[jira] [Commented] (HIVE-23521) REPL: Optimise partition loading during bootstrap

["Aasha Medhi (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-23521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17123740#comment-17123740 ] 

Aasha Medhi commented on HIVE-23521:
------------------------------------

Patch looks fine. Could you please add tests for the same.

> REPL: Optimise partition loading during bootstrap
> -------------------------------------------------
>
>                 Key: HIVE-23521
>                 URL: https://issues.apache.org/jira/browse/HIVE-23521
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Rajesh Balamohan
>            Assignee: Rajesh Balamohan
>            Priority: Major
>         Attachments: HIVE-23521.1.patch, HIVE-23521.2.patch
>
>
> When bootstrapping with large "REPL dump" with ~10K partitions, it starts executing "addPartition" in sequential manner and takes very long time as it communicates with HMS/registers partition etc for every call.
> [https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/exec/repl/bootstrap/load/table/LoadPartitions.java#L399]
> [https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/exec/repl/bootstrap/load/table/LoadPartitions.java#L165]
> [https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/exec/repl/bootstrap/load/table/LoadPartitions.java#L210]
> When bootstrap loading has to deal with DDL, it would be good to collate all partitions in single call to HMS. This would help in reducing overall runtime.
>  



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