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https://issues.apache.org/jira/browse/HBASE-18806?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16309124#comment-16309124
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Ted Yu commented on HBASE-18806:
--------------------------------
Sounds good.
> 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, 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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