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Date: Tue, 19 Sep 2017 02:31:02 +0000 (UTC)
From: "Zheng Hu (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <JIRA.13101931.1505302184000.142758.1505788262765@Atlassian.JIRA>
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Subject: [jira] [Commented] (HBASE-18806) VerifyRep by snapshot need not to
 restore snapshot for each mapper
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archived-at: Tue, 19 Sep 2017 02:31:10 -0000


    [ https://issues.apache.org/jira/browse/HBASE-18806?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16171015#comment-16171015 ] 

Zheng Hu commented on HBASE-18806:
----------------------------------

Hi [~tedyu],  Thanks for the reviewing ..  Any other concerns for patch v2 ? 

> 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
>
>
> 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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