";<a name="line.110"></a>
-<span class="sourceLineNo">111</span> static final String EXTRA_FREE_FACTOR_CONFIG_NAME = "hbase.bucketcache.extrafreefactor";<a name="line.111"></a>
-<span class="sourceLineNo">112</span> static final String ACCEPT_FACTOR_CONFIG_NAME = "hbase.bucketcache.acceptfactor";<a name="line.112"></a>
-<span class="sourceLineNo">113</span> static final String MIN_FACTOR_CONFIG_NAME = "hbase.bucketcache.minfactor";<a name="line.113"></a>
-<span class="sourceLineNo">114</span><a name="line.114"></a>
-<span class="sourceLineNo">115</span> /** Priority buckets */<a name="line.115"></a>
-<span class="sourceLineNo">116</span> @VisibleForTesting<a name="line.116"></a>
-<span class="sourceLineNo">117</span> static final float DEFAULT_SINGLE_FACTOR = 0.25f;<a name="line.117"></a>
-<span class="sourceLineNo">118</span> static final float DEFAULT_MULTI_FACTOR = 0.50f;<a name="line.118"></a>
-<span class="sourceLineNo">119</span> static final float DEFAULT_MEMORY_FACTOR = 0.25f;<a name="line.119"></a>
-<span class="sourceLineNo">120</span> static final float DEFAULT_MIN_FACTOR = 0.85f;<a name="line.120"></a>
-<span class="sourceLineNo">121</span><a name="line.121"></a>
-<span class="sourceLineNo">122</span> private static final float DEFAULT_EXTRA_FREE_FACTOR = 0.10f;<a name="line.122"></a>
-<span class="sourceLineNo">123</span> private static final float DEFAULT_ACCEPT_FACTOR = 0.95f;<a name="line.123"></a>
-<span class="sourceLineNo">124</span><a name="line.124"></a>
-<span class="sourceLineNo">125</span> // Number of blocks to clear for each of the bucket size that is full<a name="line.125"></a>
-<span class="sourceLineNo">126</span> private static final int DEFAULT_FREE_ENTIRE_BLOCK_FACTOR = 2;<a name="line.126"></a>
-<span class="sourceLineNo">127</span><a name="line.127"></a>
-<span class="sourceLineNo">128</span> /** Statistics thread */<a name="line.128"></a>
-<span class="sourceLineNo">129</span> private static final int statThreadPeriod = 5 * 60;<a name="line.129"></a>
-<span class="sourceLineNo">130</span><a name="line.130"></a>
-<span class="sourceLineNo">131</span> final static int DEFAULT_WRITER_THREADS = 3;<a name="line.131"></a>
-<span class="sourceLineNo">132</span> final static int DEFAULT_WRITER_QUEUE_ITEMS = 64;<a name="line.132"></a>
-<span class="sourceLineNo">133</span><a name="line.133"></a>
-<span class="sourceLineNo">134</span> // Store/read block data<a name="line.134"></a>
-<span class="sourceLineNo">135</span> final IOEngine ioEngine;<a name="line.135"></a>
-<span class="sourceLineNo">136</span><a name="line.136"></a>
-<span class="sourceLineNo">137</span> // Store the block in this map before writing it to cache<a name="line.137"></a>
-<span class="sourceLineNo">138</span> @VisibleForTesting<a name="line.138"></a>
-<span class="sourceLineNo">139</span> final ConcurrentMap<BlockCacheKey, RAMQueueEntry> ramCache;<a name="line.139"></a>
-<span class="sourceLineNo">140</span> // In this map, store the block's meta data like offset, length<a name="line.140"></a>
-<span class="sourceLineNo">141</span> @VisibleForTesting<a name="line.141"></a>
-<span class="sourceLineNo">142</span> ConcurrentMap<BlockCacheKey, BucketEntry> backingMap;<a name="line.142"></a>
-<span class="sourceLineNo">143</span><a name="line.143"></a>
-<span class="sourceLineNo">144</span> /**<a name="line.144"></a>
-<span class="sourceLineNo">145</span> * Flag if the cache is enabled or not... We shut it off if there are IO<a name="line.145"></a>
-<span class="sourceLineNo">146</span> * errors for some time, so that Bucket IO exceptions/errors don't bring down<a name="line.146"></a>
-<span class="sourceLineNo">147</span> * the HBase server.<a name="line.147"></a>
-<span class="sourceLineNo">148</span> */<a name="line.148"></a>
-<span class="sourceLineNo">149</span> private volatile boolean cacheEnabled;<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> * A list of writer queues. We have a queue per {@link WriterThread} we have running.<a name="line.152"></a>
-<span class="sourceLineNo">153</span> * In other words, the work adding blocks to the BucketCache is divided up amongst the<a name="line.153"></a>
-<span class="sourceLineNo">154</span> * running WriterThreads. Its done by taking hash of the cache key modulo queue count.<a name="line.154"></a>
-<span class="sourceLineNo">155</span> * WriterThread when it runs takes whatever has been recently added and 'drains' the entries<a name="line.155"></a>
-<span class="sourceLineNo">156</span> * to the BucketCache. It then updates the ramCache and backingMap accordingly.<a name="line.156"></a>
-<span class="sourceLineNo">157</span> */<a name="line.157"></a>
-<span class="sourceLineNo">158</span> @VisibleForTesting<a name="line.158"></a>
-<span class="sourceLineNo">159</span> final ArrayList<BlockingQueue<RAMQueueEntry>> writerQueues = new ArrayList<>();<a name="line.159"></a>
-<span class="sourceLineNo">160</span> @VisibleForTesting<a name="line.160"></a>
-<span class="sourceLineNo">161</span> final WriterThread[] writerThreads;<a name="line.161"></a>
-<span class="sourceLineNo">162</span><a name="line.162"></a>
-<span class="sourceLineNo">163</span> /** Volatile boolean to track if free space is in process or not */<a name="line.163"></a>
-<span class="sourceLineNo">164</span> private volatile boolean freeInProgress = false;<a name="line.164"></a>
-<span class="sourceLineNo">165</span> private final Lock freeSpaceLock = new ReentrantLock();<a name="line.165"></a>
-<span class="sourceLineNo">166</span><a name="line.166"></a>
-<span class="sourceLineNo">167</span> private UniqueIndexMap<Integer> deserialiserMap = new UniqueIndexMap<>();<a name="line.167"></a>
-<span class="sourceLineNo">168</span><a name="line.168"></a>
-<span class="sourceLineNo">169</span> private final LongAdder realCacheSize = new LongAdder();<a name="line.169"></a>
-<span class="sourceLineNo">170</span> private final LongAdder heapSize = new LongAdder();<a name="line.170"></a>
-<span class="sourceLineNo">171</span> /** Current number of cached elements */<a name="line.171"></a>
-<span class="sourceLineNo">172</span> private final LongAdder blockNumber = new LongAdder();<a name="line.172"></a>
-<span class="sourceLineNo">173</span><a name="line.173"></a>
-<span class="sourceLineNo">174</span> /** Cache access count (sequential ID) */<a name="line.174"></a>
-<span class="sourceLineNo">175</span> private final AtomicLong accessCount = new AtomicLong();<a name="line.175"></a>
-<span class="sourceLineNo">176</span><a name="line.176"></a>
-<span class="sourceLineNo">177</span> private static final int DEFAULT_CACHE_WAIT_TIME = 50;<a name="line.177"></a>
-<span class="sourceLineNo">178</span> // Used in test now. If the flag is false and the cache speed is very fast,<a name="line.178"></a>
-<span class="sourceLineNo">179</span> // bucket cache will skip some blocks when caching. If the flag is true, we<a name="line.179"></a>
-<span class="sourceLineNo">180</span> // will wait blocks flushed to IOEngine for some time when caching<a name="line.180"></a>
-<span class="sourceLineNo">181</span> boolean wait_when_cache = false;<a name="line.181"></a>
-<span class="sourceLineNo">182</span><a name="line.182"></a>
-<span class="sourceLineNo">183</span> private final BucketCacheStats cacheStats = new BucketCacheStats();<a name="line.183"></a>
-<span class="sourceLineNo">184</span><a name="line.184"></a>
-<span class="sourceLineNo">185</span> private final String persistencePath;<a name="line.185"></a>
-<span class="sourceLineNo">186</span> private final long cacheCapacity;<a name="line.186"></a>
-<span class="sourceLineNo">187</span> /** Approximate block size */<a name="line.187"></a>
-<span class="sourceLineNo">188</span> private final long blockSize;<a name="line.188"></a>
-<span class="sourceLineNo">189</span><a name="line.189"></a>
-<span class="sourceLineNo">190</span> /** Duration of IO errors tolerated before we disable cache, 1 min as default */<a name="line.190"></a>
-<span class="sourceLineNo">191</span> private final int ioErrorsTolerationDuration;<a name="line.191"></a>
-<span class="sourceLineNo">192</span> // 1 min<a name="line.192"></a>
-<span class="sourceLineNo">193</span> public static final int DEFAULT_ERROR_TOLERATION_DURATION = 60 * 1000;<a name="line.193"></a>
-<span class="sourceLineNo">194</span><a name="line.194"></a>
-<span class="sourceLineNo">195</span> // Start time of first IO error when reading or writing IO Engine, it will be<a name="line.195"></a>
-<span class="sourceLineNo">196</span> // reset after a successful read/write.<a name="line.196"></a>
-<span class="sourceLineNo">197</span> private volatile long ioErrorStartTime = -1;<a name="line.197"></a>
-<span class="sourceLineNo">198</span><a name="line.198"></a>
-<span class="sourceLineNo">199</span> /**<a name="line.199"></a>
-<span class="sourceLineNo">200</span> * A ReentrantReadWriteLock to lock on a particular block identified by offset.<a name="line.200"></a>
-<span class="sourceLineNo">201</span> * The purpose of this is to avoid freeing the block which is being read.<a name="line.201"></a>
-<span class="sourceLineNo">202</span> * <p><a name="line.202"></a>
-<span class="sourceLineNo">203</span> * Key set of offsets in BucketCache is limited so soft reference is the best choice here.<a name="line.203"></a>
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-<span class="sourceLineNo">205</span> @VisibleForTesting<a name="line.205"></a>
-<span class="sourceLineNo">206</span> final IdReadWriteLock offsetLock = new IdReadWriteLock(ReferenceType.SOFT);<a name="line.206"></a>
-<span class="sourceLineNo">207</span><a name="line.207"></a>
-<span class="sourceLineNo">208</span> private final NavigableSet<BlockCacheKey> blocksByHFile =<a name="line.208"></a>
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-<span class="sourceLineNo">211</span> public int compare(BlockCacheKey a, BlockCacheKey b) {<a name="line.211"></a>
-<span class="sourceLineNo">212</span> int nameComparison = a.getHfileName().compareTo(b.getHfileName());<a name="line.212"></a>
-<span class="sourceLineNo">213</span> if (nameComparison != 0) {<a name="line.213"></a>
-<span class="sourceLineNo">214</span> return nameComparison;<a name="line.214"></a>
-<span class="sourceLineNo">215</span> }<a name="line.215"></a>
-<span class="sourceLineNo">216</span><a name="line.216"></a>
-<span class="sourceLineNo">217</span> if (a.getOffset() == b.getOffset()) {<a name="line.217"></a>
-<span class="sourceLineNo">218</span> return 0;<a name="line.218"></a>
-<span class="sourceLineNo">219</span> } else if (a.getOffset() < b.getOffset()) {<a name="line.219"></a>
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-<span class="sourceLineNo">228</span> new ThreadFactoryBuilder().setNameFormat("BucketCacheStatsExecutor").setDaemon(true).build());<a name="line.228"></a>
-<span class="sourceLineNo">229</span><a name="line.229"></a>
-<span class="sourceLineNo">230</span> // Allocate or free space for the block<a name="line.230"></a>
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-<span class="sourceLineNo">232</span><a name="line.232"></a>
-<span class="sourceLineNo">233</span> /** Acceptable size of cache (no evictions if size < acceptable) */<a name="line.233"></a>
-<span class="sourceLineNo">234</span> private float acceptableFactor;<a name="line.234"></a>
-<span class="sourceLineNo">235</span><a name="line.235"></a>
-<span class="sourceLineNo">236</span> /** Minimum threshold of cache (when evicting, evict until size < min) */<a name="line.236"></a>
-<span class="sourceLineNo">237</span> private float minFactor;<a name="line.237"></a>
-<span class="sourceLineNo">238</span><a name="line.238"></a>
-<span class="sourceLineNo">239</span> /** Free this floating point factor of extra blocks when evicting. For example free the number of blocks requested * (1 + extraFreeFactor) */<a name="line.239"></a>
-<span class="sourceLineNo">240</span> private float extraFreeFactor;<a name="line.240"></a>
-<span class="sourceLineNo">241</span><a name="line.241"></a>
-<span class="sourceLineNo">242</span> /** Single access bucket size */<a name="line.242"></a>
-<span class="sourceLineNo">243</span> private float singleFactor;<a name="line.243"></a>
-<span class="sourceLineNo">244</span><a name="line.244"></a>
-<span class="sourceLineNo">245</span> /** Multiple access bucket size */<a name="line.245"></a>
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-<span class="sourceLineNo">247</span><a name="line.247"></a>
-<span class="sourceLineNo">248</span> /** In-memory bucket size */<a name="line.248"></a>
-<span class="sourceLineNo">249</span> private float memoryFactor;<a name="line.249"></a>
-<span class="sourceLineNo">250</span><a name="line.250"></a>
-<span class="sourceLineNo">251</span> public BucketCache(String ioEngineName, long capacity, int blockSize, int[] bucketSizes,<a name="line.251"></a>
-<span class="sourceLineNo">252</span> int writerThreadNum, int writerQLen, String persistencePath) throws FileNotFoundException,<a name="line.252"></a>
-<span class="sourceLineNo">253</span> IOException {<a name="line.253"></a>
-<span class="sourceLineNo">254</span> this(ioEngineName, capacity, blockSize, bucketSizes, writerThreadNum, writerQLen,<a name="line.254"></a>
-<span class="sourceLineNo">255</span> persistencePath, DEFAULT_ERROR_TOLERATION_DURATION, HBaseConfiguration.create());<a name="line.255"></a>
-<span class="sourceLineNo">256</span> }<a name="line.256"></a>
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-<span class="sourceLineNo">772</span> bytesToFreeWithoutExtra += bytesToFreeForBucket[i];<a name="line.772"></a>
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-<span class="sourceLineNo">787</span> long totalSize = bucketAllocator.getTotalSize();<a name="line.787"></a>
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-<span class="sourceLineNo">789</span> LOG.debug("Free started because \"" + why + "\"; " + msgBuffer.toString() +<a name="line.789"></a>
-<span class="sourceLineNo">790</span> " of current used=" + StringUtils.byteDesc(currentSize) + ", actual cacheSize=" +<a name="line.790"></a>
-<span class="sourceLineNo">791</span> StringUtils.byteDesc(realCacheSize.sum()) + ", total=" + StringUtils.byteDesc(totalSize));<a name="line.791"></a>
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-<span class="sourceLineNo">795</span> * (1 + extraFreeFactor));<a name="line.795"></a>
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-<span class="sourceLineNo">797</span> // Instantiate priority buckets<a name="line.797"></a>
-<span class="sourceLineNo">798</span> BucketEntryGroup bucketSingle = new BucketEntryGroup(bytesToFreeWithExtra,<a name="line.798"></a>
-<span class="sourceLineNo">799</span> blockSize, getPartitionSize(singleFactor));<a name="line.799"></a>
-<span class="sourceLineNo">800</span> BucketEntryGroup bucketMulti = new BucketEntryGroup(bytesToFreeWithExtra,<a name="line.800"></a>
-<span class="sourceLineNo">801</span> blockSize, getPartitionSize(multiFactor));<a name="line.801"></a>
-<span class="sourceLineNo">802</span> BucketEntryGroup bucketMemory = new BucketEntryGroup(bytesToFreeWithExtra,<a name="line.802"></a>
-<span class="sourceLineNo">803</span> blockSize, getPartitionSize(memoryFactor));<a name="line.803"></a>
-<span class="sourceLineNo">804</span><a name="line.804"></a>
-<span class="sourceLineNo">805</span> // Scan entire map putting bucket entry into appropriate bucket entry<a name="line.805"></a>
-<span class="sourceLineNo">806</span> // group<a name="line.806"></a>
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-<span class="sourceLineNo">810</span> bucketSingle.add(bucketEntryWithKey);<a name="line.810"></a>
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-<span class="sourceLineNo">812</span> }<a name="line.812"></a>
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-<span class="sourceLineNo">814</span> bucketMulti.add(bucketEntryWithKey);<a name="line.814"></a>
-<span class="sourceLineNo">815</span> break;<a name="line.815"></a>
-<span class="sourceLineNo">816</span> }<a name="line.816"></a>
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-<span class="sourceLineNo">819</span> break;<a name="line.819"></a>
-<span class="sourceLineNo">820</span> }<a name="line.820"></a>
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-<span class="sourceLineNo">824</span> PriorityQueue<BucketEntryGroup> bucketQueue = new PriorityQueue<>(3);<a name="line.824"></a>
+<span class="sourceLineNo">039</span>import java.util.PriorityQueue;<a name="line.39"></a>
+<span class="sourceLineNo">040</span>import java.util.Set;<a name="line.40"></a>
+<span class="sourceLineNo">041</span>import java.util.concurrent.ArrayBlockingQueue;<a name="line.41"></a>
+<span class="sourceLineNo">042</span>import java.util.concurrent.BlockingQueue;<a name="line.42"></a>
+<span class="sourceLineNo">043</span>import java.util.concurrent.ConcurrentHashMap;<a name="line.43"></a>
+<span class="sourceLineNo">044</span>import java.util.concurrent.ConcurrentMap;<a name="line.44"></a>
+<span class="sourceLineNo">045</span>import java.util.concurrent.ConcurrentSkipListSet;<a name="line.45"></a>
+<span class="sourceLineNo">046</span>import java.util.concurrent.Executors;<a name="line.46"></a>
+<span class="sourceLineNo">047</span>import java.util.concurrent.ScheduledExecutorService;<a name="line.47"></a>
+<span class="sourceLineNo">048</span>import java.util.concurrent.TimeUnit;<a name="line.48"></a>
+<span class="sourceLineNo">049</span>import java.util.concurrent.atomic.AtomicInteger;<a name="line.49"></a>
+<span class="sourceLineNo">050</span>import java.util.concurrent.atomic.AtomicLong;<a name="line.50"></a>
+<span class="sourceLineNo">051</span>import java.util.concurrent.atomic.LongAdder;<a name="line.51"></a>
+<span class="sourceLineNo">052</span>import java.util.concurrent.locks.Lock;<a name="line.52"></a>
+<span class="sourceLineNo">053</span>import java.util.concurrent.locks.ReentrantLock;<a name="line.53"></a>
+<span class="sourceLineNo">054</span>import java.util.concurrent.locks.ReentrantReadWriteLock;<a name="line.54"></a>
+<span class="sourceLineNo">055</span>import org.apache.hadoop.conf.Configuration;<a name="line.55"></a>
+<span class="sourceLineNo">056</span>import org.apache.hadoop.hbase.HBaseConfiguration;<a name="line.56"></a>
+<span class="sourceLineNo">057</span>import org.apache.hadoop.hbase.io.HeapSize;<a name="line.57"></a>
+<span class="sourceLineNo">058</span>import org.apache.hadoop.hbase.io.hfile.BlockCache;<a name="line.58"></a>
+<span class="sourceLineNo">059</span>import org.apache.hadoop.hbase.io.hfile.BlockCacheKey;<a name="line.59"></a>
+<span class="sourceLineNo">060</span>import org.apache.hadoop.hbase.io.hfile.BlockCacheUtil;<a name="line.60"></a>
+<span class="sourceLineNo">061</span>import org.apache.hadoop.hbase.io.hfile.BlockPriority;<a name="line.61"></a>
+<span class="sourceLineNo">062</span>import org.apache.hadoop.hbase.io.hfile.BlockType;<a name="line.62"></a>
+<span class="sourceLineNo">063</span>import org.apache.hadoop.hbase.io.hfile.CacheStats;<a name="line.63"></a>
+<span class="sourceLineNo">064</span>import org.apache.hadoop.hbase.io.hfile.Cacheable;<a name="line.64"></a>
+<span class="sourceLineNo">065</span>import org.apache.hadoop.hbase.io.hfile.Cacheable.MemoryType;<a name="line.65"></a>
+<span class="sourceLineNo">066</span>import org.apache.hadoop.hbase.io.hfile.CacheableDeserializer;<a name="line.66"></a>
+<span class="sourceLineNo">067</span>import org.apache.hadoop.hbase.io.hfile.CacheableDeserializerIdManager;<a name="line.67"></a>
+<span class="sourceLineNo">068</span>import org.apache.hadoop.hbase.io.hfile.CachedBlock;<a name="line.68"></a>
+<span class="sourceLineNo">069</span>import org.apache.hadoop.hbase.io.hfile.HFileBlock;<a name="line.69"></a>
+<span class="sourceLineNo">070</span>import org.apache.hadoop.hbase.nio.ByteBuff;<a name="line.70"></a>
+<span class="sourceLineNo">071</span>import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;<a name="line.71"></a>
+<span class="sourceLineNo">072</span>import org.apache.hadoop.hbase.util.HasThread;<a name="line.72"></a>
+<span class="sourceLineNo">073</span>import org.apache.hadoop.hbase.util.IdReadWriteLock;<a name="line.73"></a>
+<span class="sourceLineNo">074</span>import org.apache.hadoop.hbase.util.IdReadWriteLock.ReferenceType;<a name="line.74"></a>
+<span class="sourceLineNo">075</span>import org.apache.hadoop.util.StringUtils;<a name="line.75"></a>
+<span class="sourceLineNo">076</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.76"></a>
+<span class="sourceLineNo">077</span>import org.slf4j.Logger;<a name="line.77"></a>
+<span class="sourceLineNo">078</span>import org.slf4j.LoggerFactory;<a name="line.78"></a>
+<span class="sourceLineNo">079</span><a name="line.79"></a>
+<span class="sourceLineNo">080</span>import org.apache.hbase.thirdparty.com.google.common.annotations.VisibleForTesting;<a name="line.80"></a>
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+<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> * BucketCache uses {@link BucketAllocator} to allocate/free blocks, and uses<a name="line.85"></a>
+<span class="sourceLineNo">086</span> * BucketCache#ramCache and BucketCache#backingMap in order to<a name="line.86"></a>
+<span class="sourceLineNo">087</span> * determine if a given element is in the cache. The bucket cache can use on-heap or<a name="line.87"></a>
+<span class="sourceLineNo">088</span> * off-heap memory {@link ByteBufferIOEngine} or in a file {@link FileIOEngine} to<a name="line.88"></a>
+<span class="sourceLineNo">089</span> * store/read the block data.<a name="line.89"></a>
+<span class="sourceLineNo">090</span> *<a name="line.90"></a>
+<span class="sourceLineNo">091</span> * <p>Eviction is via a similar algorithm as used in<a name="line.91"></a>
+<span class="sourceLineNo">092</span> * {@link org.apache.hadoop.hbase.io.hfile.LruBlockCache}<a name="line.92"></a>
+<span class="sourceLineNo">093</span> *<a name="line.93"></a>
+<span class="sourceLineNo">094</span> * <p>BucketCache can be used as mainly a block cache (see<a name="line.94"></a>
+<span class="sourceLineNo">095</span> * {@link org.apache.hadoop.hbase.io.hfile.CombinedBlockCache}), combined with<a name="line.95"></a>
+<span class="sourceLineNo">096</span> * LruBlockCache to decrease CMS GC and heap fragmentation.<a name="line.96"></a>
+<span class="sourceLineNo">097</span> *<a name="line.97"></a>
+<span class="sourceLineNo">098</span> * <p>It also can be used as a secondary cache (e.g. using a file on ssd/fusionio to store<a name="line.98"></a>
+<span class="sourceLineNo">099</span> * blocks) to enlarge cache space via<a name="line.99"></a>
+<span class="sourceLineNo">100</span> * {@link org.apache.hadoop.hbase.io.hfile.LruBlockCache#setVictimCache}<a name="line.100"></a>
+<span class="sourceLineNo">101</span> */<a name="line.101"></a>
+<span class="sourceLineNo">102</span>@InterfaceAudience.Private<a name="line.102"></a>
+<span class="sourceLineNo">103</span>public class BucketCache implements BlockCache, HeapSize {<a name="line.103"></a>
+<span class="sourceLineNo">104</span> private static final Logger LOG = LoggerFactory.getLogger(BucketCache.class);<a name="line.104"></a>
+<span class="sourceLineNo">105</span><a name="line.105"></a>
+<span class="sourceLineNo">106</span> /** Priority buckets config */<a name="line.106"></a>
+<span class="sourceLineNo">107</span> static final String SINGLE_FACTOR_CONFIG_NAME = "hbase.bucketcache.single.factor";<a name="line.107"></a>
+<span class="sourceLineNo">108</span> static final String MULTI_FACTOR_CONFIG_NAME = "hbase.bucketcache.multi.factor";<a name="line.108"></a>
+<span class="sourceLineNo">109</span> static final String MEMORY_FACTOR_CONFIG_NAME = "hbase.bucketcache.memory.factor";<a name="line.109"></a>
+<span class="sourceLineNo">110</span> static final String EXTRA_FREE_FACTOR_CONFIG_NAME = "hbase.bucketcache.extrafreefactor";<a name="line.110"></a>
+<span class="sourceLineNo">111</span> static final String ACCEPT_FACTOR_CONFIG_NAME = "hbase.bucketcache.acceptfactor";<a name="line.111"></a>
+<span class="sourceLineNo">112</span> static final String MIN_FACTOR_CONFIG_NAME = "hbase.bucketcache.minfactor";<a name="line.112"></a>
+<span class="sourceLineNo">113</span><a name="line.113"></a>
+<span class="sourceLineNo">114</span> /** Priority buckets */<a name="line.114"></a>
+<span class="sourceLineNo">115</span> @VisibleForTesting<a name="line.115"></a>
+<span class="sourceLineNo">116</span> static final float DEFAULT_SINGLE_FACTO
<TRUNCATED>