[
https://issues.apache.org/jira/browse/HBASE-15392?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
stack updated HBASE-15392:
--------------------------
Attachment: reads.png
gc.png
io.png
Small YCSB test comparing before and after patch. Its the pure random read
test. Interesting is that while patch read rate is up when patch is applied, it
os not that much different when cache is LRU L1 (no L2 in this case). You can
see though that we are doing less i/o. Thats good.
> 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
> Attachments: 15392-0.98-looksee.txt, 15392.wip.patch,
> 15392v2.wip.patch, 15392v3.wip.patch, 15392v4.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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