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https://issues.apache.org/jira/browse/HBASE-18471?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16129883#comment-16129883
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ramkrishna.s.vasudevan commented on HBASE-18471:
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bq.The key say that we should skip all cells which have the same qualifier with
current cell, so the DeleteFamily is skipped.
So my main doubt was that with the first cell that is peeked why is that a
difference. I expected qual0 and empty qualifier both to be lesser than the
qual1. Will check the patch.
> 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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