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Posted to notifications@accumulo.apache.org by "Eric Newton (JIRA)" <ji...@apache.org> on 2013/04/08 19:29:15 UTC

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

    [ https://issues.apache.org/jira/browse/ACCUMULO-1252?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13625568#comment-13625568 ] 

Eric Newton commented on ACCUMULO-1252:
---------------------------------------

This happened when multiple import requests were being processed for over 700 files.
                
> 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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