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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-842) change the open method in ClientProtocol to take an additional argument: clientMachine
Date Fri, 05 Jan 2007 01:12:27 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-842?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12462377
] 

Hairong Kuang commented on HADOOP-842:
--------------------------------------

Thanks Doug for your suggestion.

I realized that passing the datanode port # as a part of clientMachine is not a good idea.
When a datanode starts up, it tries to use the port from conf.get("dfs.datanode.port"). But
if there is a failure, it tries a different port#. So it is not right that a dfs client simply
assumes that the local datanode has the port# of conf.get("dfs.datanode.port").

I'd like to change the open method so that parameter clientMachine contains only hostName
but no port#. At the name node side, the datanode list will be searched based on hostname
not hostname:port#.

> change the open method in ClientProtocol to take an additional argument: clientMachine
> --------------------------------------------------------------------------------------
>
>                 Key: HADOOP-842
>                 URL: https://issues.apache.org/jira/browse/HADOOP-842
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: dfs
>    Affects Versions: 0.9.2
>            Reporter: Hairong Kuang
>         Assigned To: Hairong Kuang
>             Fix For: 0.10.0
>
>         Attachments: open.patch
>
>
> The open method returns a list of blocks that belong to a file and, for each block, a
list of datanodes that contain the block.To improve reading efficiency, I'd like to return
the list of datanodes in the order of its distance to the client machine. So I suggest that
we make the open method to take an additional argument clientMachine which is in the format
of hostname:port#.

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