Vladislav Pyatkov created IGNITE-21290:
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Summary: Scan cursors do not close after being fully read in
transactions
Key: IGNITE-21290
URL: https://issues.apache.org/jira/browse/IGNITE-21290
Project: Ignite
Issue Type: Bug
Reporter: Vladislav Pyatkov
h3. Motivation
Open cursors require extra memory on the server side, so they should be closed
as soon as they are no longer used. It is easy to understand on the coursor
owner server when the coursor returns false for the hasNext invocation.
Despite the fact that all acquired transaction resources should be released
after the transaction finalizes, it would be better to close usles coursorse
faseter. Moreover, the agreement is fit for all types of transactions: RO, RW,
and inplicit.
h3. Implementation notes
A course can be closed after the _isUpperBoundAchieved_ return is false.
Cover all variant scan operations in tests.
Get rid of the nonsensical message: _ScanCloseReplicaRequest_
h3. Definition of done
A cursor is closed on the server side when the client retrieves all data from
it through any type of scan operation.
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