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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-1783) Ability for HDFS client to write replicas in parallel
Date Fri, 01 Jun 2012 21:33:24 GMT

     [ https://issues.apache.org/jira/browse/HDFS-1783?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Lars Hofhansl updated HDFS-1783:
--------------------------------

    Attachment: HDFS-1783-trunk-v3.patch

Added a new DataNodeMetric: ChunksVerified.
Since with parallel writes each DN has to verify each chunk rather than just the last DN in
a pipeline, this is an interesting metric to capture.
Also added a simple test based on that metric.
                
> 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.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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