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Mirza Aliev updated IGNITE-19955: --------------------------------- Epic Link: IGNITE-20611 (was: IGNITE-20166) > 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 > 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 -- This message was sent by Atlassian Jira (v8.20.10#820010)