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From "Eric Newton (JIRA)" <>
Subject [jira] [Resolved] (ACCUMULO-1252) Race condition in BulkImport causes ConcurrentModificationException
Date Thu, 05 Sep 2013 13:03:51 GMT


Eric Newton resolved ACCUMULO-1252.

       Resolution: Fixed
    Fix Version/s: 1.4.4
         Assignee: Eric Newton
> Race condition in BulkImport causes ConcurrentModificationException
> -------------------------------------------------------------------
>                 Key: ACCUMULO-1252
>                 URL:
>             Project: Accumulo
>          Issue Type: Bug
>    Affects Versions: 1.4.2
>            Reporter: William Slacum
>            Assignee: Eric Newton
>             Fix For: 1.4.4
> 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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