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https://issues.apache.org/jira/browse/HBASE-18471?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16130006#comment-16130006
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Chia-Ping Tsai edited comment on HBASE-18471 at 8/17/17 6:36 AM:
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bq. I really don't know if there is a better way to work on this currently.
The cost of current solution is lower performance if there are many cells which
have empty qualifier. We can't seek to next column directly. That say, we need
to parse all cells one by one. But so far i don't find any better way.
was (Author: chia7712):
bq. I really don't know if there is a better way to work on this currently.
The cost of current solution is lower performance if there are many cells which
have empty qualifier. But so far i don't find any better way.
> 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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