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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