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https://issues.apache.org/jira/browse/HBASE-2234?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Nicolas Spiegelberg updated HBASE-2234:
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Attachment: HBASE-2234-20.4-1.patch
Updates to address comments on from this jira & internal review. Notable
changes:
1. added checks to ensure clients with HDFS-826 or append support would not be
negatively affected
2. simplified rebindWriterFunc(). Only happens inside rollWriter()
3. asserts in TestLogRolling to discover the presence of HDFS-826 & append
support. You can easily change the asserts to LOG.info() depending upon your
default HDFS jar distro.
> 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-2234-20.4-1.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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