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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13726) Enforce that FileSystem initializes only a single instance of the requested FileSystem.
Date Tue, 18 Oct 2016 09:03:59 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13726?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15584932#comment-15584932
] 

Steve Loughran commented on HADOOP-13726:
-----------------------------------------

Guava has some caching stuff too; it may be simpler to reuse than than repurpose some of our
own code

> Enforce that FileSystem initializes only a single instance of the requested FileSystem.
> ---------------------------------------------------------------------------------------
>
>                 Key: HADOOP-13726
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13726
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs
>            Reporter: Chris Nauroth
>
> The {{FileSystem}} cache is intended to guarantee reuse of instances by multiple call
sites or multiple threads.  The current implementation does provide this guarantee, but there
is a brief race condition window during which multiple threads could perform redundant initialization.
 If the file system implementation has expensive initialization logic, then this is wasteful.
 This issue proposes to eliminate that race condition and guarantee initialization of only
a single instance.



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