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https://issues.apache.org/jira/browse/HIVE-21694?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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mahesh kumar behera updated HIVE-21694:
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Attachment: HIVE-21694.01.patch
> Hive driver wait time is fixed for task getting executed in parallel.
> ---------------------------------------------------------------------
>
> Key: HIVE-21694
> URL: https://issues.apache.org/jira/browse/HIVE-21694
> Project: Hive
> Issue Type: Bug
> Components: HiveServer2
> Affects Versions: 4.0.0
> Reporter: mahesh kumar behera
> Assignee: mahesh kumar behera
> Priority: Major
> Fix For: 4.0.0
>
> Attachments: HIVE-21694.01.patch
>
>
> During a command execution hive driver executes the task in a separate thread
> if the task to be executed is set as parallel. After starting the task,
> driver checks if the task has finished execution or not. If the task
> execution is not finished it waits for 2 seconds before waking up again to
> check the task status. In case of task with execution time in milliseconds,
> this wait time can induce substantial overhead. So instead of fixed wait
> time, exponential backedup sleep time can be used to reduce the sleep
> overhead. The sleep time can start with 100ms and can increase up to 2
> seconds doubling on each iteration.
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