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https://issues.apache.org/jira/browse/HBASE-17112?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15672929#comment-15672929
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Anoop Sam John commented on HBASE-17112:
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Ya make sense.. Ya I agree this solves a bigger problem than the new possible
issue (which is rare). Pls add some comments abt the new possile issue and ref
to new Jira for the MVCC centric logic.
Am +1
> Prevent setting timestamp of delta operations being same as previous value's
> ----------------------------------------------------------------------------
>
> Key: HBASE-17112
> URL: https://issues.apache.org/jira/browse/HBASE-17112
> Project: HBase
> Issue Type: Bug
> Affects Versions: 1.1.7, 0.98.23, 1.2.4
> Reporter: Phil Yang
> Assignee: Phil Yang
> Attachments: HBASE-17112-branch-1-v1.patch,
> HBASE-17112-branch-1.1-v1.patch, HBASE-17112-v1.patch, HBASE-17112-v2.patch
>
>
> In delta operations, Increment and Append. We will read current value first
> and then write the new whole result into WAL as the type of Put with current
> timestamp. If the previous ts is larger than current ts, we will use the
> previous ts.
> If we have two Puts with same TS, we will ignore the Put with lower sequence
> id. It is not friendly with versioning. And for replication we will drop
> sequence id while writing to peer cluster so in the slave we don't know what
> the order they are being written. If the pushing is disordered, the result
> will be wrong.
> We can set the new ts to previous+1 if the previous is not less than now.
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