Denis Chudov created IGNITE-23352:
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Summary: Eliminate races with storage cursors while handling
replica messages
Key: IGNITE-23352
URL: https://issues.apache.org/jira/browse/IGNITE-23352
Project: Ignite
Issue Type: Bug
Reporter: Denis Chudov
*Motivation*
Storage cursors are not thread safe by design. Meanwhile, some code in
PartitionReplicaListener is written without awareness of that. For example,
cursor can be closed by scan close request while it's still in use by another
thread in a handler of retrieve batch request.
This can be solved, for example, by wrapping storage cursors with thread-safe
decorator.
*Definition of done*
There are no possible races related to storage cursors in
PartitionReplicaListener.
*Implementation notes*
It would be nice also to improve
PartitionScanPublisher.PartitionScanSubscription#scanBatch: it should check
#canceled flag on receiving retrieve batch response. Current implementation is
correct but no actions are actually needed afte cancellation so they can be
skipped.
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