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From "Manjunath Anand (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-13726) Enforce that FileSystem initializes only a single instance of the requested FileSystem.
Date Sun, 16 Apr 2017 05:22:42 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-13726?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Manjunath Anand updated HADOOP-13726:
-------------------------------------
    Attachment: HADOOP-13726.001.patch

> 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
>            Assignee: Manjunath Anand
>         Attachments: HADOOP-13726.001.patch
>
>
> 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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