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From "ASF GitHub Bot (JIRA)" <>
Subject [jira] [Work logged] (HIVE-21841) Leader election in HMS to run housekeeping tasks.
Date Mon, 17 Jun 2019 06:06:00 GMT


ASF GitHub Bot logged work on HIVE-21841:

                Author: ASF GitHub Bot
            Created on: 17/Jun/19 06:05
            Start Date: 17/Jun/19 06:05
    Worklog Time Spent: 10m 
      Work Description: ashutosh-bapat commented on pull request #668: HIVE-21841 : Add configuration
to specify the hostname of HMS leader …to run housekeeping tasks in.

 File path: standalone-metastore/metastore-common/src/main/java/org/apache/hadoop/hive/metastore/conf/
 @@ -386,6 +386,12 @@ public static ConfVars getMetaConf(String name) {
         new RangeValidator(1, 20), "Number of consecutive compaction failures (per table/partition)
" +
         "after which automatic compactions will not be scheduled any more.  Note that this
must be less " +
         "than hive.compactor.history.retention.failed."),
+    METASTORE_HOUSEKEEPING_LEADER_HOSTNAME("metastore.housekeeping.leader.hostname",
+            "hive.metastore.housekeeping.leader.hostname", "",
+"If there are multiple Thrift metastore services running, the hostname of Thrift metastore
" +
 Review comment:
   Yes. I didn't get any warnings from checkstyle on this one.
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Issue Time Tracking

    Worklog Id:     (was: 261168)
    Time Spent: 1h 20m  (was: 1h 10m)

> Leader election in HMS to run housekeeping tasks.
> -------------------------------------------------
>                 Key: HIVE-21841
>                 URL:
>             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
>          Time Spent: 1h 20m
>  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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