You are viewing a plain text version of this content. The canonical link for it is here.
Posted to commits@hbase.apache.org by gi...@apache.org on 2018/05/15 14:50:12 UTC
[29/50] hbase-site git commit: Published site at
26babcf013de696b899d76a3c39434b794440d8d.
http://git-wip-us.apache.org/repos/asf/hbase-site/blob/da4482ac/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/LruBlockCache.EvictionThread.html
----------------------------------------------------------------------
diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/LruBlockCache.EvictionThread.html b/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/LruBlockCache.EvictionThread.html
index f5747c6..b94ef5e 100644
--- a/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/LruBlockCache.EvictionThread.html
+++ b/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/LruBlockCache.EvictionThread.html
@@ -388,811 +388,816 @@
<span class="sourceLineNo">380</span><a name="line.380"></a>
<span class="sourceLineNo">381</span> LruCachedBlock cb = map.get(cacheKey);<a name="line.381"></a>
<span class="sourceLineNo">382</span> if (cb != null) {<a name="line.382"></a>
-<span class="sourceLineNo">383</span> // compare the contents, if they are not equal, we are in big trouble<a name="line.383"></a>
-<span class="sourceLineNo">384</span> if (BlockCacheUtil.compareCacheBlock(buf, cb.getBuffer()) != 0) {<a name="line.384"></a>
-<span class="sourceLineNo">385</span> throw new RuntimeException("Cached block contents differ, which should not have happened."<a name="line.385"></a>
-<span class="sourceLineNo">386</span> + "cacheKey:" + cacheKey);<a name="line.386"></a>
-<span class="sourceLineNo">387</span> }<a name="line.387"></a>
-<span class="sourceLineNo">388</span> String msg = "Cached an already cached block: " + cacheKey + " cb:" + cb.getCacheKey();<a name="line.388"></a>
-<span class="sourceLineNo">389</span> msg += ". This is harmless and can happen in rare cases (see HBASE-8547)";<a name="line.389"></a>
-<span class="sourceLineNo">390</span> LOG.warn(msg);<a name="line.390"></a>
-<span class="sourceLineNo">391</span> return;<a name="line.391"></a>
-<span class="sourceLineNo">392</span> }<a name="line.392"></a>
-<span class="sourceLineNo">393</span> long currentSize = size.get();<a name="line.393"></a>
-<span class="sourceLineNo">394</span> long currentAcceptableSize = acceptableSize();<a name="line.394"></a>
-<span class="sourceLineNo">395</span> long hardLimitSize = (long) (hardCapacityLimitFactor * currentAcceptableSize);<a name="line.395"></a>
-<span class="sourceLineNo">396</span> if (currentSize >= hardLimitSize) {<a name="line.396"></a>
-<span class="sourceLineNo">397</span> stats.failInsert();<a name="line.397"></a>
-<span class="sourceLineNo">398</span> if (LOG.isTraceEnabled()) {<a name="line.398"></a>
-<span class="sourceLineNo">399</span> LOG.trace("LruBlockCache current size " + StringUtils.byteDesc(currentSize)<a name="line.399"></a>
-<span class="sourceLineNo">400</span> + " has exceeded acceptable size " + StringUtils.byteDesc(currentAcceptableSize) + "."<a name="line.400"></a>
-<span class="sourceLineNo">401</span> + " The hard limit size is " + StringUtils.byteDesc(hardLimitSize)<a name="line.401"></a>
-<span class="sourceLineNo">402</span> + ", failed to put cacheKey:" + cacheKey + " into LruBlockCache.");<a name="line.402"></a>
-<span class="sourceLineNo">403</span> }<a name="line.403"></a>
-<span class="sourceLineNo">404</span> if (!evictionInProgress) {<a name="line.404"></a>
-<span class="sourceLineNo">405</span> runEviction();<a name="line.405"></a>
-<span class="sourceLineNo">406</span> }<a name="line.406"></a>
-<span class="sourceLineNo">407</span> return;<a name="line.407"></a>
-<span class="sourceLineNo">408</span> }<a name="line.408"></a>
-<span class="sourceLineNo">409</span> cb = new LruCachedBlock(cacheKey, buf, count.incrementAndGet(), inMemory);<a name="line.409"></a>
-<span class="sourceLineNo">410</span> long newSize = updateSizeMetrics(cb, false);<a name="line.410"></a>
-<span class="sourceLineNo">411</span> map.put(cacheKey, cb);<a name="line.411"></a>
-<span class="sourceLineNo">412</span> long val = elements.incrementAndGet();<a name="line.412"></a>
-<span class="sourceLineNo">413</span> if (buf.getBlockType().isData()) {<a name="line.413"></a>
-<span class="sourceLineNo">414</span> dataBlockElements.increment();<a name="line.414"></a>
-<span class="sourceLineNo">415</span> }<a name="line.415"></a>
-<span class="sourceLineNo">416</span> if (LOG.isTraceEnabled()) {<a name="line.416"></a>
-<span class="sourceLineNo">417</span> long size = map.size();<a name="line.417"></a>
-<span class="sourceLineNo">418</span> assertCounterSanity(size, val);<a name="line.418"></a>
-<span class="sourceLineNo">419</span> }<a name="line.419"></a>
-<span class="sourceLineNo">420</span> if (newSize > currentAcceptableSize && !evictionInProgress) {<a name="line.420"></a>
-<span class="sourceLineNo">421</span> runEviction();<a name="line.421"></a>
-<span class="sourceLineNo">422</span> }<a name="line.422"></a>
-<span class="sourceLineNo">423</span> }<a name="line.423"></a>
-<span class="sourceLineNo">424</span><a name="line.424"></a>
-<span class="sourceLineNo">425</span> /**<a name="line.425"></a>
-<span class="sourceLineNo">426</span> * Sanity-checking for parity between actual block cache content and metrics.<a name="line.426"></a>
-<span class="sourceLineNo">427</span> * Intended only for use with TRACE level logging and -ea JVM.<a name="line.427"></a>
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-<span class="sourceLineNo">431</span> LOG.trace("counterVal overflow. Assertions unreliable. counterVal=" + counterVal +<a name="line.431"></a>
-<span class="sourceLineNo">432</span> ", mapSize=" + mapSize);<a name="line.432"></a>
-<span class="sourceLineNo">433</span> return;<a name="line.433"></a>
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-<span class="sourceLineNo">435</span> if (mapSize < Integer.MAX_VALUE) {<a name="line.435"></a>
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-<span class="sourceLineNo">437</span> if (pct_diff > 0.05) {<a name="line.437"></a>
-<span class="sourceLineNo">438</span> LOG.trace("delta between reported and actual size > 5%. counterVal=" + counterVal +<a name="line.438"></a>
-<span class="sourceLineNo">439</span> ", mapSize=" + mapSize);<a name="line.439"></a>
-<span class="sourceLineNo">440</span> }<a name="line.440"></a>
-<span class="sourceLineNo">441</span> }<a name="line.441"></a>
-<span class="sourceLineNo">442</span> }<a name="line.442"></a>
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-<span class="sourceLineNo">462</span> long heapsize = cb.heapSize();<a name="line.462"></a>
-<span class="sourceLineNo">463</span> BlockType bt = cb.getBuffer().getBlockType();<a name="line.463"></a>
-<span class="sourceLineNo">464</span> if (evict) {<a name="line.464"></a>
-<span class="sourceLineNo">465</span> heapsize *= -1;<a name="line.465"></a>
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-<span class="sourceLineNo">467</span> if (bt != null && bt.isData()) {<a name="line.467"></a>
-<span class="sourceLineNo">468</span> dataBlockSize.add(heapsize);<a name="line.468"></a>
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-<span class="sourceLineNo">470</span> return size.addAndGet(heapsize);<a name="line.470"></a>
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-<span class="sourceLineNo">472</span><a name="line.472"></a>
-<span class="sourceLineNo">473</span> /**<a name="line.473"></a>
-<span class="sourceLineNo">474</span> * Get the buffer of the block with the specified name.<a name="line.474"></a>
-<span class="sourceLineNo">475</span> *<a name="line.475"></a>
-<span class="sourceLineNo">476</span> * @param cacheKey block's cache key<a name="line.476"></a>
-<span class="sourceLineNo">477</span> * @param caching true if the caller caches blocks on cache misses<a name="line.477"></a>
-<span class="sourceLineNo">478</span> * @param repeat Whether this is a repeat lookup for the same block<a name="line.478"></a>
-<span class="sourceLineNo">479</span> * (used to avoid double counting cache misses when doing double-check<a name="line.479"></a>
-<span class="sourceLineNo">480</span> * locking)<a name="line.480"></a>
-<span class="sourceLineNo">481</span> * @param updateCacheMetrics Whether to update cache metrics or not<a name="line.481"></a>
-<span class="sourceLineNo">482</span> *<a name="line.482"></a>
-<span class="sourceLineNo">483</span> * @return buffer of specified cache key, or null if not in cache<a name="line.483"></a>
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-<span class="sourceLineNo">486</span> public Cacheable getBlock(BlockCacheKey cacheKey, boolean caching, boolean repeat,<a name="line.486"></a>
-<span class="sourceLineNo">487</span> boolean updateCacheMetrics) {<a name="line.487"></a>
-<span class="sourceLineNo">488</span> LruCachedBlock cb = map.get(cacheKey);<a name="line.488"></a>
-<span class="sourceLineNo">489</span> if (cb == null) {<a name="line.489"></a>
-<span class="sourceLineNo">490</span> if (!repeat && updateCacheMetrics) {<a name="line.490"></a>
-<span class="sourceLineNo">491</span> stats.miss(caching, cacheKey.isPrimary(), cacheKey.getBlockType());<a name="line.491"></a>
-<span class="sourceLineNo">492</span> }<a name="line.492"></a>
-<span class="sourceLineNo">493</span> // If there is another block cache then try and read there.<a name="line.493"></a>
-<span class="sourceLineNo">494</span> // However if this is a retry ( second time in double checked locking )<a name="line.494"></a>
-<span class="sourceLineNo">495</span> // And it's already a miss then the l2 will also be a miss.<a name="line.495"></a>
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-<span class="sourceLineNo">498</span><a name="line.498"></a>
-<span class="sourceLineNo">499</span> // Promote this to L1.<a name="line.499"></a>
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-<span class="sourceLineNo">501</span> if (result instanceof HFileBlock && ((HFileBlock) result).usesSharedMemory()) {<a name="line.501"></a>
-<span class="sourceLineNo">502</span> result = ((HFileBlock) result).deepClone();<a name="line.502"></a>
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-<span class="sourceLineNo">511</span> cb.access(count.incrementAndGet());<a name="line.511"></a>
-<span class="sourceLineNo">512</span> return cb.getBuffer();<a name="line.512"></a>
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-<span class="sourceLineNo">517</span> *<a name="line.517"></a>
-<span class="sourceLineNo">518</span> * @return true if contains the block<a name="line.518"></a>
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+<span class="sourceLineNo">388</span> } else {<a name="line.388"></a>
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+<span class="sourceLineNo">391</span> } else {<a name="line.391"></a>
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