hbase-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8521) Cells cannot be overwritten with bulk loaded HFiles
Date Wed, 15 May 2013 16:31:19 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13658512#comment-13658512
] 

Ted Yu commented on HBASE-8521:
-------------------------------

Looks like the following new method needs to be added to HRegionInterface (note the 3rd parameter):
{code}
  public boolean bulkLoadHFiles(List<Pair<byte[], String>> familyPaths, byte[]
regionName, assignSeqIds)
  throws IOException;
{code}
This means that if some region servers use 0.94.7 jars, the call in LoadIncrementalHFiles
utilizing the new method would fail.

Fallback to existing, two argument, method can be used in above scenario.

I want to other people's opinion on the compatibility issue.
                
> 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: Ted Yu
>         Attachments: HBASE-8521.diff, 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.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira

Mime
View raw message