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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6640) FileSystem.get() does RPC retries within a static synchronized block
Date Wed, 31 Mar 2010 23:22:27 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6640?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12852167#action_12852167
] 

Tsz Wo (Nicholas), SZE commented on HADOOP-6640:
------------------------------------------------

> ... If you insist on using solution 2, I am not against it.

For this issue, I am not insist on solution 2 but I do think that solution 2 has its value.
 We should implement it when we have bandwidth.

> FileSystem.get() does RPC retries within a static synchronized block
> --------------------------------------------------------------------
>
>                 Key: HADOOP-6640
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6640
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs
>         Environment: all
>            Reporter: Alejandro Abdelnur
>            Assignee: Hairong Kuang
>            Priority: Critical
>         Attachments: getFS.patch
>
>
> If using FileSystem.get() in a multithreaded environment, and one get() locks because
the NN URI is too slow or not responding and retries are in progress, all other get() (for
the diffferent users, NN) are blocked.
> the synchronized block in in the static instance of Cache inner class.

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