Rupert Westenthaler created STANBOL-1424:
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Summary: The commons.opennlp module can load the same model twice
in parallel
Key: STANBOL-1424
URL: https://issues.apache.org/jira/browse/STANBOL-1424
Project: Stanbol
Issue Type: Bug
Affects Versions: 0.12.0
Reporter: Rupert Westenthaler
Assignee: Rupert Westenthaler
Priority: Minor
Fix For: 1.0.0, 0.12.1
The commons.opennlp model allows to load models by their names via the
DataFileProvider infrastructure. Loaded models are cached in memory.
If two components do request the same model in a short time. Especially when
the 2md request for a model comes before the first was completed the same model
is loaded twice in parallel. This will result that two instances of the model
are loaded.
While the 2nd request will override the cached model of the first the first
component requesting the model might still hold a reference. In this case two
instances of the model are holded in-memory.
To solve those situations the OpenNLP service needs to use lock while loading
models.
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