Brett Konold created SAMZA-2447:
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             Summary: Checkpoint dir removal should only search in valid store 
dirs
                 Key: SAMZA-2447
                 URL: https://issues.apache.org/jira/browse/SAMZA-2447
             Project: Samza
          Issue Type: Bug
    Affects Versions: 1.3
            Reporter: Brett Konold
            Assignee: Brett Konold


removeOldCheckpoints in TransactionalStateTaskStorageManager currently treats 
every file in the logged store base directory as if it is a directory; not 
always true as there is no guarantee that the base directory has _only_ stores 
in it (there could be other files unrelated to stores depending on how the user 
has configured the directory).

We should only be calling listFiles on files that we know to be directories.

Bonus points if we can search only directories we know to be stores



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