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https://issues.apache.org/jira/browse/HBASE-18703?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16143477#comment-16143477
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Anoop Sam John commented on HBASE-18703:
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I think the inconsistency came when we done changes in order of ops in batch
mutate. I believe there was a jira raised in the past also. Forgot details and
whether we did some changes as per that or not. Thanks for the nice find.
> Inconsistent behavior for preBatchMutate in doMiniBatchMutate and
> processRowsWithLocks
> --------------------------------------------------------------------------------------
>
> Key: HBASE-18703
> URL: https://issues.apache.org/jira/browse/HBASE-18703
> Project: HBase
> Issue Type: Sub-task
> Components: Coprocessors
> Reporter: Duo Zhang
> Fix For: 2.0.0-alpha-3
>
>
> In doMiniBatchMutate, the preBatchMutate is called before building WAL, but
> in processRowsWithLocks, we suggest the RowProcessor implementation to build
> WAL in process method, which is ahead of preBatchMutate.
> If a CP modifies the mutations, especially if it removes some cells from the
> mutations, then the behavior of processRowsWithLocks is broken. The changes
> applied to memstore and WAL will be different. And there is no way to remove
> entries from a WALEdit through CP.
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