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https://issues.apache.org/jira/browse/IGNITE-17666?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vladislav Pyatkov updated IGNITE-17666:
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Description:
h3. Motivation
Read-only transactions start a scan operation and save transaction cursors on
the replica side. The cursors stay on the server until they are closed.
Read-only transactions finish locally and do not notify all replicas of the
transaction.
h3. Definition of done
# Enlist node to RO transaction.
# Prohibit adding operations to the read-only transaction after the transaction
is finished.
# Send the finish transaction request to all enlisted nodes to close cursors.
was:
After cursor was changed in IGNITE-17309, the cancel operation does not close a
cursor opened on a remote node. This proposes to close all resources when the
corresponding transaction commits.
But it is still worth to close a cursor just after all data scanned or when a
client invokes a cancel manually. This has no meaning for implicit
transactions, because the those transactions are closed just after the scan
complete.
The server side logic is already implemented, for close a cursor required to
send a close message through the replication layer. The close message (look at
{_}ScanCloseReplicaRequest{_}) should be sent after a subscriber is received a
last one batch of entries or _Subscription#cancel_ is invoked.
> Scan subscription cancel does not close a server side cursor
> ------------------------------------------------------------
>
> Key: IGNITE-17666
> URL: https://issues.apache.org/jira/browse/IGNITE-17666
> Project: Ignite
> Issue Type: Improvement
> Reporter: Vladislav Pyatkov
> Priority: Major
> Labels: ignite-3
>
> h3. Motivation
> Read-only transactions start a scan operation and save transaction cursors on
> the replica side. The cursors stay on the server until they are closed.
> Read-only transactions finish locally and do not notify all replicas of the
> transaction.
> h3. Definition of done
> # Enlist node to RO transaction.
> # Prohibit adding operations to the read-only transaction after the
> transaction is finished.
> # Send the finish transaction request to all enlisted nodes to close cursors.
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