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https://issues.apache.org/jira/browse/HBASE-14272?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14731789#comment-14731789
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Lars Hofhansl commented on HBASE-14272:
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I suppose we already collect a bunch of information during a compaction
(earliest Put, average KV size, etc), could keep a flag when there are any
delete markers. If true and KEEP_DELETED_CELLS is OFF, we can definitely get
rid of some delete markers.
Now, dealing with TTL is harder, since it is moving target. I supposed when
MIN_VERSIONS is not set and TTL is set we will get rid of some each time.
I think we missed all these issues when we added logic to avoid the time based
major compaction when there is (ostensibly) nothing to collect.
> Enforce major compaction on stores with KEEP_DELETED_CELLS=true
> ---------------------------------------------------------------
>
> Key: HBASE-14272
> URL: https://issues.apache.org/jira/browse/HBASE-14272
> Project: HBase
> Issue Type: Bug
> Reporter: Vladimir Rodionov
> Assignee: Vladimir Rodionov
> Fix For: 2.0.0
>
> Attachments: HBASE-14272-v2.patch, HBASE-14272.patch
>
>
> Currently, if store has one (major compacted) file, the only case when major
> compaction will be triggered for this file again - when locality is below
> threshold, defined by *hbase.hstore.min.locality.to.skip.major.compact* or
> TTL expired some cells. If file has locality greater than this threshold it
> will never be major compacted until Store's TTL kicks in. For CF with
> KEEP_DELETED_CELLS on, compaction must be enabled always (even for single
> file), regardless of locality, when deleted cells are expired
> (*hbase.hstore.time.to.purge.deletes*)
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