# Is leader sync cluster state to node when new node join cluster?

**URL:** <https://discuss.elastic.co/t/is-leader-sync-cluster-state-to-node-when-new-node-join-cluster/338185>\
**Category:** Elasticsearch\
**Created:** [July 12, 2023, 7:59am UTC](https://discuss.elastic.co/t/is-leader-sync-cluster-state-to-node-when-new-node-join-cluster/338185 "2023-07-12T07:59:41Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![cm\_z](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/cm_z/32/119671_2.png) [@cm\_z](https://discuss.elastic.co/u/cm_z)\
**Post date:** [July 12, 2023, 7:59am UTC](https://discuss.elastic.co/t/is-leader-sync-cluster-state-to-node-when-new-node-join-cluster/338185/1 "2023-07-12T07:59:41Z")

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When a new node or a previously joined node that was later expelled joins a stable cluster, will the leader synchronize the latest cluster status with them? If so, who can tell me where to find this functionality? I have traced the relevant source code but have not found the related feature.

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**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\
**Post date:** [July 12, 2023, 12:29pm UTC](https://discuss.elastic.co/t/is-leader-sync-cluster-state-to-node-when-new-node-join-cluster/338185/3 "2023-07-12T12:29:53Z")

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It's fine to answer on your own thread after 2 or 3 days (not including weekends) if you don't have an answer.

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**Author:** ![DavidTurner](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/davidturner/32/22453_2.png) [@DavidTurner](https://discuss.elastic.co/u/DavidTurner)\
**Post date:** [July 12, 2023, 12:47pm UTC](https://discuss.elastic.co/t/is-leader-sync-cluster-state-to-node-when-new-node-join-cluster/338185/4 "2023-07-12T12:47:51Z")

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The answer is yes: in `o.e.c.c.PublicationTransportHandler.PublicationContext` see how `sendFullClusterState` is called if `sendClusterStateDiff` gets an `IncompatibleClusterStateVersionException`, or if `previousState.nodes().nodeExists(destination) == false`.

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**Author:** ![cm\_z](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/cm_z/32/119671_2.png) [@cm\_z](https://discuss.elastic.co/u/cm_z)\
**Post date:** [July 13, 2023, 2:03am UTC](https://discuss.elastic.co/t/is-leader-sync-cluster-state-to-node-when-new-node-join-cluster/338185/5 "2023-07-13T02:03:39Z")

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Thank you for your response. Is the main triggering entry point org.elasticsearch.cluster.coordination.JoinHelper$LeaderJoinAccumulator handleJoinRequest? I see that a "node-join" cluster publishing task will be triggered here for newly joined nodes, which will publish the latest cluster status (including the newly joined node) to all nodes in the cluster (including all nodes).

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**Author:** ![DavidTurner](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/davidturner/32/22453_2.png) [@DavidTurner](https://discuss.elastic.co/u/DavidTurner)\
**Post date:** [July 13, 2023, 5:54am UTC](https://discuss.elastic.co/t/is-leader-sync-cluster-state-to-node-when-new-node-join-cluster/338185/6 "2023-07-13T05:54:58Z")

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Yes that's right.

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [August 10, 2023, 5:55am UTC](https://discuss.elastic.co/t/is-leader-sync-cluster-state-to-node-when-new-node-join-cluster/338185/7 "2023-08-10T05:55:47Z")

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