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https://issues.apache.org/jira/browse/HIVE-5474?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13793154#comment-13793154
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Ashutosh Chauhan commented on HIVE-5474:
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Thats correct.. dedup logic would still be required.. but using set makes the 
intent clear that we cannot have duplicates which are possible in list.

> drop table hangs when concurrency=true
> --------------------------------------
>
>                 Key: HIVE-5474
>                 URL: https://issues.apache.org/jira/browse/HIVE-5474
>             Project: Hive
>          Issue Type: Bug
>          Components: HiveServer2, Locking
>            Reporter: Thejas M Nair
>            Assignee: Jason Dere
>         Attachments: HIVE-5474.1.patch, HIVE-5474.2.patch
>
>
> This is seen in hive 0.12 branch sequential test run. 
> TestThriftHttpCLIService.testExecuteStatement
> https://builds.apache.org/job/Hive-branch-0.12-hadoop1/13/testReport/org.apache.hive.service.cli.thrift/TestThriftHttpCLIService/testExecuteStatement/
> stderr has "FAILED: Error in acquiring locks: Locks on the underlying
> objects cannot be acquired. retry after some time"



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