[jira] [Resolved] (HBASE-29896) Raw scan incorrectly skips cells expired by cell-level TTL

["Junegunn Choi (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-29896?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Junegunn Choi resolved HBASE-29896.
-----------------------------------
    Resolution: Fixed

> 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
>              Labels: pull-request-available
>             Fix For: 2.7.0, 3.0.0-beta-2, 2.6.5, 2.5.14
>
>
> h2. Problem
> Raw scan does not include cells expired by cell TTL.
> {code:java}
> # 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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