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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 Sat, 09 Jun 2012 20:04:43 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-v5.patch

Also adds a subclass of TestPipelinesFailover running all tests with PARALLEL_WRITES.

FileSystem.append itself does not support parallel writes (as of this patch).

I am generally not quite clear what the difference between FileSystem.append and FileSystem.create(...,
CreateFlag.APPEND, ...) is supposed to be.

                
> 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-v5.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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