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Posted to dev@clerezza.apache.org by "Rupert Westenthaler (JIRA)" <ji...@apache.org> on 2013/03/18 08:32:14 UTC

[jira] [Created] (CLEREZZA-745) ConcurrentModicationException on TDB storage provider (SingleDataset)

Rupert Westenthaler created CLEREZZA-745:
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             Summary: ConcurrentModicationException on TDB storage provider (SingleDataset)
                 Key: CLEREZZA-745
                 URL: https://issues.apache.org/jira/browse/CLEREZZA-745
             Project: Clerezza
          Issue Type: Bug
            Reporter: Rupert Westenthaler


As reported by Minto van der Sluis in [1] the SingleDataset Jena TDB TcProvider can throw .ConcurrentModificationException when iterating over a read protected MGraph and a modification is done to an other graph managed in the same Jena TDB Dataset. This includes creating a new graph in the dataset.

Based on a first analysis this is caused by the Single Dataset Jena TDB TcProvider using per TripleCollections ReadWrite Locks instead of a single ReadWrite Lock for all graphs managed by the same Jena TDB Dataset.



[1] http://mail-archives.apache.org/mod_mbox/clerezza-dev/201303.mbox/%3C5140A9CD.1010208%40xup.nl%3E

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