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https://issues.apache.org/jira/browse/HBASE-14272?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14731737#comment-14731737
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Andrew Purtell commented on HBASE-14272:
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It is an interesting problem. Cells with expired ttls will be ignored but if
there are many of them performance is unduly affected. I suppose we could, if
we can determine the approximate % of expired cells - and at this point we are
scanning the hfile and might as well be compacting? - we could trigger
compaction if above a threshold. I suppose a scan is still cheaper than
rewriting the file.
> 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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