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From "Lars Hofhansl (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-5569) TestAtomicOperation.testMultiRowMutationMultiThreads fails occasionally
Date Tue, 13 Mar 2012 04:41:43 GMT
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 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 :(


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