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https://issues.apache.org/jira/browse/HBASE-5659?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13420403#comment-13420403
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chunhui shen commented on HBASE-5659:
-------------------------------------
About the patch, I don't think so, it will affect the scan's correctness again
Why Storescanner.peek() will be changed when checkReseek()(Only do this action
after Flush or Compaction), in current logic it shouldn't happen as per MVCC
> TestAtomicOperation.testMultiRowMutationMultiThreads is still failing
> occasionally
> ----------------------------------------------------------------------------------
>
> Key: HBASE-5659
> URL: https://issues.apache.org/jira/browse/HBASE-5659
> Project: HBase
> Issue Type: Sub-task
> Reporter: Lars Hofhansl
> Assignee: Lars Hofhansl
> Priority: Minor
> Fix For: 0.96.0, 0.94.2
>
> Attachments: 5659-v2.txt, 5659.txt
>
>
> See run here:
> https://builds.apache.org/job/PreCommit-HBASE-Build/1318//testReport/org.apache.hadoop.hbase.regionserver/TestAtomicOperation/testMultiRowMutationMultiThreads/
> {quote}
> 2012-03-27 04:36:12,627 DEBUG [Thread-118] regionserver.StoreScanner(499):
> Storescanner.peek() is changed where before =
> rowB/colfamily11:qual1/7202/Put/vlen=6/ts=7922,and after =
> rowB/colfamily11:qual1/7199/DeleteColumn/vlen=0/ts=0
> 2012-03-27 04:36:12,629 INFO [Thread-121] regionserver.HRegion(1558):
> Finished memstore flush of ~2.9k/2952, currentsize=1.6k/1640 for region
> testtable,,1332822963417.7cd30e219714cfc5e91f69def66e7f81. in 14ms,
> sequenceid=7927, compaction requested=true
> 2012-03-27 04:36:12,629 DEBUG [Thread-126]
> regionserver.TestAtomicOperation$2(362): flushing
> 2012-03-27 04:36:12,630 DEBUG [Thread-126] regionserver.HRegion(1426):
> Started memstore flush for
> testtable,,1332822963417.7cd30e219714cfc5e91f69def66e7f81., current region
> memstore size 1.9k
> 2012-03-27 04:36:12,630 DEBUG [Thread-126] regionserver.HRegion(1474):
> Finished snapshotting
> testtable,,1332822963417.7cd30e219714cfc5e91f69def66e7f81., commencing wait
> for mvcc, flushsize=1968
> 2012-03-27 04:36:12,630 DEBUG [Thread-126] regionserver.HRegion(1484):
> Finished snapshotting, commencing flushing stores
> 2012-03-27 04:36:12,630 DEBUG [Thread-126] util.FSUtils(153): Creating
> file=/home/jenkins/jenkins-slave/workspace/PreCommit-HBASE-Build/trunk/target/test-data/b9091c3c-961e-4035-850a-83ad14d517cc/TestAtomicOperationtestMultiRowMutationMultiThreads/testtable/7cd30e219714cfc5e91f69def66e7f81/.tmp/61954619003e469baf1a34be5ff2ec57
> with permission=rwxrwxrwx
> 2012-03-27 04:36:12,631 DEBUG [Thread-126] hfile.HFileWriterV2(143):
> Initialized with CacheConfig:enabled [cacheDataOnRead=true]
> [cacheDataOnWrite=false] [cacheIndexesOnWrite=false]
> [cacheBloomsOnWrite=false] [cacheEvictOnClose=false] [cacheCompressed=false]
> 2012-03-27 04:36:12,631 INFO [Thread-126]
> regionserver.StoreFile$Writer(997): Delete Family Bloom filter type for
> /home/jenkins/jenkins-slave/workspace/PreCommit-HBASE-Build/trunk/target/test-data/b9091c3c-961e-4035-850a-83ad14d517cc/TestAtomicOperationtestMultiRowMutationMultiThreads/testtable/7cd30e219714cfc5e91f69def66e7f81/.tmp/61954619003e469baf1a34be5ff2ec57:
> CompoundBloomFilterWriter
> 2012-03-27 04:36:12,632 INFO [Thread-126]
> regionserver.StoreFile$Writer(1220): NO General Bloom and NO DeleteFamily was
> added to HFile
> (/home/jenkins/jenkins-slave/workspace/PreCommit-HBASE-Build/trunk/target/test-data/b9091c3c-961e-4035-850a-83ad14d517cc/TestAtomicOperationtestMultiRowMutationMultiThreads/testtable/7cd30e219714cfc5e91f69def66e7f81/.tmp/61954619003e469baf1a34be5ff2ec57)
>
> 2012-03-27 04:36:12,632 INFO [Thread-126] regionserver.Store(770): Flushed ,
> sequenceid=7934, memsize=1.9k, into tmp file
> /home/jenkins/jenkins-slave/workspace/PreCommit-HBASE-Build/trunk/target/test-data/b9091c3c-961e-4035-850a-83ad14d517cc/TestAtomicOperationtestMultiRowMutationMultiThreads/testtable/7cd30e219714cfc5e91f69def66e7f81/.tmp/61954619003e469baf1a34be5ff2ec57
> 2012-03-27 04:36:12,632 DEBUG [Thread-126] regionserver.Store(795): Renaming
> flushed file at
> /home/jenkins/jenkins-slave/workspace/PreCommit-HBASE-Build/trunk/target/test-data/b9091c3c-961e-4035-850a-83ad14d517cc/TestAtomicOperationtestMultiRowMutationMultiThreads/testtable/7cd30e219714cfc5e91f69def66e7f81/.tmp/61954619003e469baf1a34be5ff2ec57
> to
> /home/jenkins/jenkins-slave/workspace/PreCommit-HBASE-Build/trunk/target/test-data/b9091c3c-961e-4035-850a-83ad14d517cc/TestAtomicOperationtestMultiRowMutationMultiThreads/testtable/7cd30e219714cfc5e91f69def66e7f81/colfamily11/61954619003e469baf1a34be5ff2ec57
> 2012-03-27 04:36:12,634 INFO [Thread-126] regionserver.Store(818): Added
> /home/jenkins/jenkins-slave/workspace/PreCommit-HBASE-Build/trunk/target/test-data/b9091c3c-961e-4035-850a-83ad14d517cc/TestAtomicOperationtestMultiRowMutationMultiThreads/testtable/7cd30e219714cfc5e91f69def66e7f81/colfamily11/61954619003e469baf1a34be5ff2ec57,
> entries=12, sequenceid=7934, filesize=1.3k
> 2012-03-27 04:36:12,642 DEBUG [Thread-118]
> regionserver.TestAtomicOperation$2(392): []
> Exception in thread "Thread-118" junit.framework.AssertionFailedError at
> junit.framework.Assert.fail(Assert.java:48)
> at junit.framework.Assert.fail(Assert.java:56)
> at
> org.apache.hadoop.hbase.regionserver.TestAtomicOperation$2.run(TestAtomicOperation.java:394)
> 2012-03-27 04:36:12,643 INFO [Thread-126] regionserver.HRegion(1558):
> Finished memstore flush of ~1.9k/1968, currentsize=1.3k/1312 for region
> testtable,,1332822963417.7cd30e219714cfc5e91f69def66e7f81. in 14ms,
> sequenceid=7934, compaction requested=true
> {quote}
> I think this issue is different from parent.
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