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https://issues.apache.org/jira/browse/HIVE-10595?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14528863#comment-14528863
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Alan Gates commented on HIVE-10595:
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More details:
# Dropping a table did not impact the initiator thread, as it could already
handle not finding a table. However, it was assuming that all such cases were
temp tables.
# Dropping a table before the worker thread or cleaner thread got to it caused
bogus error messages. In the case of the worker it also prevented forward
progress on compacting any other requests, as the dropped table stayed at the
head of the queue.
# Dropping a partition before any of the threads got to it caused the
compaction do to be done against the table rather than the partition, which
would result in an error once the compaction work started.
> Dropping a table can cause NPEs in the compactor
> ------------------------------------------------
>
> Key: HIVE-10595
> URL: https://issues.apache.org/jira/browse/HIVE-10595
> Project: Hive
> Issue Type: Bug
> Components: Metastore
> Affects Versions: 0.14.0, 1.0.0, 1.1.0
> Reporter: Alan Gates
> Assignee: Alan Gates
>
> Reproduction:
> # start metastore with compactor off
> # insert enough entries in a table to trigger a compaction
> # drop the table
> # stop metastore
> # restart metastore with compactor on
> Result: NPE in the compactor threads. I suspect this would also happen if
> the inserts and drops were done in between a run of the compactor, but I
> haven't proven it.
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