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From "hongyu bi (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-12948) Increment#addColumn on the same column multi times produce wrong result
Date Fri, 30 Jan 2015 14:18:35 GMT
hongyu bi created HBASE-12948:
---------------------------------

             Summary: Increment#addColumn on the same column multi times produce wrong result

                 Key: HBASE-12948
                 URL: https://issues.apache.org/jira/browse/HBASE-12948
             Project: HBase
          Issue Type: Bug
          Components: Client, regionserver
            Reporter: hongyu bi
            Priority: Critical


Case:
Initially get('row1'):
rowkey=row1 value=1
run:
Increment increment = new Increment(Bytes.toBytes("row1"));
for (int i = 0; i < N; i++) {
        increment.addColumn(Bytes.toBytes("cf"), Bytes.toBytes("c"), 1)
}
hobi.increment(increment);

get('row1'):
if N=1 then result is 2 else if N>1 the result will always be 1

Cause:
https://issues.apache.org/jira/browse/HBASE-7114 let increment extent mutation which change
familyMap from NavigableMap to List, so from client side, we can buffer many edits on the
same column;
However, HRegion#increment use idx to iterate the get's results, here results.size<family.value().size
if N>1,so the latter edits on the same column won't match the condition {idx < results.size()
&& CellUtil.matchingQualifier(results.get(idx), kv) }, meantime the edits share the
same mvccVersion ,so this case happen.

Fix:
according to the put/delete#add on the same column behaviour ,
fix from server side: process "last edit wins on the same column" inside HRegion#increment
to maintenance  HBASE-7114's extension and keep the same result from 0.94.






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