Lou DeGenaro created UIMA-3657:
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Summary: DUCC Orchestrator (OR) improved synchronization tracking
Key: UIMA-3657
URL: https://issues.apache.org/jira/browse/UIMA-3657
Project: UIMA
Issue Type: Improvement
Components: DUCC
Affects Versions: 1.0-Ducc
Reporter: Lou DeGenaro
Assignee: Lou DeGenaro
The orchestrator currently records to its log some limited and incomplete
information about synchronization. This improvement:
1. Instruments all WorkMap synchronizations in the OR
2. Accounts for time blocked and time held
3. Records all new requests for synchronization when current holder exceeds 10
seconds
4. Records all pending requests when current holder releases having held
synchronization for > 10 seconds
This is to address the situation, for example, where OR is running albeit
slowly. Newly added log messages will hopefully shed light on where the
bottlenecks may be.
One theory is that a normally fast resource, such as the filesystem, becomes
very slow and bogs down OR while its trying to write its checkpoint dataset.
In this case, we'd expect to see the synchronization lock held for a long time
by the OR's checkpoint module.
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