Andrus Adamchik created CAY-2123:
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Summary: Synchronizing cache updates with external trasnaction
boundaries
Key: CAY-2123
URL: https://issues.apache.org/jira/browse/CAY-2123
Project: Cayenne
Issue Type: Bug
Affects Versions: 4.0.M3, 3.1.1
Reporter: Andrus Adamchik
Assignee: Andrus Adamchik
Some of the steps in the commit sequence should work differently when Cayenne
is operating under external transactions. One scenario is shared cache
synchronization. E.g.:
1. Thread A commits ObjectContext. Under external transaction this results in a
flush operation, pending tx commit/rollback
2. Thread B runs an operation that hits the cache (e.g. reads a to-one
relationship). It gets values committed under thread A
3. Thread A rolls back its transaction... Invalid value gets stuck in shared
cache. Now all threads will see it.
This behavior results in dirty reads regardless of the actual transaction
isolation level. Looks like we'll need to make our cache transaction-aware and
provide an API for committing cache state on external transaction events. The
initial implementation for this API may be targeting Spring transactions.
Things may become even more complicated when multiple overlapping threads
change the same object. "snapshot version changed" message in the logs is a
symptom of this inconsistency.
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