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From "Tsz Wo (Nicholas), SZE (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-962) Make DFSOutputStream MAX_PACKETS configurable
Date Mon, 02 Jan 2012 08:12:30 GMT

    [ https://issues.apache.org/jira/browse/HDFS-962?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13178321#comment-13178321
] 

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

@Harsh, the test should verify if the patch is working.

It makes sense to check different values of packets and their impact but it can be done separately.
 You made a good point. 
                
> 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-962.1.patch, 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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