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https://issues.apache.org/jira/browse/HDFS-978?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12833622#action_12833622
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dhruba borthakur commented on HDFS-978:
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When a writer requests a new block for a file, the NN should record the new
blockid in the edits log. This persists the mapping from a filename to the list
of its blocks. Now, the writer can write to this block (directly to the
DataNode(s)) while the NN can be restarted without interrupting/invalidating
that write.
> Record every new block allocation of a file into the transaction log.
> ---------------------------------------------------------------------
>
> Key: HDFS-978
> URL: https://issues.apache.org/jira/browse/HDFS-978
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: name-node
> Reporter: dhruba borthakur
>
> HDFS should record every new block allocation (of a file) into its
> transaction logs. In the current code, block allocations are persisted only
> when a file is closed or hflush-ed. This feature will enable HDFS writers to
> survive namenode restarts.
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