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https://issues.apache.org/jira/browse/IGNITE-19288?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mirza Aliev updated IGNITE-19288:
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Labels: ignite-3 tech-debt (was: ignite-3)
> A race on scheduling data nodes updates if there new nodes and stopped nodes
> in logical topology
> ------------------------------------------------------------------------------------------------
>
> Key: IGNITE-19288
> URL: https://issues.apache.org/jira/browse/IGNITE-19288
> Project: Ignite
> Issue Type: Bug
> Reporter: Sergey Uttsel
> Assignee: Mirza Aliev
> Priority: Major
> Labels: ignite-3, tech-debt
>
> h3. Motivation
> If new logical topology has a new nodes and nodes that left cluster then
> DistributionZoneManager#scheduleTimers() schedules saveDataNodesOnScaleUp and
> saveDataNodesOnScaleDown. These tasks are invoked asynchronously but use the
> same entry in topologyAugmentationMap. So scale up puts entry with some
> revision and then scale down puts entry with the same revision as key.
> The issue is reproduced by
> DistributionZoneAwaitDataNodesTest#testSeveralScaleUpAndSeveralScaleDownThenScaleUpAndScaleDown
> h3. Definition of Done
> * Concurrency bug is fixed.
> * Test is enabled.
> UPD:
> The problem in general could be reproducible in very rare case, namely in the
> scenario, when we have received
> {{LogicalTopologyEventListener#onTopologyLeap}} and there were added and
> removed nodes in this Topology comparing with the topology from metastorage.
> The solution is to change representation of the
> {{DistributionZoneManager.ZoneState#topologyAugmentationMap}}.
> We have
> {code:java}
> private static class Augmentation {
> /** Names of the node. */
> Set<NodeWithAttributes> nodes;
> /** Flag that indicates whether {@code nodeNames} should be added or
> removed. */
> boolean addition;
> Augmentation(Set<NodeWithAttributes> nodes, boolean addition) {
> this.nodes = nodes;
> this.addition = addition;
> }
> }
> {code}
> I suggest to store flag addition in the {{NodeWithAttributes}}, so we could
> have different types of node in terms of added or removed node for a revision
> in the {{DistributionZoneManager.ZoneState#topologyAugmentationMap}}.
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