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https://issues.apache.org/jira/browse/HBASE-2234?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12839522#action_12839522
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Nicolas Spiegelberg commented on HBASE-2234:
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@ryan I could go a couple ways with rebindWriterFunc(). I either need the
"this" pointer to set "this.hdfs_out", in which case I don't need to explicitly
pass in any params since it's always "this.writer". Or I could return an
OutputStream and make this function static. I'm new to Java from an embedded
C++ background; but to me it look like this is 6 of one, half-dozen of the
other. I have a couple internal comments about this diff I may need to apply
as well, so I'll roll that change into my next diff.
> 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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