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https://issues.apache.org/jira/browse/PHOENIX-3535?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15762081#comment-15762081
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James Taylor commented on PHOENIX-3535:
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It's difficult to tell the context of the patch, but as long as we're not
trying to create the mutex table with every connection, I'm +1.
> Fix race condition in ConnectionQueryServicesImpl#acquireUpgradeMutex
> ---------------------------------------------------------------------
>
> Key: PHOENIX-3535
> URL: https://issues.apache.org/jira/browse/PHOENIX-3535
> Project: Phoenix
> Issue Type: Bug
> Reporter: Samarth Jain
> Attachments: PHOENIX-3535_v1.patch
>
>
> Conversation on HBASE-17300 revealed that concurrently creating a table,
> checking for its existence and performing an operation on it is fraught with
> races. This race condition is causing
> UpgradeIT#testConcurrentUpgradeThrowsUpgradeInProgressException to fail. We
> need to figure out a way for not creating/checking existence of the
> SYSTEM.MUTEX table.
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