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https://issues.apache.org/jira/browse/HIVE-15920?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15893546#comment-15893546
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Eugene Koifman commented on HIVE-15920:
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The patch implements the basic functionality to create a blocking call.
Adding a command to compact the whole partitioned table may be considered later.
[~wzheng] could you review?
The syntax is
alter table T compact 'major' AND WAIT"
Perhaps
alter table T compact 'major' NOWAIT"
should be supported for completeness
> Implement a blocking version of a command to compact
> ----------------------------------------------------
>
> Key: HIVE-15920
> URL: https://issues.apache.org/jira/browse/HIVE-15920
> Project: Hive
> Issue Type: Improvement
> Components: Transactions
> Reporter: Eugene Koifman
> Assignee: Eugene Koifman
> Attachments: HIVE-15920.01.patch
>
>
> currently
> {noformat}
> alter table AcidTable compact 'major'
> {noformat}
> is supported which enqueues a msg to compact.
> Would be nice for testing and script building to support
> {noformat}
> alter table AcidTable compact 'major' blocking
> {noformat}
> perhaps another variation is to block until either compaction is done or
> until cleaning is finished.
> DDLTask.compact() gets a request id back so it can then just block and wait
> for it using some new API
> may also be useful to let users compact all partitions but only if a
> separate queue has been set up for compaction jobs.
> The later is because with a 1M partition table, this may create very many
> jobs and saturate the cluster.
> This probably requires HIVE-12376 to make sure the compaction queue does the
> throttling, not the number of worker threads
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