huaxiang sun created HBASE-17196:
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Summary: 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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