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https://issues.apache.org/jira/browse/HBASE-8759?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13688988#comment-13688988
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Lars Hofhansl edited comment on HBASE-8759 at 6/20/13 9:05 AM:
---------------------------------------------------------------
NP. I should also be a bit more explicit how family delete markets are actually
deleted. The logic is this:
Each compaction registers the timestamp of the oldest put in the created hfile.
The next (major) compaction then removes all family markers that are older than
the oldest put. So as long as the client does not keep backdating puts,
eventually all family markers drop out of the compacted files.
was (Author: lhofhansl):
NP. I should also be a bit more explicit how family delete markets are
actually deleted. The logic is this:
Each compaction registers the timestamp of the oldest put in the created hfile.
The next (major) compaction then removes all family markers that are older than
the oldest put. So as long as the client does not keep puts, eventually all
family markers drop out of the compacted files.
> Family Delete Markers not getting purged after major compaction
> ---------------------------------------------------------------
>
> Key: HBASE-8759
> URL: https://issues.apache.org/jira/browse/HBASE-8759
> Project: HBase
> Issue Type: Bug
> Components: Compaction
> Affects Versions: 0.94.7
> Reporter: Mujtaba Chohan
> Priority: Minor
>
> On table with VERSIONS => '1', KEEP_DELETED_CELLS => 'true'. Family Delete
> Markers does not get purged after put > delete > major compaction (they keep
> on incrementing after every put > delete > major compaction)
> Following is the raw scan output after 10 iterations of put > delete > major
> compaction.
> ROW COLUMN+CELL
>
>
> A column=CF:, timestamp=1371512706683,
> type=DeleteFamily
>
> A column=CF:, timestamp=1371512706394,
> type=DeleteFamily
>
> A column=CF:, timestamp=1371512706054,
> type=DeleteFamily
>
> A column=CF:, timestamp=1371512705763,
> type=DeleteFamily
>
> A column=CF:, timestamp=1371512705457,
> type=DeleteFamily
>
> A column=CF:, timestamp=1371512705149,
> type=DeleteFamily
>
> A column=CF:, timestamp=1371512704836,
> type=DeleteFamily
>
> A column=CF:, timestamp=1371512704518,
> type=DeleteFamily
>
> A column=CF:, timestamp=1371512704162,
> type=DeleteFamily
>
> A column=CF:, timestamp=1371512703779,
> type=DeleteFamily
>
> A column=CF:COL,
> timestamp=1371512706682, value=X
> [~lhofhansl]
> Code to repro this issue:
> http://phoenix-bin.github.io/client/code/delete.java
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