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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-21694) Hive driver wait time is fixed for task getting executed in parallel.
Date Mon, 06 May 2019 17:43:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-21694?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

ASF GitHub Bot updated HIVE-21694:
----------------------------------
    Labels: pull-request-available  (was: )

> 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
>              Labels: pull-request-available
>             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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