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From "Tsz Wo (Nicholas), SZE (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2246) Shortcut a local client reads to a Datanodes files directly
Date Mon, 07 Nov 2011 19:44:51 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2246?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13145733#comment-13145733
] 

Tsz Wo (Nicholas), SZE commented on HDFS-2246:
----------------------------------------------

Comments on the client side:

- In BlockReaderLocal,
-* In getBlockPathInfo(..), use the local variable proxy in the following.  Otherwise, there
is a race condition that datanodeProxy could be null.
{code}
      pathinfo = datanodeProxy.getBlockLocalPathInfo(blk);
{code}
-* rename datanodeProxy to localhostProxy
-* replace the DatanodeInfo parameter newBlockReader with a port and use localhost:port to
create proxy.
-* when should the proxy be stopped?
-* Why recordAllowedUser but not read the user from conf?


                
> Shortcut a local client reads to a Datanodes files directly
> -----------------------------------------------------------
>
>                 Key: HDFS-2246
>                 URL: https://issues.apache.org/jira/browse/HDFS-2246
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Sanjay Radia
>         Attachments: 0001-HDFS-347.-Local-reads.patch, HDFS-2246-branch-0.20-security-205.patch,
HDFS-2246-branch-0.20-security-205.patch, HDFS-2246-branch-0.20-security.patch, HDFS-2246.20s.1.patch,
HDFS-2246.20s.2.txt, HDFS-2246.20s.3.txt, HDFS-2246.20s.4.txt, HDFS-2246.20s.patch, localReadShortcut20-security.2patch
>
>


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