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https://issues.apache.org/jira/browse/HADOOP-13726?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15970660#comment-15970660
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Manjunath Anand commented on HADOOP-13726:
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Thanks [~ste...@apache.org] for your inputs. What you proposed is a good idea.
I am thinking we may need to make sure that the unitialized FS object is
checked in all methods which exposes the FS object from cache which may need
extra coding in other methods. Please correct me if I am wrong on this. I will
wait for yours and [~cnauroth] comments to proceed further and come up with new
patch as the case be.
> 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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