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https://issues.apache.org/jira/browse/HIVE-20725?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16646721#comment-16646721
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Gopal V commented on HIVE-20725:
--------------------------------
This belongs to a class of bugs fixed via - HIVE-14535
> Simultaneous dynamic inserts can result in partition files lost
> ----------------------------------------------------------------
>
> Key: HIVE-20725
> URL: https://issues.apache.org/jira/browse/HIVE-20725
> Project: Hive
> Issue Type: Bug
> Reporter: zhuwei
> Assignee: zhuwei
> Priority: Major
>
> If two users attempt a dynamic insert into the same new partition at the same
> time, a possible race condition exists which result in error state. In that
> case the partition info has been inserted to metastore but data files been
> removed.
> The current logic in function "add_partition_core" in class
> HiveMetaStore.HMSHandler is like this :
> # check if partition already exists
> # create the partition files directory if not exists
> # try to add partition
> # if add partition failed and it created the directory in step 2, delete
> that directory
> Assume that two users are inserting the same partition at the same time,
> there are two threads operating their requests, say thread A and thread B. If
> 1~4 steps of thread B are all done between step 2 and step 3 of thread A. The
> sequence like this : A1 A2 B1 B2 B3 B4 A3 A4. The partition files written by
> B will be removed by A.
>
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