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https://issues.apache.org/jira/browse/IGNITE-19955?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mirza Aliev reassigned IGNITE-19955:
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Assignee: Mirza Aliev
> Fix create zone on restart rewrites existing data nodes because of trigger
> key inconsistnecy
> --------------------------------------------------------------------------------------------
>
> Key: IGNITE-19955
> URL: https://issues.apache.org/jira/browse/IGNITE-19955
> Project: Ignite
> Issue Type: Bug
> Reporter: Mirza Aliev
> Assignee: Mirza Aliev
> Priority: Major
> Labels: ignite-3
>
> Currently we have the logic for initialisation of newly created zone that it
> writes keys
> {noformat}
> zoneDataNodesKey(zoneId), zoneScaleUpChangeTriggerKey(zoneId),
> zoneScaleDownChangeTriggerKey(zoneId), zonesChangeTriggerKey(zoneId)
> {noformat}
> to metastorage, and condition is
> {noformat}
> static CompoundCondition triggerKeyConditionForZonesChanges(long
> revision, int zoneId) {
> return or(
> notExists(zonesChangeTriggerKey(zoneId)),
>
> value(zonesChangeTriggerKey(zoneId)).lt(ByteUtils.longToBytes(revision))
> );
> {noformat}
> Recovery process implies that the create zone event will be processed again,
> but with the higher revision, so data nodes will be rewritten.
> We need to handle this situation, so data nodes will be consistent after
> restart.
> Possible solution is to change condition to
> {noformat}
> static SimpleCondition triggerKeyConditionForZonesCreation(long revision,
> int zoneId) {
> return notExists(zonesChangeTriggerKey(zoneId));
> }
> static SimpleCondition triggerKeyConditionForZonesDelete(int zoneId) {
> return exists(zonesChangeTriggerKey(zoneId));
> }
> {noformat}
>
> so we could not rely on revision and check only existence of the key, when we
> create or remove zone. The problem in this solution is that reordering of the
> create and remove on some node could lead to not consistent state for zones
> key in metastorage
> *UPD*:
> This problem will be resolves once we implement
> https://issues.apache.org/jira/browse/IGNITE-20561
> In this ticket we need to unmute all tickets that were muted by this ticket
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