Semen Boikov created IGNITE-4285:
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Summary: Optimize locks for read-only keys in
optimistic/serializable transactions
Key: IGNITE-4285
URL: https://issues.apache.org/jira/browse/IGNITE-4285
Project: Ignite
Issue Type: Task
Components: cache
Reporter: Semen Boikov
Assignee: Semen Boikov
Fix For: 2,0
Now when optimistic transaction acquires lock for key which is not modified by
any other tx, then TransactionOptimisticException is still possible if read
lock is already held by some other tx with higher tx version.
Following optimziation is possible to avoid TransactionOptimisticException for
mostly read keys: when try to add lock for 'read' key, and in locks queue there
are only others 'read' locks, then lock can be acquired immediately without tx
version check.
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