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Posted to dev@hbase.apache.org by "stack (JIRA)" <ji...@apache.org> on 2010/02/27 13:06:05 UTC

[jira] Commented: (HBASE-2234) Roll Hlog if any datanode in the write pipeline dies

    [ https://issues.apache.org/jira/browse/HBASE-2234?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12839241#action_12839241 ] 

stack commented on HBASE-2234:
------------------------------

@ Nicolas -- Sweet.  Patch looks good.

> Roll Hlog if any datanode in the write pipeline dies
> ----------------------------------------------------
>
>                 Key: HBASE-2234
>                 URL: https://issues.apache.org/jira/browse/HBASE-2234
>             Project: Hadoop HBase
>          Issue Type: Improvement
>          Components: regionserver
>            Reporter: dhruba borthakur
>            Assignee: stack
>             Fix For: 0.20.4, 0.21.0
>
>         Attachments: HBASE-2234-20.4.patch
>
>
> HDFS does not replicate the last block of a file that is being written to. This means that is datanodes in the write pipeline die, then the data blocks in the transaction log would be experiencing reduced redundancy. It would be good if the region server can detect datanode-death in the write pipeline while writing to the transaction log and if this happens, close the current log an open a new one. This depends on HDFS-826

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