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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15392) Single Cell Get reads two HFileBlocks
Date Fri, 11 Mar 2016 13:05:11 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15392?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15190892#comment-15190892
] 

Hadoop QA commented on HBASE-15392:
-----------------------------------

| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 0m 12s {color} | {color:blue}
Docker mode activated. {color} |
| {color:green}+1{color} | {color:green} hbaseanti {color} | {color:green} 0m 0s {color} |
{color:green} Patch does not have any anti-patterns. {color} |
| {color:green}+1{color} | {color:green} @author {color} | {color:green} 0m 0s {color} | {color:green}
The patch does not contain any @author tags. {color} |
| {color:green}+1{color} | {color:green} test4tests {color} | {color:green} 0m 0s {color}
| {color:green} The patch appears to include 3 new or modified test files. {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 3m 6s {color}
| {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 38s {color} |
{color:green} master passed with JDK v1.8.0_74 {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 35s {color} |
{color:green} master passed with JDK v1.7.0_95 {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 4m 7s {color}
| {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 17s {color}
| {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 2m 3s {color} |
{color:green} master passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 36s {color} |
{color:green} master passed with JDK v1.8.0_74 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 35s {color} |
{color:green} master passed with JDK v1.7.0_95 {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 0m 46s {color}
| {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 44s {color} |
{color:green} the patch passed with JDK v1.8.0_74 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 0m 44s {color} | {color:green}
the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 36s {color} |
{color:green} the patch passed with JDK v1.7.0_95 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 0m 36s {color} | {color:green}
the patch passed {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red} 4m 5s {color} | {color:red}
hbase-server: patch generated 10 new + 175 unchanged - 9 fixed = 185 total (was 184) {color}
|
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 18s {color}
| {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green} 0m 0s {color}
| {color:green} Patch has no whitespace issues. {color} |
| {color:green}+1{color} | {color:green} hadoopcheck {color} | {color:green} 26m 55s {color}
| {color:green} Patch does not cause any errors with Hadoop 2.4.0 2.4.1 2.5.0 2.5.1 2.5.2
2.6.1 2.6.2 2.6.3 2.7.1. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 2m 14s {color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 32s {color} |
{color:green} the patch passed with JDK v1.8.0_74 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 35s {color} |
{color:green} the patch passed with JDK v1.7.0_95 {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 64m 26s {color} | {color:red}
hbase-server in the patch failed with JDK v1.8.0_74. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 110m 21s {color} | {color:green}
hbase-server in the patch passed with JDK v1.7.0_95. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m 18s {color}
| {color:green} Patch does not generate ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black} 224m 35s {color} | {color:black}
{color} |
\\
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|| Reason || Tests ||
| JDK v1.8.0_74 Timed out junit tests | org.apache.hadoop.hbase.master.procedure.TestServerCrashProcedure
|
|   | org.apache.hadoop.hbase.master.procedure.TestModifyTableProcedure |
|   | org.apache.hadoop.hbase.snapshot.TestSnapshotClientRetries |
|   | org.apache.hadoop.hbase.master.balancer.TestStochasticLoadBalancer2 |
|   | org.apache.hadoop.hbase.master.TestMasterFailover |
|   | org.apache.hadoop.hbase.coprocessor.TestRegionObserverScannerOpenHook |
|   | org.apache.hadoop.hbase.wal.TestWALFiltering |
|   | org.apache.hadoop.hbase.coprocessor.TestRegionServerObserver |
|   | org.apache.hadoop.hbase.wal.TestDefaultWALProviderWithHLogKey |
|   | org.apache.hadoop.hbase.TestZooKeeper |
|   | org.apache.hadoop.hbase.wal.TestWALSplitCompressed |
|   | org.apache.hadoop.hbase.util.hbck.TestOfflineMetaRebuildHole |
|   | org.apache.hadoop.hbase.client.TestMetaWithReplicas |
|   | org.apache.hadoop.hbase.util.TestHBaseFsckEncryption |
|   | org.apache.hadoop.hbase.master.TestTableLockManager |
|   | org.apache.hadoop.hbase.master.procedure.TestMasterFailoverWithProcedures |
|   | org.apache.hadoop.hbase.master.TestSplitLogManager |
|   | org.apache.hadoop.hbase.master.procedure.TestWALProcedureStoreOnHDFS |
|   | org.apache.hadoop.hbase.TestClusterBootOrder |
|   | org.apache.hadoop.hbase.util.hbck.TestOfflineMetaRebuildOverlap |
|   | org.apache.hadoop.hbase.master.TestRollingRestart |
|   | org.apache.hadoop.hbase.master.balancer.TestStochasticLoadBalancer |
|   | org.apache.hadoop.hbase.regionserver.TestRegionMergeTransactionOnCluster |
|   | org.apache.hadoop.hbase.util.TestMiniClusterLoadEncoded |
|   | org.apache.hadoop.hbase.io.encoding.TestDataBlockEncoders |
|   | org.apache.hadoop.hbase.util.TestMiniClusterLoadSequential |
|   | org.apache.hadoop.hbase.util.TestFanOutOneBlockAsyncDFSOutput |
|   | org.apache.hadoop.hbase.master.TestMasterShutdown |
|   | org.apache.hadoop.hbase.io.hfile.TestScannerSelectionUsingTTL |
|   | org.apache.hadoop.hbase.mob.TestExpiredMobFileCleaner |
|   | org.apache.hadoop.hbase.master.TestAssignmentManagerOnCluster |
|   | org.apache.hadoop.hbase.TestAcidGuarantees |
|   | org.apache.hadoop.hbase.TestGlobalMemStoreSize |
|   | org.apache.hadoop.hbase.io.hfile.TestSeekBeforeWithInlineBlocks |
|   | org.apache.hadoop.hbase.zookeeper.lock.TestZKInterProcessReadWriteLock |
|   | org.apache.hadoop.hbase.io.hfile.TestForceCacheImportantBlocks |
|   | org.apache.hadoop.hbase.io.hfile.TestHFileBlockIndex |
|   | org.apache.hadoop.hbase.TestMovedRegionsCleaner |
|   | org.apache.hadoop.hbase.TestRegionRebalancing |
|   | org.apache.hadoop.hbase.security.visibility.TestVisibilityLabelReplicationWithExpAsString
|
|   | org.apache.hadoop.hbase.security.visibility.TestVisibilityLabelsReplication |
|   | org.apache.hadoop.hbase.TestHBaseOnOtherDfsCluster |
|   | org.apache.hadoop.hbase.util.TestMergeTable |
|   | org.apache.hadoop.hbase.util.hbck.TestOfflineMetaRebuildBase |
|   | org.apache.hadoop.hbase.util.TestMergeTool |
|   | org.apache.hadoop.hbase.master.snapshot.TestSnapshotFileCache |
|   | org.apache.hadoop.hbase.master.TestMasterNoCluster |
|   | org.apache.hadoop.hbase.master.TestRestartCluster |
|   | org.apache.hadoop.hbase.TestIOFencing |
|   | org.apache.hadoop.hbase.util.TestMiniClusterLoadParallel |
|   | org.apache.hadoop.hbase.io.hfile.TestCacheOnWrite |
|   | org.apache.hadoop.hbase.io.encoding.TestLoadAndSwitchEncodeOnDisk |
|   | org.apache.hadoop.hbase.client.TestTableSnapshotScanner |
|   | org.apache.hadoop.hbase.replication.regionserver.TestReplicationWALReaderManager |
|   | org.apache.hadoop.hbase.fs.TestBlockReorder |
|   | org.apache.hadoop.hbase.wal.TestDefaultWALProvider |
|   | org.apache.hadoop.hbase.coprocessor.TestRegionServerCoprocessorExceptionWithAbort |
|   | org.apache.hadoop.hbase.util.TestConnectionCache |
|   | org.apache.hadoop.hbase.replication.TestMultiSlaveReplication |
|   | org.apache.hadoop.hbase.io.hfile.TestHFileBlock |
|   | org.apache.hadoop.hbase.wal.TestBoundedRegionGroupingStrategy |
|   | org.apache.hadoop.hbase.wal.TestWALFactory |
|   | org.apache.hadoop.hbase.mapreduce.TestTableSnapshotInputFormat |
|   | org.apache.hadoop.hbase.replication.TestMasterReplication |
|   | org.apache.hadoop.hbase.io.TestFileLink |
|   | org.apache.hadoop.hbase.mapred.TestTableSnapshotInputFormat |
|   | org.apache.hadoop.hbase.util.TestFSUtils |
|   | org.apache.hadoop.hbase.io.encoding.TestBufferedDataBlockEncoder |
|   | org.apache.hadoop.hbase.io.encoding.TestEncodedSeekers |
|   | org.apache.hadoop.hbase.wal.TestWALSplit |
\\
\\
|| Subsystem || Report/Notes ||
| Docker | Client=1.9.1 Server=1.9.1 Image:yetus/hbase:date2016-03-11 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12792672/15392v5.patch
|
| JIRA Issue | HBASE-15392 |
| Optional Tests |  asflicense  javac  javadoc  unit  findbugs  hadoopcheck  hbaseanti  checkstyle
 compile  |
| uname | Linux 738cef1af5f9 3.13.0-36-lowlatency #63-Ubuntu SMP PREEMPT Wed Sep 3 21:56:12
UTC 2014 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /home/jenkins/jenkins-slave/workspace/PreCommit-HBASE-Build/component/dev-support/hbase-personality.sh
|
| git revision | master / eea8b38 |
| Default Java | 1.7.0_95 |
| Multi-JDK versions |  /usr/lib/jvm/java-8-oracle:1.8.0_74 /usr/lib/jvm/java-7-openjdk-amd64:1.7.0_95
|
| findbugs | v3.0.0 |
| checkstyle | https://builds.apache.org/job/PreCommit-HBASE-Build/941/artifact/patchprocess/diff-checkstyle-hbase-server.txt
|
| unit | https://builds.apache.org/job/PreCommit-HBASE-Build/941/artifact/patchprocess/patch-unit-hbase-server-jdk1.8.0_74.txt
|
| unit test logs |  https://builds.apache.org/job/PreCommit-HBASE-Build/941/artifact/patchprocess/patch-unit-hbase-server-jdk1.8.0_74.txt
|
| JDK v1.7.0_95  Test Results | https://builds.apache.org/job/PreCommit-HBASE-Build/941/testReport/
|
| modules | C: hbase-server U: hbase-server |
| Console output | https://builds.apache.org/job/PreCommit-HBASE-Build/941/console |
| Powered by | Apache Yetus 0.2.0   http://yetus.apache.org |


This message was automatically generated.



> 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, 15392v5.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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