Steve Loughran created HADOOP-17906:
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             Summary: AbstractAbfsIntegrationTest.createFilesystemForSASTests() 
leaks FS instances
                 Key: HADOOP-17906
                 URL: https://issues.apache.org/jira/browse/HADOOP-17906
             Project: Hadoop Common
          Issue Type: Sub-task
          Components: fs/azure, test
    Affects Versions: 3.3.1
            Reporter: Steve Loughran
            Assignee: Steve Loughran


I've noticed in MAPREDUCE-7341 that ABFS ITests had a lot of FS instances 
closed in the shutdown hook. 

Tracked down to the fact that  
{{AbstractAbfsIntegrationTest.createFilesystemForSASTests()}} creates a temp FS 
via newInstance(), and doesn't close it...the instance is kept in the cache 
until shutdown.

I'm going to fix it in MAPREDUCE-7341, though it's something minor which could 
be pulled out for backporting



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