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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-962) Make DFSOutputStream MAX_PACKETS configurable
Date Tue, 30 Aug 2011 07:26:38 GMT

    [ https://issues.apache.org/jira/browse/HDFS-962?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13093504#comment-13093504
] 

Tsz Wo (Nicholas), SZE commented on HDFS-962:
---------------------------------------------

Hi Justin,

Thanks for working on this.  Some comments on the patch:

- change dfsMaxPackets to private and non-static.

- define constants for dfs.max.packets in DFSConfigKeys

> Make DFSOutputStream MAX_PACKETS configurable
> ---------------------------------------------
>
>                 Key: HDFS-962
>                 URL: https://issues.apache.org/jira/browse/HDFS-962
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs client
>    Affects Versions: 0.22.0
>            Reporter: Todd Lipcon
>            Assignee: Justin Joseph
>            Priority: Minor
>         Attachments: HDFS-962.patch
>
>
> HDFS-959 suggests that the MAX_PACKETS variable (which determines how many outstanding
data packets the DFSOutputStream will permit) may have an impact on performance. If so, we
should make it configurable to trade off between memory and performance. I think it ought
to be a secret/undocumented config for now - this will make it easier to benchmark without
confusing users.

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