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From "Enis Soztutar (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-14302) TableSnapshotInputFormat should not create back references when restoring snapshot
Date Mon, 24 Aug 2015 22:29:47 GMT

     [ https://issues.apache.org/jira/browse/HBASE-14302?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Enis Soztutar updated HBASE-14302:
    Attachment: hbase-14302_v1.patch

Straightforward patch with UT. Back references are not created and also WAL is not instantiated
per region at restore. 

I've tested this manually as well to confirm that snapshot MR job does not require W permission

> 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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