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https://issues.apache.org/jira/browse/HBASE-17196?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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huaxiang sun resolved HBASE-17196.
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Resolution: Invalid
As explained in the comments.
> deleted mob cell can come back after major compaction and minor mob compaction
> ------------------------------------------------------------------------------
>
> Key: HBASE-17196
> URL: https://issues.apache.org/jira/browse/HBASE-17196
> Project: HBase
> Issue Type: Bug
> Components: mob
> Affects Versions: 2.0.0
> Reporter: huaxiang sun
> Assignee: huaxiang sun
>
> In the following case, the deleted mob cell can come back.
> {code}
> 1) hbase(main):001:0> create 't1', {NAME => 'f1', IS_MOB => true,
> MOB_THRESHOLD => 10}
> 2) hbase(main):002:0> put 't1', 'r1', 'f1:q1', 'aaaaaaaaaaaaaaaaaaaa'
> 3) hbase(main):003:0> flush 't1'
> 4) hbase(main):004:0> deleteall 't1', 'r1'
> 5) hbase(main):005:0> scan 't1'
> ROW COLUMN+CELL
>
>
> 0 row(s)
> 6) hbase(main):006:0> flush 't1'
> 7) hbase(main):007:0> major_compact 't1'
> After that, go to mobdir, remove the _del file, this is to simulate the case
> that mob minor compaction does not the _del file. Right now, the cell in
> normal region is gone after the major compaction.
> 8) hbase(main):008:0> put 't1', 'r2', 'f1:q1', 'bbbbbbbbbbbbbbbbbbbbbbbb'
>
>
> 9) hbase(main):009:0> flush 't1'
> 10) hbase(main):010:0> scan 't1'
> ROW COLUMN+CELL
>
>
> r2 column=f1:q1,
> timestamp=1480451201393, value=bbbbbbbbbbbbbbbbbbbbbbbb
>
> 1 row(s)
> 11) hbase(main):011:0> compact 't1', 'f1', 'MOB'
> 12) hbase(main):012:0> scan 't1'
> ROW COLUMN+CELL
>
>
> r1 column=f1:q1,
> timestamp=1480450987725, value=aaaaaaaaaaaaaaaaaaaa
>
> r2 column=f1:q1,
> timestamp=1480451201393, value=bbbbbbbbbbbbbbbbbbbbbbbb
>
> 2 row(s)
> The deleted "r1" comes back. The reason is that mob minor compaction does not
> include _del files so it generates references for the deleted cell.
> {code}
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