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https://issues.apache.org/jira/browse/HBASE-5569?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13228988#comment-13228988
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chunhui shen commented on HBASE-5569:
-------------------------------------
I think it's may the test case's problem.
Between the time thread1 execute
{code}region.mutateRowsWithLocks(mrm, rowsToLock);{code}
and
{code}
Scan s = new Scan(row);
RegionScanner rs = region.getScanner(s);
List<KeyValue> r = new ArrayList<KeyValue>();
while(rs.next(r));{code}
another thread2 may execute {code}
Put p = new Put(row2, ts);
p.add(fam1, qual1, value1);
mrm.add(p);
Delete d = new Delete(row);
d.deleteColumns(fam1, qual1, ts);
mrm.add(d);{code}, and it will delete row,
So thread1 may couldn't get any data.
suggestion if uncorrect,thanks.
> 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
> Attachments: TestAtomicOperation-output.trunk_120313.rar
>
>
> 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 :(
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