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Lars Hofhansl updated HBASE-5569: --------------------------------- Description: What I pieced together so far is that it is the *scanning* side that has problems sometimes. Every time I see a assertion failure in the log I see this before: {quote} 2012-03-12 21:48:49,523 DEBUG [Thread-211] regionserver.StoreScanner(499): Storescanner.peek() is changed where before = rowB/colfamily11:qual1/75366/Put/vlen=6,and after = rowB/colfamily11:qual1/75203/DeleteColumn/vlen=0 {quote} The order of if the Put and Delete is sometimes reversed. The test threads should always see exactly one KV, if the "before" was the Put the thread see 0 KVs, if the "before" was the Delete the threads see 2 KVs. This debug message comes from StoreScanner to checkReseek. It seems we still some consistency issue with scanning sometimes :( was: What I pieces together so far is that it is the *scanning* side that has problems sometimes. Every time I see a assertion failure in the log I see this before: {quote} 2012-03-12 21:48:49,523 DEBUG [Thread-211] regionserver.StoreScanner(499): Storescanner.peek() is changed where before = rowB/colfamily11:qual1/75366/Put/vlen=6,and after = rowB/colfamily11:qual1/75203/DeleteColumn/vlen=0 {quote} The order of if the Put and Delete is sometimes reversed. The test threads should always see exactly one KV, if the "before" was the Put the thread see 0 KVs, if the "before" was the Delete the threads see 2 KVs. This debug message comes from StoreScanner to checkReseek. It seems we still some consistency issue with scanning sometimes :( > TestAtomicOperation.testMultiRowMutationMultiThreads fails occasionally > ----------------------------------------------------------------------- > > Key: HBASE-5569 > URL: https://issues.apache.org/jira/browse/HBASE-5569 > Project: HBase > Issue Type: Bug > Reporter: Lars Hofhansl > Priority: Minor > > What I pieced together so far is that it is the *scanning* side that has > problems sometimes. > Every time I see a assertion failure in the log I see this before: > {quote} > 2012-03-12 21:48:49,523 DEBUG [Thread-211] regionserver.StoreScanner(499): > Storescanner.peek() is changed where before = > rowB/colfamily11:qual1/75366/Put/vlen=6,and after = > rowB/colfamily11:qual1/75203/DeleteColumn/vlen=0 > {quote} > The order of if the Put and Delete is sometimes reversed. > The test threads should always see exactly one KV, if the "before" was the > Put the thread see 0 KVs, if the "before" was the Delete the threads see 2 > KVs. > This debug message comes from StoreScanner to checkReseek. It seems we still > some consistency issue with scanning sometimes :( -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira