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https://issues.apache.org/jira/browse/HDFS-1783?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13283170#comment-13283170
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dhruba borthakur commented on HDFS-1783:
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Hi Lars, the code is in
https://github.com/facebook/hadoop-20/blob/master/src/hdfs/org/apache/hadoop/hdfs/DFSClient.java
The code is quite simple to change the HDFS client: look at the class
MultiDataOutputStream
> Ability for HDFS client to write replicas in parallel
> -----------------------------------------------------
>
> Key: HDFS-1783
> URL: https://issues.apache.org/jira/browse/HDFS-1783
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs client
> Reporter: dhruba borthakur
> Assignee: dhruba borthakur
>
> The current implementation of HDFS pipelines the writes to the three
> replicas. This introduces some latency for realtime latency sensitive
> applications. An alternate implementation that allows the client to write all
> replicas in parallel gives much better response times to these applications.
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