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https://issues.apache.org/jira/browse/HBASE-18471?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16130008#comment-16130008
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Chia-Ping Tsai commented on HBASE-18471:
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bq. the delete marker should always be read before any normal kv.
We may scan many useless delete marks if they are related to older PUT cells.
> The DeleteFamily cell is skipped when StoreScanner seeks to next column
> -----------------------------------------------------------------------
>
> Key: HBASE-18471
> URL: https://issues.apache.org/jira/browse/HBASE-18471
> Project: HBase
> Issue Type: Bug
> Components: Deletes, hbase, scan
> Affects Versions: 3.0.0, 1.3.0, 1.3.1, 2.0.0-alpha-1
> Reporter: Thomas Martens
> Assignee: Chia-Ping Tsai
> Priority: Critical
> Fix For: 2.0.0, 1.4.0, 1.3.2, 1.5.0, 1.2.7
>
> Attachments: HBASE-18471.branch-1.2.v0.patch, HBASE-18471.v0.patch,
> HBASE-18471.v1.patch, HBaseDmlTest.java
>
>
> The qualifier of a deleted row (with keep deleted cells true) re-appears
> after re-inserting the same row multiple times (with different timestamp)
> with an empty qualifier.
> Scenario:
> # Put row with family and qualifier (timestamp 1).
> # Delete entire row (timestamp 2).
> # Put same row again with family without qualifier (timestamp 3).
> A scan (latest version) returns the row with family without qualifier,
> version 3 (which is correct).
> # Put the same row again with family without qualifier (timestamp 4).
> A scan (latest version) returns multiple rows:
> * the row with family without qualifier, version 4 (which is correct).
> * the row with family with qualifier, version 1 (which is wrong).
> There is a test scenario attached.
> output:
> <LOG> 13:42:53,952 [main] client.HBaseAdmin - Started disable of test_dml
> <LOG> 13:42:55,801 [main] client.HBaseAdmin - Disabled test_dml
> <LOG> 13:42:57,256 [main] client.HBaseAdmin - Deleted test_dml
> <LOG> 13:42:58,592 [main] client.HBaseAdmin - Created test_dml
> Put row: 'myRow' with family: 'myFamily' with qualifier: 'myQualifier' with
> timestamp: '1'
> Scan printout =>
> Row: 'myRow', Timestamp: '1', Family: 'myFamily', Qualifier: 'myQualifier',
> Value: 'myValue'
> Delete row: 'myRow'
> Scan printout =>
> Put row: 'myRow' with family: 'myFamily' with qualifier: 'null' with
> timestamp: '3'
> Scan printout =>
> Row: 'myRow', Timestamp: '3', Family: 'myFamily', Qualifier: '', Value:
> 'myValue'
> Put row: 'myRow' with family: 'myFamily' with qualifier: 'null' with
> timestamp: '4'
> Scan printout =>
> Row: 'myRow', Timestamp: '4', Family: 'myFamily', Qualifier: '', Value:
> 'myValue'
> {color:red}Row: 'myRow', Timestamp: '1', Family: 'myFamily', Qualifier:
> 'myQualifier', Value: 'myValue'{color}
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