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https://issues.apache.org/jira/browse/HBASE-22648?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16893295#comment-16893295
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Anoop Sam John commented on HBASE-22648:
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Can you pls add a RN [~vjasani]. Will be very helpful for future ref.
> Snapshot TTL
> ------------
>
> Key: HBASE-22648
> URL: https://issues.apache.org/jira/browse/HBASE-22648
> Project: HBase
> Issue Type: New Feature
> Components: snapshots
> Affects Versions: 3.0.0
> Reporter: Andrew Purtell
> Assignee: Viraj Jasani
> Priority: Minor
> Fix For: 3.0.0, 1.5.0, 2.3.0
>
> Attachments: HBASE-22648-branch-1.patch, HBASE-22648-branch-1.patch,
> HBASE-22648-branch-2.patch, HBASE-22648-master-v2.patch,
> HBASE-22648-master-v3.patch, HBASE-22648-master-v4.patch,
> HBASE-22648-master-v5.patch, HBASE-22648-master-v6.patch,
> HBASE-22648-master-v8.patch, HBASE-22648-master.patch, Screen Shot 2019-07-10
> at 8.49.13 PM.png, Screen Shot 2019-07-10 at 8.52.30 PM.png, Screen Shot
> 2019-07-10 at 9.06.36 PM.png, Screen Shot 2019-07-16 at 11.06.03 AM.png
>
>
> Snapshots have a lifecycle that is independent from the table from which they
> are created. Although data in a table may be stored with TTL the data files
> containing them become frozen by the snapshot. Space consumed by expired
> cells will not be reclaimed by normal table housekeeping like compaction.
> While this is expected it can be inconvenient at scale. When many snapshots
> are under management and the data in various tables is expired by TTL some
> notion of optional TTL (and optional default TTL) for snapshots could be
> useful. It will help prevent the accumulation of junk files by automatically
> dropping the snapshot after the assigned TTL, making their data files
> eligible for cleaning. More comprehensive snapshot lifecycle management may
> be considered in the future but this one case is expected to be immediately
> useful given TTls on data are commonly applied for similar convenience.
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