http://git-wip-us.apache.org/repos/asf/hbase-site/blob/e5c3dcd1/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/HFileReaderImpl.HFileScannerImpl.ShareableMemoryOffheapKeyValue.html ---------------------------------------------------------------------- diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/HFileReaderImpl.HFileScannerImpl.ShareableMemoryOffheapKeyValue.html b/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/HFileReaderImpl.HFileScannerImpl.ShareableMemoryOffheapKeyValue.html index 5be9775..128a211 100644 --- a/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/HFileReaderImpl.HFileScannerImpl.ShareableMemoryOffheapKeyValue.html +++ b/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/HFileReaderImpl.HFileScannerImpl.ShareableMemoryOffheapKeyValue.html @@ -994,902 +994,908 @@ <span class="sourceLineNo">986</span> return new KeyValue.KeyOnlyKeyValue(keyBuf.array(), keyBuf.arrayOffset()<a name="line.986"></a> <span class="sourceLineNo">987</span> + keyPair.getSecond(), currKeyLen);<a name="line.987"></a> <span class="sourceLineNo">988</span> } else {<a name="line.988"></a> -<span class="sourceLineNo">989</span> return new ByteBufferedKeyOnlyKeyValue(keyBuf, keyPair.getSecond(), currKeyLen);<a name="line.989"></a> -<span class="sourceLineNo">990</span> }<a name="line.990"></a> -<span class="sourceLineNo">991</span> }<a name="line.991"></a> -<span class="sourceLineNo">992</span><a name="line.992"></a> -<span class="sourceLineNo">993</span> private static class ShareableMemoryKeyValue extends SizeCachedKeyValue implements<a name="line.993"></a> -<span class="sourceLineNo">994</span> ShareableMemory {<a name="line.994"></a> -<span class="sourceLineNo">995</span> public ShareableMemoryKeyValue(byte[] bytes, int offset, int length, long seqId) {<a name="line.995"></a> -<span class="sourceLineNo">996</span> super(bytes, offset, length, seqId);<a name="line.996"></a> -<span class="sourceLineNo">997</span> }<a name="line.997"></a> +<span class="sourceLineNo">989</span> // Better to do a copy here instead of holding on to this BB so that<a name="line.989"></a> +<span class="sourceLineNo">990</span> // we could release the blocks referring to this key. 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Evictions on file close happen async<a name="line.1360"></a> -<span class="sourceLineNo">1361</span> // so blocks with the old encoding still linger in cache for some<a name="line.1361"></a> -<span class="sourceLineNo">1362</span> // period of time. This event should be rare as it only happens on<a name="line.1362"></a> -<span class="sourceLineNo">1363</span> // schema definition change.<a name="line.1363"></a> -<span class="sourceLineNo">1364</span> LOG.info("Evicting cached block with key " + cacheKey +<a name="line.1364"></a> -<span class="sourceLineNo">1365</span> " because of a data block encoding mismatch" +<a name="line.1365"></a> -<span class="sourceLineNo">1366</span> "; expected: " + expectedDataBlockEncoding +<a name="line.1366"></a> -<span class="sourceLineNo">1367</span> ", actual: " + actualDataBlockEncoding);<a name="line.1367"></a> -<span class="sourceLineNo">1368</span> // This is an error scenario. so here we need to decrement the<a name="line.1368"></a> -<span class="sourceLineNo">1369</span> // count.<a name="line.1369"></a> -<span class="sourceLineNo">1370</span> cache.returnBlock(cacheKey, cachedBlock);<a name="line.1370"></a> -<span class="sourceLineNo">1371</span> cache.evictBlock(cacheKey);<a name="line.1371"></a> -<span class="sourceLineNo">1372</span> }<a name="line.1372"></a> -<span class="sourceLineNo">1373</span> return null;<a name="line.1373"></a> -<span class="sourceLineNo">1374</span> }<a name="line.1374"></a> -<span class="sourceLineNo">1375</span> return cachedBlock;<a name="line.1375"></a> -<span class="sourceLineNo">1376</span> }<a name="line.1376"></a> -<span class="sourceLineNo">1377</span> }<a name="line.1377"></a> -<span class="sourceLineNo">1378</span> return null;<a name="line.1378"></a> -<span class="sourceLineNo">1379</span> }<a name="line.1379"></a> -<span class="sourceLineNo">1380</span><a name="line.1380"></a> -<span class="sourceLineNo">1381</span> /**<a name="line.1381"></a> -<span class="sourceLineNo">1382</span> * @param metaBlockName<a name="line.1382"></a> -<span class="sourceLineNo">1383</span> * @param cacheBlock Add block to cache, if found<a name="line.1383"></a> -<span class="sourceLineNo">1384</span> * @return block wrapped in a ByteBuffer, with header skipped<a name="line.1384"></a> -<span class="sourceLineNo">1385</span> * @throws IOException<a name="line.1385"></a> -<span class="sourceLineNo">1386</span> */<a name="line.1386"></a> -<span class="sourceLineNo">1387</span> @Override<a name="line.1387"></a> -<span class="sourceLineNo">1388</span> public HFileBlock getMetaBlock(String metaBlockName, boolean cacheBlock)<a name="line.1388"></a> -<span class="sourceLineNo">1389</span> throws IOException {<a name="line.1389"></a> -<span class="sourceLineNo">1390</span> if (trailer.getMetaIndexCount() == 0) {<a name="line.1390"></a> -<span class="sourceLineNo">1391</span> return null; // there are no meta blocks<a name="line.1391"></a> -<span class="sourceLineNo">1392</span> }<a name="line.1392"></a> -<span class="sourceLineNo">1393</span> if (metaBlockIndexReader == null) {<a name="line.1393"></a> -<span class="sourceLineNo">1394</span> throw new IOException("Meta index not loaded");<a name="line.1394"></a> -<span class="sourceLineNo">1395</span> }<a name="line.1395"></a> -<span class="sourceLineNo">1396</span><a name="line.1396"></a> -<span class="sourceLineNo">1397</span> byte[] mbname = Bytes.toBytes(metaBlockName);<a name="line.1397"></a> -<span class="sourceLineNo">1398</span> int block = metaBlockIndexReader.rootBlockContainingKey(mbname,<a name="line.1398"></a> -<span class="sourceLineNo">1399</span> 0, mbname.length);<a name="line.1399"></a> -<span class="sourceLineNo">1400</span> if (block == -1)<a name="line.1400"></a> -<span class="sourceLineNo">1401</span> return null;<a name="line.1401"></a> -<span class="sourceLineNo">1402</span> long blockSize = metaBlockIndexReader.getRootBlockDataSize(block);<a name="line.1402"></a> -<span class="sourceLineNo">1403</span><a name="line.1403"></a> -<span class="sourceLineNo">1404</span> // Per meta key from any given file, synchronize reads for said block. This<a name="line.1404"></a> -<span class="sourceLineNo">1405</span> // is OK to do for meta blocks because the meta block index is always<a name="line.1405"></a> -<span class="sourceLineNo">1406</span> // single-level.<a name="line.1406"></a> -<span class="sourceLineNo">1407</span> synchronized (metaBlockIndexReader<a name="line.1407"></a> -<span class="sourceLineNo">1408</span> .getRootBlockKey(block)) {<a name="line.1408"></a> -<span class="sourceLineNo">1409</span> // Check cache for block. If found return.<a name="line.1409"></a> -<span class="sourceLineNo">1410</span> long metaBlockOffset = metaBlockIndexReader.getRootBlockOffset(block);<a name="line.1410"></a> -<span class="sourceLineNo">1411</span> BlockCacheKey cacheKey = new BlockCacheKey(name, metaBlockOffset,<a name="line.1411"></a> -<span class="sourceLineNo">1412</span> this.isPrimaryReplicaReader());<a name="line.1412"></a> -<span class="sourceLineNo">1413</span><a name="line.1413"></a> -<span class="sourceLineNo">1414</span> cacheBlock &= cacheConf.shouldCacheDataOnRead();<a name="line.1414"></a> -<span class="sourceLineNo">1415</span> if (cacheConf.isBlockCacheEnabled()) {<a name="line.1415"></a> -<span class="sourceLineNo">1416</span> HFileBlock cachedBlock = getCachedBlock(cacheKey, cacheBlock, false, true, true,<a name="line.1416"></a> -<span class="sourceLineNo">1417</span> BlockType.META, null);<a name="line.1417"></a> -<span class="sourceLineNo">1418</span> if (cachedBlock != null) {<a name="line.1418"></a> -<span class="sourceLineNo">1419</span> assert cachedBlock.isUnpacked() : "Packed block leak.";<a name="line.1419"></a> -<span class="sourceLineNo">1420</span> // Return a distinct 'shallow copy' of the block,<a name="line.1420"></a> -<span class="sourceLineNo">1421</span> // so pos does not get messed by the scanner<a name="line.1421"></a> -<span class="sourceLineNo">1422</span> return cachedBlock;<a name="line.1422"></a> -<span class="sourceLineNo">1423</span> }<a name="line.1423"></a> -<span class="sourceLineNo">1424</span> // Cache Miss, please load.<a name="line.1424"></a> -<span class="sourceLineNo">1425</span> }<a name="line.1425"></a> -<span class="sourceLineNo">1426</span><a name="line.1426"></a> -<span class="sourceLineNo">1427</span> HFileBlock metaBlock = fsBlockReader.readBlockData(metaBlockOffset,<a name="line.1427"></a> -<span class="sourceLineNo">1428</span> blockSize, -1, true).unpack(hfileContext, fsBlockReader);<a name="line.1428"></a> -<span class="sourceLineNo">1429</span><a name="line.1429"></a> -<span class="sourceLineNo">1430</span> // Cache the block<a name="line.1430"></a> -<span class="sourceLineNo">1431</span> if (cacheBlock) {<a name="line.1431"></a> -<span class="sourceLineNo">1432</span> cacheConf.getBlockCache().cacheBlock(cacheKey, metaBlock,<a name="line.1432"></a> -<span class="sourceLineNo">1433</span> cacheConf.isInMemory(), this.cacheConf.isCacheDataInL1());<a name="line.1433"></a> -<span class="sourceLineNo">1434</span> }<a name="line.1434"></a> +<span class="sourceLineNo">1301</span> /**<a name="line.1301"></a> +<span class="sourceLineNo">1302</span> * The size of a (key length, value length) tuple that prefixes each entry in<a name="line.1302"></a> +<span class="sourceLineNo">1303</span> * a data block.<a name="line.1303"></a> +<span class="sourceLineNo">1304</span> */<a name="line.1304"></a> +<span class="sourceLineNo">1305</span> public final static int KEY_VALUE_LEN_SIZE = 2 * Bytes.SIZEOF_INT;<a name="line.1305"></a> +<span class="sourceLineNo">1306</span><a name="line.1306"></a> +<span class="sourceLineNo">1307</span> private boolean includesMemstoreTS = false;<a name="line.1307"></a> +<span class="sourceLineNo">1308</span> protected boolean decodeMemstoreTS = false;<a name="line.1308"></a> +<span class="sourceLineNo">1309</span><a name="line.1309"></a> +<span class="sourceLineNo">1310</span><a name="line.1310"></a> +<span class="sourceLineNo">1311</span> public boolean isDecodeMemstoreTS() {<a name="line.1311"></a> +<span class="sourceLineNo">1312</span> return this.decodeMemstoreTS;<a name="line.1312"></a> +<span class="sourceLineNo">1313</span> }<a name="line.1313"></a> +<span class="sourceLineNo">1314</span><a name="line.1314"></a> +<span class="sourceLineNo">1315</span> public boolean shouldIncludeMemstoreTS() {<a name="line.1315"></a> +<span class="sourceLineNo">1316</span> return includesMemstoreTS;<a name="line.1316"></a> +<span class="sourceLineNo">1317</span> }<a name="line.1317"></a> +<span class="sourceLineNo">1318</span><a name="line.1318"></a> +<span class="sourceLineNo">1319</span> /**<a name="line.1319"></a> +<span class="sourceLineNo">1320</span> * Retrieve block from cache. Validates the retrieved block's type vs {@code expectedBlockType}<a name="line.1320"></a> +<span class="sourceLineNo">1321</span> * and its encoding vs. {@code expectedDataBlockEncoding}. Unpacks the block as necessary.<a name="line.1321"></a> +<span class="sourceLineNo">1322</span> */<a name="line.1322"></a> +<span class="sourceLineNo">1323</span> private HFileBlock getCachedBlock(BlockCacheKey cacheKey, boolean cacheBlock, boolean useLock,<a name="line.1323"></a> +<span class="sourceLineNo">1324</span> boolean isCompaction, boolean updateCacheMetrics, BlockType expectedBlockType,<a name="line.1324"></a> +<span class="sourceLineNo">1325</span> DataBlockEncoding expectedDataBlockEncoding) throws IOException {<a name="line.1325"></a> +<span class="sourceLineNo">1326</span> // Check cache for block. If found return.<a name="line.1326"></a> +<span class="sourceLineNo">1327</span> if (cacheConf.isBlockCacheEnabled()) {<a name="line.1327"></a> +<span class="sourceLineNo">1328</span> BlockCache cache = cacheConf.getBlockCache();<a name="line.1328"></a> +<span class="sourceLineNo">1329</span> HFileBlock cachedBlock = (HFileBlock) cache.getBlock(cacheKey, cacheBlock, useLock,<a name="line.1329"></a> +<span class="sourceLineNo">1330</span> updateCacheMetrics);<a name="line.1330"></a> +<span class="sourceLineNo">1331</span> if (cachedBlock != null) {<a name="line.1331"></a> +<span class="sourceLineNo">1332</span> if (cacheConf.shouldCacheCompressed(cachedBlock.getBlockType().getCategory())) {<a name="line.1332"></a> +<span class="sourceLineNo">1333</span> HFileBlock compressedBlock = cachedBlock;<a name="line.1333"></a> +<span class="sourceLineNo">1334</span> cachedBlock = compressedBlock.unpack(hfileContext, fsBlockReader);<a name="line.1334"></a> +<span class="sourceLineNo">1335</span> // In case of compressed block after unpacking we can return the compressed block<a name="line.1335"></a> +<span class="sourceLineNo">1336</span> if (compressedBlock != cachedBlock) {<a name="line.1336"></a> +<span class="sourceLineNo">1337</span> cache.returnBlock(cacheKey, compressedBlock);<a name="line.1337"></a> +<span class="sourceLineNo">1338</span> }<a name="line.1338"></a> +<span class="sourceLineNo">1339</span> }<a name="line.1339"></a> +<span class="sourceLineNo">1340</span> validateBlockType(cachedBlock, expectedBlockType);<a name="line.1340"></a> +<span class="sourceLineNo">1341</span><a name="line.1341"></a> +<span class="sourceLineNo">1342</span> if (expectedDataBlockEncoding == null) {<a name="line.1342"></a> +<span class="sourceLineNo">1343</span> return cachedBlock;<a name="line.1343"></a> +<span class="sourceLineNo">1344</span> }<a name="line.1344"></a> +<span class="sourceLineNo">1345</span> DataBlockEncoding actualDataBlockEncoding =<a name="line.1345"></a> +<span class="sourceLineNo">1346</span> cachedBlock.getDataBlockEncoding();<a name="line.1346"></a> +<span class="sourceLineNo">1347</span> // Block types other than data blocks always have<a name="line.1347"></a> +<span class="sourceLineNo">1348</span> // DataBlockEncoding.NONE. To avoid false negative cache misses, only<a name="line.1348"></a> +<span class="sourceLineNo">1349</span> // perform this check if cached block is a data block.<a name="line.1349"></a> +<span class="sourceLineNo">1350</span> if (cachedBlock.getBlockType().isData() &&<a name="line.1350"></a> +<span class="sourceLineNo">1351</span> !actualDataBlockEncoding.equals(expectedDataBlockEncoding)) {<a name="line.1351"></a> +<span class="sourceLineNo">1352</span> // This mismatch may happen if a Scanner, which is used for say a<a name="line.1352"></a> +<span class="sourceLineNo">1353</span> // compaction, tries to read an encoded block from the block cache.<a name="line.1353"></a> +<span class="sourceLineNo">1354</span> // The reverse might happen when an EncodedScanner tries to read<a name="line.1354"></a> +<span class="sourceLineNo">1355</span> // un-encoded blocks which were cached earlier.<a name="line.1355"></a> +<span class="sourceLineNo">1356</span> //<a name="line.1356"></a> +<span class="sourceLineNo">1357</span> // Because returning a data block with an implicit BlockType mismatch<a name="line.1357"></a> +<span class="sourceLineNo">1358</span> // will cause the requesting scanner to throw a disk read should be<a name="line.1358"></a> +<span class="sourceLineNo">1359</span> // forced here. This will potentially cause a significant number of<a name="line.1359"></a> +<span class="sourceLineNo">1360</span> // cache misses, so update so we should keep track of this as it might<a name="line.1360"></a> +<span class="sourceLineNo">1361</span> // justify the work on a CompoundScanner.<a name="line.1361"></a> +<span class="sourceLineNo">1362</span> if (!expectedDataBlockEncoding.equals(DataBlockEncoding.NONE) &&<a name="line.1362"></a> +<span class="sourceLineNo">1363</span> !actualDataBlockEncoding.equals(DataBlockEncoding.NONE)) {<a name="line.1363"></a> +<span class="sourceLineNo">1364</span> // If the block is encoded but the encoding does not match the<a name="line.1364"></a> +<span class="sourceLineNo">1365</span> // expected encoding it is likely the encoding was changed but the<a name="line.1365"></a> +<span class="sourceLineNo">1366</span> // block was not yet evicted. Evictions on file close happen async<a name="line.1366"></a> +<span class="sourceLineNo">1367</span> // so blocks with the old encoding still linger in cache for some<a name="line.1367"></a> +<span class="sourceLineNo">1368</span> // period of time. This event should be rare as it only happens on<a name="line.1368"></a> +<span class="sourceLineNo">1369</span> // schema definition change.<a name="line.1369"></a> +<span class="sourceLineNo">1370</span> LOG.info("Evicting cached block with key " + cacheKey +<a name="line.1370"></a> +<span class="sourceLineNo">1371</span> " because of a data block encoding mismatch" +<a name="line.1371"></a> +<span class="sourceLineNo">1372</span> "; expected: " + expectedDataBlockEncoding +<a name="line.1372"></a> +<span class="sourceLineNo">1373</span> ", actual: " + actualDataBlockEncoding);<a name="line.1373"></a> +<span class="sourceLineNo">1374</span> // This is an error scenario. so here we need to decrement the<a name="line.1374"></a> +<span class="sourceLineNo">1375</span> // count.<a name="line.1375"></a> +<span class="sourceLineNo">1376</span> cache.returnBlock(cacheKey, cachedBlock);<a name="line.1376"></a> +<span class="sourceLineNo">1377</span> cache.evictBlock(cacheKey);<a name="line.1377"></a> +<span class="sourceLineNo">1378</span> }<a name="line.1378"></a> +<span class="sourceLineNo">1379</span> return null;<a name="line.1379"></a> +<span class="sourceLineNo">1380</span> }<a name="line.1380"></a> +<span class="sourceLineNo">1381</span> return cachedBlock;<a name="line.1381"></a> +<span class="sourceLineNo">1382</span> }<a name="line.1382"></a> +<span class="sourceLineNo">1383</span> }<a name="line.1383"></a> +<span class="sourceLineNo">1384</span> return null;<a name="line.1384"></a> +<span class="sourceLineNo">1385</span> }<a name="line.1385"></a> +<span class="sourceLineNo">1386</span><a name="line.1386"></a> +<span class="sourceLineNo">1387</span> /**<a name="line.1387"></a> +<span class="sourceLineNo">1388</span> * @param metaBlockName<a name="line.1388"></a> +<span class="sourceLineNo">1389</span> * @param cacheBlock Add block to cache, if found<a name="line.1389"></a> +<span class="sourceLineNo">1390</span> * @return block wrapped in a ByteBuffer, with header skipped<a name="line.1390"></a> +<span class="sourceLineNo">1391</span> * @throws IOException<a name="line.1391"></a> +<span class="sourceLineNo">1392</span> */<a name="line.1392"></a> +<span class="sourceLineNo">1393</span> @Override<a name="line.1393"></a> +<span class="sourceLineNo">1394</span> public HFileBlock getMetaBlock(String metaBlockName, boolean cacheBlock)<a name="line.1394"></a> +<span class="sourceLineNo">1395</span> throws IOException {<a name="line.1395"></a> +<span class="sourceLineNo">1396</span> if (trailer.getMetaIndexCount() == 0) {<a name="line.1396"></a> +<span class="sourceLineNo">1397</span> return null; // there are no meta blocks<a name="line.1397"></a> +<span class="sourceLineNo">1398</span> }<a name="line.1398"></a> +<span class="sourceLineNo">1399</span> if (metaBlockIndexReader == null) {<a name="line.1399"></a> +<span class="sourceLineNo">1400</span> throw new IOException("Meta index not loaded");<a name="line.1400"></a> +<span class="sourceLineNo">1401</span> }<a name="line.1401"></a> +<span class="sourceLineNo">1402</span><a name="line.1402"></a> +<span class="sourceLineNo">1403</span> byte[] mbname = Bytes.toBytes(metaBlockName);<a name="line.1403"></a> +<span class="sourceLineNo">1404</span> int block = metaBlockIndexReader.rootBlockContainingKey(mbname,<a name="line.1404"></a> +<span class="sourceLineNo">1405</span> 0, mbname.length);<a name="line.1405"></a> +<span class="sourceLineNo">1406</span> if (block == -1)<a name="line.1406"></a> +<span class="sourceLineNo">1407</span> return null;<a name="line.1407"></a> +<span class="sourceLineNo">1408</span> long blockSize = metaBlockIndexReader.getRootBlockDataSize(block);<a name="line.1408"></a> +<span class="sourceLineNo">1409</span><a name="line.1409"></a> +<span class="sourceLineNo">1410</span> // Per meta key from any given file, synchronize reads for said block. This<a name="line.1410"></a> +<span class="sourceLineNo">1411</span> // is OK to do for meta blocks because the meta block index is always<a name="line.1411"></a> +<span class="sourceLineNo">1412</span> // single-level.<a name="line.1412"></a> +<span class="sourceLineNo">1413</span> synchronized (metaBlockIndexReader<a name="line.1413"></a> +<span class="sourceLineNo">1414</span> .getRootBlockKey(block)) {<a name="line.1414"></a> +<span class="sourceLineNo">1415</span> // Check cache for block. If found return.<a name="line.1415"></a> +<span class="sourceLineNo">1416</span> long metaBlockOffset = metaBlockIndexReader.getRootBlockOffset(block);<a name="line.1416"></a> +<span class="sourceLineNo">1417</span> BlockCacheKey cacheKey = new BlockCacheKey(name, metaBlockOffset,<a name="line.1417"></a> +<span class="sourceLineNo">1418</span> this.isPrimaryReplicaReader());<a name="line.1418"></a> +<span class="sourceLineNo">1419</span><a name="line.1419"></a> +<span class="sourceLineNo">1420</span> cacheBlock &= cacheConf.shouldCacheDataOnRead();<a name="line.1420"></a> +<span class="sourceLineNo">1421</span> if (cacheConf.isBlockCacheEnabled()) {<a name="line.1421"></a> +<span class="sourceLineNo">1422</span> HFileBlock cachedBlock = getCachedBlock(cacheKey, cacheBlock, false, true, true,<a name="line.1422"></a> +<span class="sourceLineNo">1423</span> BlockType.META, null);<a name="line.1423"></a> +<span class="sourceLineNo">1424</span> if (cachedBlock != null) {<a name="line.1424"></a> +<span class="sourceLineNo">1425</span> assert cachedBlock.isUnpacked() : "Packed block leak.";<a name="line.1425"></a> +<span class="sourceLineNo">1426</span> // Return a distinct 'shallow copy' of the block,<a name="line.1426"></a> +<span class="sourceLineNo">1427</span> // so pos does not get messed by the scanner<a name="line.1427"></a> +<span class="sourceLineNo">1428</span> return cachedBlock;<a name="line.1428"></a> +<span class="sourceLineNo">1429</span> }<a name="line.1429"></a> +<span class="sourceLineNo">1430</span> // Cache Miss, please load.<a name="line.1430"></a> +<span class="sourceLineNo">1431</span> }<a name="line.1431"></a> +<span class="sourceLineNo">1432</span><a name="line.1432"></a> +<span class="sourceLineNo">1433</span> HFileBlock metaBlock = fsBlockReader.readB
<TRUNCATED>
