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https://issues.apache.org/jira/browse/HBASE-5199?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13186029#comment-13186029
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Lars Hofhansl commented on HBASE-5199:
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Need to pay some special attention to specific delete-marker TTL that FB added
(i.e. a delete marker could outlive the TTL of a store). Can't find the jira
for that right, but it was committed relatively recently.
> Delete out of TTL store files before compaction selection
> ---------------------------------------------------------
>
> Key: HBASE-5199
> URL: https://issues.apache.org/jira/browse/HBASE-5199
> Project: HBase
> Issue Type: Improvement
> Reporter: Liyin Tang
> Assignee: Liyin Tang
>
> Currently, HBase deletes the out of TTL store files after major compaction.
> We can change the sequence to delete the out of TTL store files before
> selecting store files for compactions.
> In this way, HBase can keep deleting the old invalid store files without
> major compaction, and also prevent from unnecessary major compactions since
> the out of TTL store files will be deleted before the compaction selection.
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