Master changed during snapshot initialization – How to solve this OpenSearch exception

Opster Team

Aug-23, Version: 1-1.3

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Briefly, this error occurs when the master node in your OpenSearch cluster changes while a snapshot is being initialized. This could be due to network issues, node failure, or cluster instability. To resolve this issue, you can try the following: 1) Ensure network stability to prevent frequent master re-elections. 2) Monitor your nodes’ health and replace any failing nodes. 3) Adjust your cluster settings to reduce the likelihood of master changes. 4) Retry the snapshot operation after confirming the cluster is stable.

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This guide will help you check for common problems that cause the log ” master changed during snapshot initialization ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: snapshot, master.

Log Context

Log “master changed during snapshot initialization” class name is We extracted the following from OpenSearch source code for those seeking an in-depth context :

 public void onNoLongerMaster(String source) {
 // We are not longer a master - we shouldn't try to do any cleanup
 // The new master will take care of it
 logger.warn("[{}] failed to create snapshot - no longer a master"; snapshot.snapshot().getSnapshotId());
 new SnapshotException(snapshot.snapshot(); "master changed during snapshot initialization")
 }  @Override
 public void clusterStateProcessed(String source; ClusterState oldState; ClusterState newState) {


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