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https://issues.apache.org/jira/browse/HIVE-12221?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14967832#comment-14967832
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Sushanth Sowmyan commented on HIVE-12221:
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Per Roshan's mail to me, adding in a reference :
https://en.wikipedia.org/wiki/Double-checked_locking#Usage_in_Java
> Concurrency issue in HCatUtil.getHiveMetastoreClient()
> -------------------------------------------------------
>
> Key: HIVE-12221
> URL: https://issues.apache.org/jira/browse/HIVE-12221
> Project: Hive
> Issue Type: Bug
> Reporter: Roshan Naik
>
> HCatUtil.getHiveMetastoreClient() uses double checked locking pattern
> to implement singleton, which is a broken pattern
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