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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2234) Roll Hlog if any datanode in the write pipeline dies
Date Sat, 06 Mar 2010 05:37:27 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2234?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12842193#action_12842193
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stack commented on HBASE-2234:
------------------------------

@Nicolas And i think then this patch fine as is unless you want to add more comments (I can
make my small suggested changes above on commit).

> 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: Nicolas Spiegelberg
>            Priority: Blocker
>             Fix For: 0.20.4, 0.21.0
>
>         Attachments: HBASE-2234-20.4-1.patch, 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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