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Posted to common-issues@hadoop.apache.org by "Chris Nauroth (JIRA)" <ji...@apache.org> on 2016/10/17 22:27:00 UTC

[jira] [Created] (HADOOP-13726) Enforce that FileSystem initializes only a single instance of the requested FileSystem.

Chris Nauroth created HADOOP-13726:
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             Summary: 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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