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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12065) Import tool is not restoring multiple DeleteFamily markers of a row
Date Wed, 24 Sep 2014 04:55:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12065?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14145890#comment-14145890
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Lars Hofhansl commented on HBASE-12065:
---------------------------------------

Delete family markers sort before any KVs for the row in question. That is so that we can
find all KVs targeted by a delete marker during a forward only scan.
If we have two delete markers for the *same* family, it is correct to only keep the newest
one.

>  Import tool is not restoring multiple DeleteFamily markers of a row
> --------------------------------------------------------------------
>
>                 Key: HBASE-12065
>                 URL: https://issues.apache.org/jira/browse/HBASE-12065
>             Project: HBase
>          Issue Type: Bug
>          Components: util
>    Affects Versions: 0.98.2
>            Reporter: Maddineni Sukumar
>            Assignee: Maddineni Sukumar
>            Priority: Minor
>
> When a row has more than one DeleteFamily markers, Import tool is not restoring all DeleteFamily
markers. 
> Scenario: Insert entries into hbase in below order
> Put Row1 with Value-A
> Delete Row1 with DeleteFamily Marker
> Put Row1 with Value-B
> Delete Row1 with DeleteFamily Marker
> Using Export tool export this data and Import it into another table, you will see below
entries
> Delete Row1 with DeleteFamily Marker
> Put Row1 with Value-B
> Put Row1 with Value-A
> One DeleteFamily marker is missing here... In Import tool, Importer.writeResult() method
we are batching all deletes into a single Delete request and pushing into hbase. Here we are
pushing only one delete family marker into hbase table.
> I tried same with normal HTable.delete command also. 
> If you pass multiple DeleteFamily markers of a row in a single Delete request to hbase
then table is maintaining only one. 
> If that is the expected  behavior of hbase then we should change logic in Import tool
to push DeleteFamily markers individually one by one.



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