[jira] [Work logged] (HIVE-26509) Introduce dynamic leader election in HMS

Sun, 18 Sep 2022 22:04:28 -0700 


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https://issues.apache.org/jira/browse/HIVE-26509?focusedWorklogId=809928&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-809928
 ]

ASF GitHub Bot logged work on HIVE-26509:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 19/Sep/22 05:03
            Start Date: 19/Sep/22 05:03
    Worklog Time Spent: 10m 
      Work Description: sonarcloud[bot] commented on PR #3567:
URL: https://github.com/apache/hive/pull/3567#issuecomment-1250572467

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Issue Time Tracking
-------------------

    Worklog Id:     (was: 809928)
    Time Spent: 1h 10m  (was: 1h)

> Introduce dynamic leader election in HMS
> ----------------------------------------
>
>                 Key: HIVE-26509
>                 URL: https://issues.apache.org/jira/browse/HIVE-26509
>             Project: Hive
>          Issue Type: New Feature
>          Components: Standalone Metastore
>            Reporter: Zhihua Deng
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 1h 10m
>  Remaining Estimate: 0h
>
> From HIVE-21841 we have a leader HMS selected by configuring 
> metastore.housekeeping.leader.hostname on startup. This approach saves us 
> from running duplicated HMS's housekeeping tasks cluster-wide. 
> In this jira, we introduce another dynamic leader election: adopt hive lock 
> to implement the leader election. Once a HMS owns the lock, then it becomes 
> the leader, carries out the housekeeping tasks, and sends heartbeats to renew 
> the lock before timeout. If the leader fails to reclaim the lock, then stops 
> the already started tasks if it has, the electing event is audited. We can 
> achieve a more dynamic leader when the original goes down or in the public 
> cloud without well configured property, and reduce the leader’s burdens by 
> running these tasks among different leaders.



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