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https://issues.apache.org/jira/browse/HADOOP-1707?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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dhruba borthakur reassigned HADOOP-1707:
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Assignee: dhruba borthakur
I plan on removing the staging file altogether. The client will stream data to
the datanodes directly, possibly in chunks of 64K memory buffers. Detail design
to follow.
> 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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