[jira] [Created] (HADOOP-18636) LocalDirAllocator cannot recover from directory tree deletion during the life of a filesystem client

["Steve Loughran (Jira)" <ji...@apache.org>]

Steve Loughran created HADOOP-18636:
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             Summary: LocalDirAllocator cannot recover from directory tree deletion during the life of a filesystem client
                 Key: HADOOP-18636
                 URL: https://issues.apache.org/jira/browse/HADOOP-18636
             Project: Hadoop Common
          Issue Type: Bug
          Components: fs, fs/azure, fs/s3
    Affects Versions: 3.3.4
            Reporter: Steve Loughran
            Assignee: Steve Loughran


The  s3a and abfs clients use LocalDirAllocator for allocating files in local (temporary) storage for buffering blocks to write, and, for the s3a staging committer, files being staged. 
When initialized (or when the configuration key value is updated) LocalDirAllocator enumerates all directories in the list and calls {{mkdirs()}} to create them.

when you ask actually for a file, it will look for the parent dir, but it calls {{mkdir()}}, rather than {{mkdirs()}}

This means it will recreate a missing parent file but cannot recover from a missing grandparent. If during the life of an application the temp directory is cleaned up, it can result in the failure of the application.

Fix add an "s" to the right place in the production code, plus a new test.




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