http://git-wip-us.apache.org/repos/asf/hbase-site/blob/f8d69509/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/LruBlockCache.html ---------------------------------------------------------------------- diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/LruBlockCache.html b/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/LruBlockCache.html index d4cbe00..01cdf64 100644 --- a/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/LruBlockCache.html +++ b/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/LruBlockCache.html @@ -446,685 +446,687 @@ <span class="sourceLineNo">438</span> boolean updateCacheMetrics) {<a name="line.438"></a> <span class="sourceLineNo">439</span> LruCachedBlock cb = map.get(cacheKey);<a name="line.439"></a> <span class="sourceLineNo">440</span> if (cb == null) {<a name="line.440"></a> -<span class="sourceLineNo">441</span> if (!repeat && updateCacheMetrics) stats.miss(caching, cacheKey.isPrimary());<a name="line.441"></a> -<span class="sourceLineNo">442</span> // If there is another block cache then try and read there.<a name="line.442"></a> -<span class="sourceLineNo">443</span> // However if this is a retry ( second time in double checked locking )<a name="line.443"></a> -<span class="sourceLineNo">444</span> // And it's already a miss then the l2 will also be a miss.<a name="line.444"></a> -<span class="sourceLineNo">445</span> if (victimHandler != null && !repeat) {<a name="line.445"></a> -<span class="sourceLineNo">446</span> Cacheable result = victimHandler.getBlock(cacheKey, caching, repeat, updateCacheMetrics);<a name="line.446"></a> -<span class="sourceLineNo">447</span><a name="line.447"></a> -<span class="sourceLineNo">448</span> // Promote this to L1.<a name="line.448"></a> -<span class="sourceLineNo">449</span> if (result != null && caching) {<a name="line.449"></a> -<span class="sourceLineNo">450</span> cacheBlock(cacheKey, result, /* inMemory = */ false, /* cacheData = */ true);<a name="line.450"></a> -<span class="sourceLineNo">451</span> }<a name="line.451"></a> -<span class="sourceLineNo">452</span> return result;<a name="line.452"></a> -<span class="sourceLineNo">453</span> }<a name="line.453"></a> -<span class="sourceLineNo">454</span> return null;<a name="line.454"></a> -<span class="sourceLineNo">455</span> }<a name="line.455"></a> -<span class="sourceLineNo">456</span> if (updateCacheMetrics) stats.hit(caching, cacheKey.isPrimary());<a name="line.456"></a> -<span class="sourceLineNo">457</span> cb.access(count.incrementAndGet());<a name="line.457"></a> -<span class="sourceLineNo">458</span> return cb.getBuffer();<a name="line.458"></a> -<span class="sourceLineNo">459</span> }<a name="line.459"></a> -<span class="sourceLineNo">460</span><a name="line.460"></a> -<span class="sourceLineNo">461</span> /**<a name="line.461"></a> -<span class="sourceLineNo">462</span> * Whether the cache contains block with specified cacheKey<a name="line.462"></a> -<span class="sourceLineNo">463</span> * @param cacheKey<a name="line.463"></a> -<span class="sourceLineNo">464</span> * @return true if contains the block<a name="line.464"></a> -<span class="sourceLineNo">465</span> */<a name="line.465"></a> -<span class="sourceLineNo">466</span> public boolean containsBlock(BlockCacheKey cacheKey) {<a name="line.466"></a> -<span class="sourceLineNo">467</span> return map.containsKey(cacheKey);<a name="line.467"></a> -<span class="sourceLineNo">468</span> }<a name="line.468"></a> -<span class="sourceLineNo">469</span><a name="line.469"></a> -<span class="sourceLineNo">470</span> @Override<a name="line.470"></a> -<span class="sourceLineNo">471</span> public boolean evictBlock(BlockCacheKey cacheKey) {<a name="line.471"></a> -<span class="sourceLineNo">472</span> LruCachedBlock cb = map.get(cacheKey);<a name="line.472"></a> -<span class="sourceLineNo">473</span> if (cb == null) return false;<a name="line.473"></a> -<span class="sourceLineNo">474</span> evictBlock(cb, false);<a name="line.474"></a> -<span class="sourceLineNo">475</span> return true;<a name="line.475"></a> -<span class="sourceLineNo">476</span> }<a name="line.476"></a> -<span class="sourceLineNo">477</span><a name="line.477"></a> -<span class="sourceLineNo">478</span> /**<a name="line.478"></a> -<span class="sourceLineNo">479</span> * Evicts all blocks for a specific HFile. 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class="sourceLineNo">572</span><a name="line.572"></a> -<span class="sourceLineNo">573</span> // Scan entire map putting into appropriate buckets<a name="line.573"></a> -<span class="sourceLineNo">574</span> for(LruCachedBlock cachedBlock : map.values()) {<a name="line.574"></a> -<span class="sourceLineNo">575</span> switch(cachedBlock.getPriority()) {<a name="line.575"></a> -<span class="sourceLineNo">576</span> case SINGLE: {<a name="line.576"></a> -<span class="sourceLineNo">577</span> bucketSingle.add(cachedBlock);<a name="line.577"></a> -<span class="sourceLineNo">578</span> break;<a name="line.578"></a> -<span class="sourceLineNo">579</span> }<a name="line.579"></a> -<span class="sourceLineNo">580</span> case MULTI: {<a name="line.580"></a> -<span class="sourceLineNo">581</span> bucketMulti.add(cachedBlock);<a name="line.581"></a> -<span class="sourceLineNo">582</span> break;<a name="line.582"></a> -<span class="sourceLineNo">583</span> }<a name="line.583"></a> -<span class="sourceLineNo">584</span> case MEMORY: {<a name="line.584"></a> -<span class="sourceLineNo">585</span> bucketMemory.add(cachedBlock);<a name="line.585"></a> -<span class="sourceLineNo">586</span> break;<a name="line.586"></a> -<span class="sourceLineNo">587</span> }<a name="line.587"></a> -<span class="sourceLineNo">588</span> }<a name="line.588"></a> -<span class="sourceLineNo">589</span> }<a name="line.589"></a> -<span class="sourceLineNo">590</span><a name="line.590"></a> -<span class="sourceLineNo">591</span> long bytesFreed = 0;<a name="line.591"></a> -<span class="sourceLineNo">592</span> if (forceInMemory || memoryFactor > 0.999f) {<a name="line.592"></a> -<span class="sourceLineNo">593</span> long s = bucketSingle.totalSize();<a name="line.593"></a> -<span class="sourceLineNo">594</span> long m = bucketMulti.totalSize();<a name="line.594"></a> -<span class="sourceLineNo">595</span> if (bytesToFree > (s + m)) {<a name="line.595"></a> -<span class="sourceLineNo">596</span> 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class="sourceLineNo">606</span> LOG.trace("freed " + StringUtils.byteDesc(bytesFreed) +<a name="line.606"></a> -<span class="sourceLineNo">607</span> " total from all three buckets ");<a name="line.607"></a> -<span class="sourceLineNo">608</span> }<a name="line.608"></a> -<span class="sourceLineNo">609</span> } else {<a name="line.609"></a> -<span class="sourceLineNo">610</span> // this means no need to evict block in memory bucket,<a name="line.610"></a> -<span class="sourceLineNo">611</span> // and we try best to make the ratio between single-bucket and<a name="line.611"></a> -<span class="sourceLineNo">612</span> // multi-bucket is 1:2<a name="line.612"></a> -<span class="sourceLineNo">613</span> long bytesRemain = s + m - bytesToFree;<a name="line.613"></a> -<span class="sourceLineNo">614</span> if (3 * s <= bytesRemain) {<a name="line.614"></a> -<span class="sourceLineNo">615</span> // single-bucket is small enough that no eviction happens for it<a name="line.615"></a> -<span class="sourceLineNo">616</span> // hence all eviction goes from multi-bucket<a name="line.616"></a> -<span class="sourceLineNo">617</span> bytesFreed = bucketMulti.free(bytesToFree);<a name="line.617"></a> -<span class="sourceLineNo">618</span> } else if (3 * m <= 2 * bytesRemain) {<a name="line.618"></a> -<span class="sourceLineNo">619</span> // multi-bucket is small enough that no eviction happens for it<a name="line.619"></a> -<span class="sourceLineNo">620</span> // hence all eviction goes from single-bucket<a name="line.620"></a> -<span class="sourceLineNo">621</span> bytesFreed = bucketSingle.free(bytesToFree);<a name="line.621"></a> -<span class="sourceLineNo">622</span> } else {<a name="line.622"></a> -<span class="sourceLineNo">623</span> // both buckets need to evict some blocks<a name="line.623"></a> -<span class="sourceLineNo">624</span> bytesFreed = bucketSingle.free(s - bytesRemain / 3);<a name="line.624"></a> -<span class="sourceLineNo">625</span> if (bytesFreed < bytesToFree) {<a name="line.625"></a> -<span class="sourceLineNo">626</span> bytesFreed += bucketMulti.free(bytesToFree - bytesFreed);<a name="line.626"></a> -<span class="sourceLineNo">627</span> }<a name="line.627"></a> -<span class="sourceLineNo">628</span> }<a name="line.628"></a> -<span class="sourceLineNo">629</span> }<a name="line.629"></a> -<span class="sourceLineNo">630</span> } else {<a name="line.630"></a> -<span class="sourceLineNo">631</span> PriorityQueue<BlockBucket> bucketQueue =<a name="line.631"></a> -<span class="sourceLineNo">632</span> new PriorityQueue<BlockBucket>(3);<a name="line.632"></a> -<span class="sourceLineNo">633</span><a name="line.633"></a> -<span class="sourceLineNo">634</span> bucketQueue.add(bucketSingle);<a name="line.634"></a> -<span class="sourceLineNo">635</span> bucketQueue.add(bucketMulti);<a name="line.635"></a> -<span class="sourceLineNo">636</span> bucketQueue.add(bucketMemory);<a name="line.636"></a> -<span class="sourceLineNo">637</span><a name="line.637"></a> -<span class="sourceLineNo">638</span> int remainingBuckets = 3;<a name="line.638"></a> +<span class="sourceLineNo">565</span> if(bytesToFree <= 0) return;<a name="line.565"></a> +<span class="sourceLineNo">566</span><a name="line.566"></a> +<span class="sourceLineNo">567</span> // Instantiate priority buckets<a name="line.567"></a> +<span class="sourceLineNo">568</span> BlockBucket bucketSingle = new BlockBucket("single", bytesToFree, blockSize,<a name="line.568"></a> +<span class="sourceLineNo">569</span> singleSize());<a name="line.569"></a> +<span class="sourceLineNo">570</span> BlockBucket bucketMulti = new BlockBucket("multi", bytesToFree, blockSize,<a name="line.570"></a> +<span class="sourceLineNo">571</span> multiSize());<a name="line.571"></a> +<span class="sourceLineNo">572</span> BlockBucket bucketMemory = new BlockBucket("memory", bytesToFree, blockSize,<a name="line.572"></a> +<span class="sourceLineNo">573</span> memorySize());<a name="line.573"></a> +<span class="sourceLineNo">574</span><a name="line.574"></a> +<span class="sourceLineNo">575</span> // Scan entire map putting into appropriate buckets<a name="line.575"></a> +<span class="sourceLineNo">576</span> for(LruCachedBlock cachedBlock : map.values()) {<a name="line.576"></a> +<span class="sourceLineNo">577</span> switch(cachedBlock.getPriority()) {<a name="line.577"></a> +<span class="sourceLineNo">578</span> case SINGLE: {<a name="line.578"></a> +<span class="sourceLineNo">579</span> bucketSingle.add(cachedBlock);<a name="line.579"></a> +<span class="sourceLineNo">580</span> break;<a name="line.580"></a> +<span class="sourceLineNo">581</span> }<a name="line.581"></a> +<span class="sourceLineNo">582</span> case MULTI: {<a name="line.582"></a> +<span class="sourceLineNo">583</span> bucketMulti.add(cachedBlock);<a name="line.583"></a> +<span class="sourceLineNo">584</span> break;<a name="line.584"></a> +<span class="sourceLineNo">585</span> }<a name="line.585"></a> +<span class="sourceLineNo">586</span> case MEMORY: {<a name="line.586"></a> +<span class="sourceLineNo">587</span> bucketMemory.add(cachedBlock);<a name="line.587"></a> +<span class="sourceLineNo">588</span> break;<a name="line.588"></a> +<span class="sourceLineNo">589</span> }<a name="line.589"></a> +<span class="sourceLineNo">590</span> }<a name="line.590"></a> +<span class="sourceLineNo">591</span> }<a name="line.591"></a> +<span class="sourceLineNo">592</span><a name="line.592"></a> +<span class="sourceLineNo">593</span> long bytesFreed = 0;<a name="line.593"></a> +<span class="sourceLineNo">594</span> if (forceInMemory || memoryFactor > 0.999f) {<a name="line.594"></a> +<span class="sourceLineNo">595</span> long s = bucketSingle.totalSize();<a name="line.595"></a> +<span class="sourceLineNo">596</span> long m = bucketMulti.totalSize();<a name="line.596"></a> +<span class="sourceLineNo">597</span> if (bytesToFree > (s + m)) {<a name="line.597"></a> +<span class="sourceLineNo">598</span> // this means we need to evict blocks in memory bucket to make room,<a name="line.598"></a> +<span class="sourceLineNo">599</span> // so the single and multi buckets will be emptied<a name="line.599"></a> +<span class="sourceLineNo">600</span> bytesFreed = bucketSingle.free(s);<a name="line.600"></a> +<span class="sourceLineNo">601</span> bytesFreed += bucketMulti.free(m);<a name="line.601"></a> +<span class="sourceLineNo">602</span> if (LOG.isTraceEnabled()) {<a name="line.602"></a> +<span class="sourceLineNo">603</span> LOG.trace("freed " + StringUtils.byteDesc(bytesFreed) +<a name="line.603"></a> +<span class="sourceLineNo">604</span> " from single and multi buckets");<a name="line.604"></a> +<span class="sourceLineNo">605</span> }<a name="line.605"></a> +<span class="sourceLineNo">606</span> bytesFreed += bucketMemory.free(bytesToFree - bytesFreed);<a name="line.606"></a> +<span class="sourceLineNo">607</span> if (LOG.isTraceEnabled()) {<a name="line.607"></a> +<span class="sourceLineNo">608</span> LOG.trace("freed " + StringUtils.byteDesc(bytesFreed) +<a name="line.608"></a> +<span class="sourceLineNo">609</span> " total from all three buckets ");<a name="line.609"></a> +<span class="sourceLineNo">610</span> }<a name="line.610"></a> +<span class="sourceLineNo">611</span> } else {<a name="line.611"></a> +<span class="sourceLineNo">612</span> // this means no need to evict block in memory bucket,<a name="line.612"></a> +<span class="sourceLineNo">613</span> // and we try best to make the ratio between single-bucket and<a name="line.613"></a> +<span class="sourceLineNo">614</span> // multi-bucket is 1:2<a name="line.614"></a> +<span class="sourceLineNo">615</span> long bytesRemain = s + m - bytesToFree;<a name="line.615"></a> +<span class="sourceLineNo">616</span> if (3 * s <= bytesRemain) {<a name="line.616"></a> +<span class="sourceLineNo">617</span> // single-bucket is small enough that no eviction happens for it<a name="line.617"></a> +<span class="sourceLineNo">618</span> // hence all eviction goes from multi-bucket<a name="line.618"></a> +<span class="sourceLineNo">619</span> bytesFreed = bucketMulti.free(bytesToFree);<a name="line.619"></a> +<span class="sourceLineNo">620</span> } else if (3 * m <= 2 * bytesRemain) {<a name="line.620"></a> +<span class="sourceLineNo">621</span> // multi-bucket is small enough that no eviction happens for it<a name="line.621"></a> +<span class="sourceLineNo">622</span> // hence all eviction goes from single-bucket<a name="line.622"></a> +<span class="sourceLineNo">623</span> bytesFreed = bucketSingle.free(bytesToFree);<a name="line.623"></a> +<span class="sourceLineNo">624</span> } else {<a name="line.624"></a> +<span class="sourceLineNo">625</span> // both buckets need to evict some blocks<a name="line.625"></a> +<span class="sourceLineNo">626</span> bytesFreed = bucketSingle.free(s - bytesRemain / 3);<a name="line.626"></a> +<span class="sourceLineNo">627</span> if (bytesFreed < bytesToFree) {<a name="line.627"></a> +<span class="sourceLineNo">628</span> bytesFreed += bucketMulti.free(bytesToFree - bytesFreed);<a name="line.628"></a> +<span class="sourceLineNo">629</span> }<a name="line.629"></a> +<span class="sourceLineNo">630</span> }<a name="line.630"></a> +<span class="sourceLineNo">631</span> }<a name="line.631"></a> +<span class="sourceLineNo">632</span> } else {<a name="line.632"></a> +<span class="sourceLineNo">633</span> PriorityQueue<BlockBucket> bucketQueue =<a name="line.633"></a> +<span class="sourceLineNo">634</span> new PriorityQueue<BlockBucket>(3);<a name="line.634"></a> +<span class="sourceLineNo">635</span><a name="line.635"></a> +<span class="sourceLineNo">636</span> bucketQueue.add(bucketSingle);<a name="line.636"></a> +<span class="sourceLineNo">637</span> bucketQueue.add(bucketMulti);<a name="line.637"></a> +<span class="sourceLineNo">638</span> bucketQueue.add(bucketMemory);<a name="line.638"></a> <span class="sourceLineNo">639</span><a name="line.639"></a> -<span class="sourceLineNo">640</span> BlockBucket bucket;<a name="line.640"></a> -<span class="sourceLineNo">641</span> while((bucket = bucketQueue.poll()) != null) {<a name="line.641"></a> -<span class="sourceLineNo">642</span> long overflow = bucket.overflow();<a name="line.642"></a> -<span class="sourceLineNo">643</span> if(overflow > 0) {<a name="line.643"></a> -<span class="sourceLineNo">644</span> long bucketBytesToFree = Math.min(overflow,<a name="line.644"></a> -<span class="sourceLineNo">645</span> (bytesToFree - bytesFreed) / remainingBuckets);<a name="line.645"></a> -<span class="sourceLineNo">646</span> bytesFreed += bucket.free(bucketBytesToFree);<a name="line.646"></a> -<span class="sourceLineNo">647</span> }<a name="line.647"></a> -<span class="sourceLineNo">648</span> remainingBuckets--;<a name="line.648"></a> -<span class="sourceLineNo">649</span> }<a name="line.649"></a> -<span class="sourceLineNo">650</span> }<a name="line.650"></a> -<span class="sourceLineNo">651</span><a name="line.651"></a> -<span class="sourceLineNo">652</span> if (LOG.isTraceEnabled()) {<a name="line.652"></a> -<span class="sourceLineNo">653</span> long single = bucketSingle.totalSize();<a name="line.653"></a> -<span class="sourceLineNo">654</span> long multi = bucketMulti.totalSize();<a name="line.654"></a> -<span class="sourceLineNo">655</span> long memory = bucketMemory.totalSize();<a name="line.655"></a> -<span class="sourceLineNo">656</span> LOG.trace("Block cache LRU eviction completed; " +<a name="line.656"></a> -<span class="sourceLineNo">657</span> "freed=" + StringUtils.byteDesc(bytesFreed) + ", " +<a name="line.657"></a> -<span class="sourceLineNo">658</span> "total=" + StringUtils.byteDesc(this.size.get()) + ", " +<a name="line.658"></a> -<span class="sourceLineNo">659</span> "single=" + StringUtils.byteDesc(single) + ", " +<a name="line.659"></a> -<span class="sourceLineNo">660</span> "multi=" + StringUtils.byteDesc(multi) + ", " +<a name="line.660"></a> -<span class="sourceLineNo">661</span> "memory=" + StringUtils.byteDesc(memory));<a name="line.661"></a> -<span class="sourceLineNo">662</span> }<a name="line.662"></a> -<span class="sourceLineNo">663</span> } finally {<a name="line.663"></a> -<span class="sourceLineNo">664</span> stats.evict();<a name="line.664"></a> -<span class="sourceLineNo">665</span> evictionInProgress = false;<a name="line.665"></a> -<span class="sourceLineNo">666</span> evictionLock.unlock();<a name="line.666"></a> -<span class="sourceLineNo">667</span> }<a name="line.667"></a> -<span class="sourceLineNo">668</span> }<a name="line.668"></a> -<span class="sourceLineNo">669</span><a name="line.669"></a> -<span class="sourceLineNo">670</span> @Override<a name="line.670"></a> -<span class="sourceLineNo">671</span> public String toString() {<a name="line.671"></a> -<span class="sourceLineNo">672</span> return Objects.toStringHelper(this)<a name="line.672"></a> -<span class="sourceLineNo">673</span> .add("blockCount", getBlockCount())<a name="line.673"></a> -<span class="sourceLineNo">674</span> .add("currentSize", getCurrentSize())<a name="line.674"></a> -<span class="sourceLineNo">675</span> .add("freeSize", getFreeSize())<a name="line.675"></a> -<span class="sourceLineNo">676</span> .add("maxSize", getMaxSize())<a name="line.676"></a> -<span class="sourceLineNo">677</span> .add("heapSize", heapSize())<a name="line.677"></a> -<span class="sourceLineNo">678</span> .add("minSize", minSize())<a name="line.678"></a> -<span class="sourceLineNo">679</span> .add("minFactor", minFactor)<a name="line.679"></a> -<span class="sourceLineNo">680</span> .add("multiSize", multiSize())<a name="line.680"></a> -<span class="sourceLineNo">681</span> .add("multiFactor", multiFactor)<a name="line.681"></a> -<span class="sourceLineNo">682</span> .add("singleSize", singleSize())<a name="line.682"></a> -<span class="sourceLineNo">683</span> .add("singleFactor", singleFactor)<a name="line.683"></a> -<span class="sourceLineNo">684</span> .toString();<a name="line.684"></a> -<span class="sourceLineNo">685</span> }<a name="line.685"></a> -<span class="sourceLineNo">686</span><a name="line.686"></a> -<span class="sourceLineNo">687</span> /**<a name="line.687"></a> -<span class="sourceLineNo">688</span> * Used to group blocks into priority buckets. 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