[jira] [Created] (ACCUMULO-1252) Race condition in BulkImport causes ConcurrentModificationException

["William Slacum (JIRA)" <ji...@apache.org>]

William Slacum created ACCUMULO-1252:
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             Summary: Race condition in BulkImport causes ConcurrentModificationException
                 Key: ACCUMULO-1252
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-1252
             Project: Accumulo
          Issue Type: Bug
    Affects Versions: 1.4.2
            Reporter: William Slacum


The LoadFiles class gets a synchronized list of files to import and, while iterating over that list, creates another list of Callable's. If the list of files to load is long enough, it's possible that a bulk import on a previous file in the list could finish and remove itself from the master list before all of the commands to import the rest of the files are created. This causes a ConcurrentModificationException when trying to fetch the next file to load.

I think the concurrent lists support an iterator that will not fail if the underlying list is modified, but if not, I think this can be solved by first creating a list of Callables and then adding them to the thread pool in a separate loop.

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