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From "Ashutosh Bapat (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-21841) Leader election in HMS to run housekeeping tasks.
Date Tue, 18 Jun 2019 10:26:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-21841?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ashutosh Bapat updated HIVE-21841:
----------------------------------
    Attachment: HIVE-21841.06.patch
        Status: Patch Available  (was: In Progress)

The failed testcases in the last run are passing locally on my laptop. Re-attaching the 05
patch again as 06.

> Leader election in HMS to run housekeeping tasks.
> -------------------------------------------------
>
>                 Key: HIVE-21841
>                 URL: https://issues.apache.org/jira/browse/HIVE-21841
>             Project: Hive
>          Issue Type: New Feature
>    Affects Versions: 4.0.0
>            Reporter: Ashutosh Bapat
>            Assignee: Ashutosh Bapat
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 4.0.0
>
>         Attachments: HIVE-21841.01.patch, HIVE-21841.02.patch, HIVE-21841.04.patch, HIVE-21841.05.patch,
HIVE-21841.06.patch
>
>          Time Spent: 3.5h
>  Remaining Estimate: 0h
>
> HMS performs housekeeping tasks. When there are multiple HMSes we need to have a leader
HMS elected which will carry out those housekeeping tasks. 
> These tasks include execution of compaction tasks, auto-discovering partitions for external
tables, generation of compaction tasks, repl thread etc.
> Note that, though the code for compaction tasks, auto-discovery of partitions etc. is
in Hive, the actual tasks are initiated by an HMS configured to do so. So, leader election
is required only for HMS and not for HS2.



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