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From "Matteo Bertozzi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14302) TableSnapshotInputFormat should not create back references when restoring snapshot
Date Mon, 24 Aug 2015 22:34:46 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14302?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14710178#comment-14710178
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Matteo Bertozzi commented on HBASE-14302:
-----------------------------------------

am i missing something or is this not creating backref by default? shouldn't be an option?
otherwise you have to keep in mind to not drop a snapshot while the job is running.

> TableSnapshotInputFormat should not create back references when restoring snapshot
> ----------------------------------------------------------------------------------
>
>                 Key: HBASE-14302
>                 URL: https://issues.apache.org/jira/browse/HBASE-14302
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Enis Soztutar
>            Assignee: Enis Soztutar
>             Fix For: 2.0.0, 1.2.0, 1.3.0, 1.0.3, 1.1.3
>
>         Attachments: hbase-14302_v1.patch
>
>
> TableSnapshotInputFormat restores the snapshot to a temporary directory that is outside
the HBase's root directory so that it can read from the restored snapshot and also refer to
hfiles in the actual root directory. 
> In restoring the snapshot, we create new hfilelinks in the ephemeral location. Creating
new hfile links also creates "back references" for GC. These back references are dangling
since the restore location is outside the root dir, and requires a WRITE permission to the
root dir (as opposed to just READ permission) to be able to run the MR-over-snapshot job.




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