TestAtomicOperation.testMultiRowMutationMultiThreads fails occasionally
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                 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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