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https://issues.apache.org/jira/browse/HBASE-10118?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13947428#comment-13947428
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Honghua Feng commented on HBASE-10118:
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bq.So i think if the special delete TTL is not set, we keep the behavior as
before and future deleted kvs are purged during major compaction. And when the
special delete TTL is set, the future deleted kvs are kept until kv.timestap()
+ delete TTL.
Delete TTL means 'time to purge deletes', right?
Make sense and patch looks good to me. +1
> Major compact keeps deletes with future timestamps
> --------------------------------------------------
>
> Key: HBASE-10118
> URL: https://issues.apache.org/jira/browse/HBASE-10118
> Project: HBase
> Issue Type: Bug
> Components: Compaction, Deletes, regionserver
> Reporter: Max Lapan
> Assignee: Liu Shaohui
> Priority: Minor
> Attachments: HBASE-10118-trunk-v1.diff
>
>
> Hello!
> During migration from HBase 0.90.6 to 0.94.6 we found changed behaviour in
> how major compact handles delete markers with timestamps in the future.
> Before HBASE-4721 major compact purged deletes regardless of their timestamp.
> Newer versions keep them in HFile until timestamp not reached.
> I guess this happened due to new check in ScanQueryMatcher
> {{EnvironmentEdgeManager.currentTimeMillis() - timestamp) <=
> timeToPurgeDeletes}}.
> This can be worked around by specifying large negative value in
> {{hbase.hstore.time.to.purge.deletes}} option, but, unfortunately, negative
> values are pulled up to zero by Math.max in HStore.java.
> Maybe, we are trying to do something weird by specifing delete timestamp in
> future, but HBASE-4721 definitely breaks old behaviour we rely on.
> Steps to reproduce this:
> {code}
> put 'test', 'delmeRow', 'delme:something', 'hello'
> flush 'test'
> delete 'test', 'delmeRow', 'delme:something', 1394161431061
> flush 'test'
> major_compact 'test'
> {code}
> Before major_compact we have two hfiles with the following:
> {code}
> first:
> K: delmeRow/delme:something/1384161431061/Put/vlen=5/ts=0
> second:
> K: delmeRow/delme:something/1394161431061/DeleteColumn/vlen=0/ts=0
> {code}
> After major compact we get the following:
> {code}
> K: delmeRow/delme:something/1394161431061/DeleteColumn/vlen=0/ts=0
> {code}
> In our installation, we resolved this by removing Math.max and setting
> hbase.hstore.time.to.purge.deletes to Integer.MIN_VALUE, which purges delete
> markers, and it looks like a solution. But, maybe, there are better approach.
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