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From "Jean-Marc Spaggiari (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8521) Cells cannot be overwritten with bulk loaded HFiles
Date Fri, 13 Sep 2013 21:26:53 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13766971#comment-13766971
] 

Jean-Marc Spaggiari commented on HBASE-8521:
--------------------------------------------

[~lhofhansl] any chance to look at that? Want it into 0.94? This patch is already running
on a production cluster.
                
> Cells cannot be overwritten with bulk loaded HFiles
> ---------------------------------------------------
>
>                 Key: HBASE-8521
>                 URL: https://issues.apache.org/jira/browse/HBASE-8521
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.92.1
>            Reporter: Jonathan Natkins
>            Assignee: Jean-Marc Spaggiari
>         Attachments: HBASE-8521.diff, HBASE-8521-v0-0.94.patch, HBASE-8521-v1-0.94.patch,
HBASE-8521-v2-0.94.patch, HBASE-8521-v3-0.94.patch, HBASE-8521-v4-0.94.patch, hfileDirs.tar.gz
>
>
> Let's say you have a pre-built HFile that contains a cell:
> ('rowkey1', 'family1', 'qual1', 1234L, 'value1')
> We bulk load this first HFile. Now, let's create a second HFile that contains a cell
that overwrites the first:
> ('rowkey1', 'family1', 'qual1', 1234L, 'value2')
> That gets bulk loaded into the table, but the value that HBase bubbles up is still 'value1'.
> It seems that there's no way to overwrite a cell for a particular timestamp without an
explicit put operation. This seems to be the case even after minor and major compactions happen.
> My guess is that this is pretty closely related to the sequence number work being done
on the compaction algorithm via HBASE-7842, but I'm not sure if one of would fix the other.

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