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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:
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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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