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https://issues.apache.org/jira/browse/HBASE-29896?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on HBASE-29896 started by Junegunn Choi.
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> Raw scan incorrectly skips cells expired by cell-level TTL
> ----------------------------------------------------------
>
> Key: HBASE-29896
> URL: https://issues.apache.org/jira/browse/HBASE-29896
> Project: HBase
> Issue Type: Bug
> Reporter: Junegunn Choi
> Assignee: Junegunn Choi
> Priority: Minor
>
> h2. Problem
> Raw scan does not include cells expired by its cell TTL.
> {code}
> # Cell expired by CF TTL
> create 't', { NAME => 'd', TTL => 1 }
> put 't', 'row', 'd:foo', 'bar'
> scan 't'
> # Not visible, as expected
> scan 't', RAW => true
> # Expired row is visible
> # Cell expired by cell TTL
> create 't2', 'd'
> put 't2', 'row', 'd:foo', 'bar', TTL => 1
> scan 't2'
> # Not visible, as expected
> scan 't2', RAW => true
> # Expired row is not visible !!!
> {code}
> h2. Why do we care?
> We ran into a timeout while running the RegionMover.
> https://github.com/apache/hbase/blob/470fe193938f8daaed8183ab8175cc7351f2ef36/hbase-server/src/main/java/org/apache/hadoop/hbase/util/MoveWithAck.java#L113-L115
> - We had many expired cells with cell-level TTL.
> - The raw scanner used in {{MoveWithAck}} failed to return a row within the
> timeout because of the current behavior.
> h2. Fix
> In {{RawScanQueryMatcher.match()}}, exclude {{MatchCode.SKIP}} from the
> early-return check.
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