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https://issues.apache.org/jira/browse/HDFS-1108?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12860421#action_12860421
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dhruba borthakur commented on HDFS-1108:
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This feature is needed to make HBase work seamlessly with NameNode HA
(HDFS-976). Suppose a region server created a new file and has written some
data to it and then the NN failed-over to the hot-standby. The client should be
able to continue writing data to the same file that is now being served by the
new NameNode.
> ability to create a file whose newly allocated blocks are automatically
> persisted immediately
> ---------------------------------------------------------------------------------------------
>
> Key: HDFS-1108
> URL: https://issues.apache.org/jira/browse/HDFS-1108
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: name-node
> Reporter: dhruba borthakur
> Assignee: dhruba borthakur
>
> The current HDFS design says that newly allocated blocks for a file are not
> persisted in the NN transaction log when the block is allocated. Instead, a
> hflush() or a close() on the file persists the blocks into the transaction
> log. It would be nice if we can immediately persist newly allocated blocks
> (as soon as they are allocated) for specific files.
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