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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6640) FileSystem.get() does RPC retries within a static synchronized block
Date Mon, 29 Mar 2010 21:40:27 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6640?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12851116#action_12851116
] 

Hairong Kuang commented on HADOOP-6640:
---------------------------------------

This solution will add cost to each rpc call although the cost is insignificant. Base on the
discussion so far, will you consider solution 1 (Sanjay's proposal)? From my point of view,
solution 1 is quite straightforward and the concern you have seems very unlikely to happen.

> 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
>         Environment: all
>            Reporter: Alejandro Abdelnur
>            Assignee: Hairong Kuang
>            Priority: Critical
>
> 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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