Fine grained locking in SharedItemStateManager
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Key: JCR-314
URL: http://issues.apache.org/jira/browse/JCR-314
Project: Jackrabbit
Type: Improvement
Components: core
Reporter: Marcel Reutegger
Priority: Minor
The SharedItemStateManager (SISM) currently uses a simple read-write lock to
ensure data consistency. Store operations to the PersistenceManager (PM) are
effectively serialized.
We should think about more sophisticated locking to allow concurrent writes on
the PM.
One possible approach:
If a transaction is currently storing data in a PM a second transaction may
check if the set of changes does not intersect with the first transaction. If
that is the case it can safely store its data in the PM.
This fine grained locking must also be respected when reading from the SISM. A
read request for an item that is currently being stored must be blocked until
the store is finished.
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