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https://issues.apache.org/jira/browse/HADOOP-1707?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12533903
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dhruba borthakur commented on HADOOP-1707:
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The local disk cache implementation is similar to creating four replicas of the
block and then deleting the excess replica when the block is done. This reduces
overall cluster throughput and I would like to analyze ways of getting rid of
it.
I agree that I should change the name-description of this JIRA. Will do.
> DFS client can allow user to write data to the next block while uploading
> previous block to HDFS
> ------------------------------------------------------------------------------------------------
>
> Key: HADOOP-1707
> URL: https://issues.apache.org/jira/browse/HADOOP-1707
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Reporter: dhruba borthakur
> Assignee: dhruba borthakur
>
> The DFS client currently uses a staging file on local disk to cache all
> user-writes to a file. When the staging file accumulates 1 block worth of
> data, its contents are flushed to a HDFS datanode. These operations occur
> sequentially.
> A simple optimization of allowing the user to write to another staging file
> while simultaneously uploading the contents of the first staging file to HDFS
> will improve file-upload performance.
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