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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-12948) Calling Increment#addColumn on the same column multiple times produces wrong result
Date Tue, 17 Feb 2015 18:20:12 GMT

     [ https://issues.apache.org/jira/browse/HBASE-12948?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ted Yu updated HBASE-12948:
---------------------------
    Summary: Calling Increment#addColumn on the same column multiple times produces wrong
result   (was: Increment#addColumn on the same column multi times produce wrong result )

> Calling Increment#addColumn on the same column multiple times produces 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
>            Assignee: hongyu bi
>            Priority: Critical
>         Attachments: 12948-v2.patch, HBASE-12948-0.99.2-v1.patch, HBASE-12948-v0.patch,
HBASE-12948.patch
>
>
> 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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