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Posted to dev@hbase.apache.org by "stack (JIRA)" <ji...@apache.org> on 2016/04/22 07:42:13 UTC
[jira] [Reopened] (HBASE-15392) Single Cell Get reads two
HFileBlocks
[ https://issues.apache.org/jira/browse/HBASE-15392?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
stack reopened HBASE-15392:
---------------------------
Reopen to get a run of the backport
> Single Cell Get reads two HFileBlocks
> -------------------------------------
>
> Key: HBASE-15392
> URL: https://issues.apache.org/jira/browse/HBASE-15392
> Project: HBase
> Issue Type: Sub-task
> Components: BucketCache
> Reporter: stack
> Assignee: stack
> Fix For: 2.0.0
>
> Attachments: 15392-0.98-looksee.txt, 15392.backport.branch-1.patch, 15392.wip.patch, 15392v2.wip.patch, 15392v3.wip.patch, 15392v4.patch, 15392v5.patch, 15392v6.patch, 15392v7 (1).patch, 15392v7.patch, 15392v7.patch, 15392v7.patch, 15392v7.patch, 15392v7.patch, 15392v9.patch, HBASE-15265-v8.patch, HBASE-15392_suggest.patch, gc.png, gc.png, io.png, no_optimize.patch, no_optimize.patch, reads.png, reads.png, two_seeks.txt
>
>
> As found by Daniel "SystemTap" Pol, a simple Get results in our reading two HFileBlocks, the one that contains the wanted Cell, and the block that follows.
> Here is a bit of custom logging that logs a stack trace on each HFileBlock read so you can see the call stack responsible:
> {code}
> 2016-03-03 22:20:30,191 INFO [B.defaultRpcServer.handler=20,queue=2,port=16020] regionserver.StoreScanner: START LOOP
> 2016-03-03 22:20:30,192 INFO [B.defaultRpcServer.handler=20,queue=2,port=16020] regionserver.StoreScanner: QCODE SEEK_NEXT_COL
> 2016-03-03 22:20:30,192 INFO [B.defaultRpcServer.handler=20,queue=2,port=16020] hfile.HFileBlockIndex: STARTED WHILE
> 2016-03-03 22:20:30,192 INFO [B.defaultRpcServer.handler=20,queue=2,port=16020] hfile.CombinedBlockCache: OUT OF L2
> 2016-03-03 22:20:30,192 TRACE [B.defaultRpcServer.handler=20,queue=2,port=16020] bucket.BucketCache: Read offset=31409152, len=2103
> 2016-03-03 22:20:30,192 TRACE [B.defaultRpcServer.handler=20,queue=2,port=16020] bucket.FileIOEngine: offset=31409152, length=2103
> 2016-03-03 22:20:30,193 TRACE [B.defaultRpcServer.handler=20,queue=2,port=16020] hfile.HFileReaderImpl: From Cache [blockType=DATA, fileOffset=2055421, headerSize=33, onDiskSizeWithoutHeader=2024, uncompressedSizeWithoutHeader=2020, prevBlockOffset=2053364, isUseHBaseChecksum=true, checksumType=CRC32C, bytesPerChecksum=16384, onDiskDataSizeWithHeader=2053, getOnDiskSizeWithHeader=2057, totalChecksumBytes=4, isUnpacked=true, buf=[org.apache.hadoop.hbase.nio.SingleByteBuff@e19fbd54], dataBeginsWith=\x00\x00\x00)\x00\x00\x01`\x00\x16user995139035672819231, fileContext=[usesHBaseChecksum=true, checksumType=CRC32C, bytesPerChecksum=16384, blocksize=65536, encoding=NONE, includesMvcc=true, includesTags=false, compressAlgo=NONE, compressTags=false, cryptoContext=[cipher=NONE keyHash=NONE]]]
> 2016-03-03 22:20:30,193 TRACE [B.defaultRpcServer.handler=20,queue=2,port=16020] hfile.HFileReaderImpl: Cache hit return [blockType=DATA, fileOffset=2055421, headerSize=33, onDiskSizeWithoutHeader=2024, uncompressedSizeWithoutHeader=2020, prevBlockOffset=2053364, isUseHBaseChecksum=true, checksumType=CRC32C, bytesPerChecksum=16384, onDiskDataSizeWithHeader=2053, getOnDiskSizeWithHeader=2057, totalChecksumBytes=4, isUnpacked=true, buf=[org.apache.hadoop.hbase.nio.SingleByteBuff@e19fbd54], dataBeginsWith=\x00\x00\x00)\x00\x00\x01`\x00\x16user995139035672819231, fileContext=[usesHBaseChecksum=true, checksumType=CRC32C, bytesPerChecksum=16384, blocksize=65536, encoding=NONE, includesMvcc=true, includesTags=false, compressAlgo=NONE, compressTags=false, cryptoContext=[cipher=NONE keyHash=NONE]]]
> java.lang.Throwable
> at org.apache.hadoop.hbase.io.hfile.HFileReaderImpl.readBlock(HFileReaderImpl.java:1515)
> at org.apache.hadoop.hbase.io.hfile.HFileBlockIndex$CellBasedKeyBlockIndexReader.loadDataBlockWithScanInfo(HFileBlockIndex.java:324)
> at org.apache.hadoop.hbase.io.hfile.HFileReaderImpl$HFileScannerImpl.seekTo(HFileReaderImpl.java:831)
> at org.apache.hadoop.hbase.io.hfile.HFileReaderImpl$HFileScannerImpl.reseekTo(HFileReaderImpl.java:812)
> at org.apache.hadoop.hbase.regionserver.StoreFileScanner.reseekAtOrAfter(StoreFileScanner.java:288)
> at org.apache.hadoop.hbase.regionserver.StoreFileScanner.reseek(StoreFileScanner.java:198)
> at org.apache.hadoop.hbase.regionserver.NonLazyKeyValueScanner.doRealSeek(NonLazyKeyValueScanner.java:54)
> at org.apache.hadoop.hbase.regionserver.KeyValueHeap.generalizedSeek(KeyValueHeap.java:321)
> at org.apache.hadoop.hbase.regionserver.KeyValueHeap.requestSeek(KeyValueHeap.java:279)
> at org.apache.hadoop.hbase.regionserver.StoreScanner.reseek(StoreScanner.java:806)
> at org.apache.hadoop.hbase.regionserver.StoreScanner.seekAsDirection(StoreScanner.java:795)
> at org.apache.hadoop.hbase.regionserver.StoreScanner.next(StoreScanner.java:624)
> at org.apache.hadoop.hbase.regionserver.KeyValueHeap.next(KeyValueHeap.java:153)
> at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.populateResult(HRegion.java:5703)
> at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.nextInternal(HRegion.java:5849)
> at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.nextRaw(HRegion.java:5622)
> at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.next(HRegion.java:5598)
> at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.next(HRegion.java:5584)
> at org.apache.hadoop.hbase.regionserver.RSRpcServices.get(RSRpcServices.java:2187)
> at org.apache.hadoop.hbase.regionserver.RSRpcServices.get(RSRpcServices.java:2123)
> at org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:33512)
> at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2229)
> at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:109)
> at org.apache.hadoop.hbase.ipc.RpcExecutor.consumerLoop(RpcExecutor.java:136)
> at org.apache.hadoop.hbase.ipc.RpcExecutor$1.run(RpcExecutor.java:111)
> at java.lang.Thread.run(Thread.java:745)
> 2016-03-03 22:20:30,193 INFO [B.defaultRpcServer.handler=20,queue=2,port=16020] hfile.HFileBlockIndex: READ [blockType=DATA, fileOffset=2055421, headerSize=33, onDiskSizeWithoutHeader=2024, uncompressedSizeWithoutHeader=2020, prevBlockOffset=2053364, isUseHBaseChecksum=true, checksumType=CRC32C, bytesPerChecksum=16384, onDiskDataSizeWithHeader=2053, getOnDiskSizeWithHeader=2057, totalChecksumBytes=4, isUnpacked=true, buf=[org.apache.hadoop.hbase.nio.SingleByteBuff@e19fbd54], dataBeginsWith=\x00\x00\x00)\x00\x00\x01`\x00\x16user995139035672819231, fileContext=[usesHBaseChecksum=true, checksumType=CRC32C, bytesPerChecksum=16384, blocksize=65536, encoding=NONE, includesMvcc=true, includesTags=false, compressAlgo=NONE, compressTags=false, cryptoContext=[cipher=NONE keyHash=NONE]]]
> 2016-03-03 22:20:30,193 INFO [B.defaultRpcServer.handler=20,queue=2,port=16020] hfile.HFileBlockIndex: DATA BLOCK IS TRUE BREAK
> 2016-03-03 22:20:30,193 INFO [B.defaultRpcServer.handler=20,queue=2,port=16020] hfile.HFileBlockIndex: RETURNING
> 2016-03-03 22:20:30,194 INFO [B.defaultRpcServer.handler=20,queue=2,port=16020] regionserver.StoreScanner: QCODE INCLUDE
> 2016-03-03 22:20:30,194 INFO [B.defaultRpcServer.handler=20,queue=2,port=16020] regionserver.StoreScanner: QCODE SKIP
> 2016-03-03 22:20:30,194 INFO [B.defaultRpcServer.handler=20,queue=2,port=16020] hfile.CombinedBlockCache: OUT OF L2
> 2016-03-03 22:20:30,194 TRACE [B.defaultRpcServer.handler=20,queue=2,port=16020] bucket.BucketCache: Read offset=30932992, len=2103
> 2016-03-03 22:20:30,194 TRACE [B.defaultRpcServer.handler=20,queue=2,port=16020] bucket.FileIOEngine: offset=30932992, length=2103
> 2016-03-03 22:20:30,194 TRACE [B.defaultRpcServer.handler=20,queue=2,port=16020] hfile.HFileReaderImpl: From Cache [blockType=DATA, fileOffset=2057478, headerSize=33, onDiskSizeWithoutHeader=2024, uncompressedSizeWithoutHeader=2020, prevBlockOffset=2055421, isUseHBaseChecksum=true, checksumType=CRC32C, bytesPerChecksum=16384, onDiskDataSizeWithHeader=2053, getOnDiskSizeWithHeader=2057, totalChecksumBytes=4, isUnpacked=true, buf=[org.apache.hadoop.hbase.nio.SingleByteBuff@6063ac95], dataBeginsWith=\x00\x00\x00)\x00\x00\x01`\x00\x16user995698996184959679, fileContext=[usesHBaseChecksum=true, checksumType=CRC32C, bytesPerChecksum=16384, blocksize=65536, encoding=NONE, includesMvcc=true, includesTags=false, compressAlgo=NONE, compressTags=false, cryptoContext=[cipher=NONE keyHash=NONE]]]
> 2016-03-03 22:20:30,194 TRACE [B.defaultRpcServer.handler=20,queue=2,port=16020] hfile.HFileReaderImpl: Cache hit return [blockType=DATA, fileOffset=2057478, headerSize=33, onDiskSizeWithoutHeader=2024, uncompressedSizeWithoutHeader=2020, prevBlockOffset=2055421, isUseHBaseChecksum=true, checksumType=CRC32C, bytesPerChecksum=16384, onDiskDataSizeWithHeader=2053, getOnDiskSizeWithHeader=2057, totalChecksumBytes=4, isUnpacked=true, buf=[org.apache.hadoop.hbase.nio.SingleByteBuff@6063ac95], dataBeginsWith=\x00\x00\x00)\x00\x00\x01`\x00\x16user995698996184959679, fileContext=[usesHBaseChecksum=true, checksumType=CRC32C, bytesPerChecksum=16384, blocksize=65536, encoding=NONE, includesMvcc=true, includesTags=false, compressAlgo=NONE, compressTags=false, cryptoContext=[cipher=NONE keyHash=NONE]]]
> java.lang.Throwable
> at org.apache.hadoop.hbase.io.hfile.HFileReaderImpl.readBlock(HFileReaderImpl.java:1515)
> at org.apache.hadoop.hbase.io.hfile.HFileReaderImpl$HFileScannerImpl.readNextDataBlock(HFileReaderImpl.java:906)
> at org.apache.hadoop.hbase.io.hfile.HFileReaderImpl$HFileScannerImpl.isNextBlock(HFileReaderImpl.java:1106)
> at org.apache.hadoop.hbase.io.hfile.HFileReaderImpl$HFileScannerImpl.positionForNextBlock(HFileReaderImpl.java:1100)
> at org.apache.hadoop.hbase.io.hfile.HFileReaderImpl$HFileScannerImpl._next(HFileReaderImpl.java:1118)
> at org.apache.hadoop.hbase.io.hfile.HFileReaderImpl$HFileScannerImpl.next(HFileReaderImpl.java:1139)
> at org.apache.hadoop.hbase.regionserver.StoreFileScanner.next(StoreFileScanner.java:152)
> at org.apache.hadoop.hbase.regionserver.KeyValueHeap.next(KeyValueHeap.java:114)
> at org.apache.hadoop.hbase.regionserver.StoreScanner.next(StoreScanner.java:628)
> at org.apache.hadoop.hbase.regionserver.KeyValueHeap.next(KeyValueHeap.java:153)
> at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.populateResult(HRegion.java:5703)
> at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.nextInternal(HRegion.java:5849)
> at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.nextRaw(HRegion.java:5622)
> at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.next(HRegion.java:5598)
> at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.next(HRegion.java:5584)
> at org.apache.hadoop.hbase.regionserver.RSRpcServices.get(RSRpcServices.java:2187)
> at org.apache.hadoop.hbase.regionserver.RSRpcServices.get(RSRpcServices.java:2123)
> at org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:33512)
> at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2229)
> at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:109)
> at org.apache.hadoop.hbase.ipc.RpcExecutor.consumerLoop(RpcExecutor.java:136)
> at org.apache.hadoop.hbase.ipc.RpcExecutor$1.run(RpcExecutor.java:111)
> at java.lang.Thread.run(Thread.java:745)
> 2016-03-03 22:20:30,195 INFO [B.defaultRpcServer.handler=20,queue=2,port=16020] regionserver.StoreScanner: QCODE DONE
> {code}
> We are in StoreScanner#next.
> Matcher does SEEK_NEXT_COL.
> We pull in the block that has our Cell in it.
> Matcher does INCLUDE
> Then Matcher does SKIP
> SKIP has us go read the next block.
> Then Matcher does DONE.
> Why ain't I getting to DONE after INCLUDE?
> Any clues?
> This code has been like this a while.
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