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From "William Slacum (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-1252) Race condition in BulkImport causes ConcurrentModificationException
Date Mon, 08 Apr 2013 17:03:16 GMT
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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