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https://issues.apache.org/jira/browse/PHOENIX-1343?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14199905#comment-14199905
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James Taylor commented on PHOENIX-1343:
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There won't be a need to modify server and introduce any kind of locking for
transaction support. Instead, the transaction implementation would use snapshot
isolation and optimistic concurrency with conflict detection. Take a look at
Tephra as that what we're considering using:
https://github.com/caskdata/tephra/blob/develop/README.rst
> Array insert unique function
> ----------------------------
>
> Key: PHOENIX-1343
> URL: https://issues.apache.org/jira/browse/PHOENIX-1343
> Project: Phoenix
> Issue Type: New Feature
> Reporter: Vaclav Loffelmann
> Assignee: Vaclav Loffelmann
> Priority: Minor
>
> I'm working on function for insert unique values to an array. Logic should be
> implemented on region server coprocessor (for enforcing consistency and no
> network round trip). First step is to get current values of the array, merge
> with upsert values and write as new value.
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