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https://issues.apache.org/jira/browse/HBASE-14302?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Enis Soztutar updated HBASE-14302:
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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 now.
> 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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