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From "Zheng Hu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-18806) VerifyRep by snapshot need not to restore snapshot for each mapper
Date Thu, 21 Sep 2017 04:17:01 GMT

    [ https://issues.apache.org/jira/browse/HBASE-18806?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16174251#comment-16174251

Zheng Hu commented on HBASE-18806:

Upload patch v3 for fixing the v2's comment in RB. 

bq. Have you tried it (or backport) on cluster ? 
Not backport to our cluster yet.   Let's see the result of Hadoop QA first.  Later I'll try
to test in our cluster. 

> VerifyRep by snapshot need not to restore snapshot for each mapper
> ------------------------------------------------------------------
>                 Key: HBASE-18806
>                 URL: https://issues.apache.org/jira/browse/HBASE-18806
>             Project: HBase
>          Issue Type: Improvement
>          Components: Replication
>    Affects Versions: 2.0.0-alpha-2
>            Reporter: Zheng Hu
>            Assignee: Zheng Hu
>         Attachments: HBASE-18806.v1.patch, HBASE-18806.v2.patch, HBASE-18806.v3.patch
> In following method stack,  seems like each mapper task will restore the snapshot.  
If we verify replication  by a snapshot which has many hfiles,  then we will take long time
to restore snapshot.   In our  cluster,   we took ~30min for the snapshot restoring when verify
a big table.
> {code}
> Verifier.map
>     |-------->  replicatedScanner = new TableSnapshotScanner(...)
>                                                                 |-------->  TableSnapshotScanner.init()
     |-----> RestoreSnapshotHelper.copySnapshotForScanner
> {code} 

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