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https://issues.apache.org/jira/browse/PHOENIX-4053?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16105649#comment-16105649
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James Taylor commented on PHOENIX-4053:
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Confirmed that row lock became a read lock from HBase 1.2+.
> Lock row exclusively when necessary for mutable secondary indexing
> ------------------------------------------------------------------
>
> Key: PHOENIX-4053
> URL: https://issues.apache.org/jira/browse/PHOENIX-4053
> Project: Phoenix
> Issue Type: Bug
> Reporter: James Taylor
> Assignee: James Taylor
> Attachments: PHOENIX-4053_wip.patch
>
>
> In HBase 1.3, it turns out that rows are not exclusively locked when the
> preBatchMutate call is made. The mutable secondary index (global and local)
> depend on this to get a consistent snapshot of a row. This will likely get
> fixed in HBASE-18474, but we need to guard against this ourselves.
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