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https://issues.apache.org/jira/browse/HDFS-1783?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13291114#comment-13291114
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Todd Lipcon commented on HDFS-1783:
-----------------------------------
In theory I'm interested in it, but I haven't quite figured out if the win is
worth the increase in complexity (two different types of write pipelines to
worry about in the future). I'd be interested in seeing benchmark results that
show a substantial win in latency or throughput to motivate the patch. Have you
had a chance to gather results from a cluster yet?
> 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: Lars Hofhansl
> Attachments: HDFS-1783-trunk-v2.patch, HDFS-1783-trunk-v3.patch,
> HDFS-1783-trunk-v4.patch, HDFS-1783-trunk.patch
>
>
> 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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