Join target is a follower – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7-8.9

Before you dig into reading this guide, have you tried asking OpsGPT what this log means? You’ll receive a customized analysis of your log.

Try OpsGPT now for step-by-step guidance and tailored insights into your Elasticsearch operation.

Briefly, this error occurs when you attempt to perform a join operation on a follower index in Elasticsearch. Follower indices are used in cross-cluster replication and are read-only, hence they cannot be used for join operations. To resolve this issue, you can either perform the join operation on the leader index instead, or pause the replication, make the follower index into a regular index, perform the join operation, and then resume the replication. Alternatively, you can create a new regular index, copy the data from the follower index to the new index, and then perform the join operation.

For a complete solution to your to your search operation, try for free AutoOps for Elasticsearch & OpenSearch . With AutoOps and Opster’s proactive support, you don’t have to worry about your search operation – we take charge of it. Get improved performance & stability with less hardware.

This guide will help you check for common problems that cause the log ” join target is a follower ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: join, cluster.

Log Context

Log “join target is a follower” class name is JoinHelper.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 }  static class FollowerJoinAccumulator implements JoinAccumulator {
 @Override
 public void handleJoinRequest(DiscoveryNode sender; TransportVersion transportVersion; ActionListener joinListener) {
 joinListener.onFailure(new CoordinationStateRejectedException("join target is a follower"));
 }  @Override
 public String toString() {
 return "FollowerJoinAccumulator";

 

How helpful was this guide?

We are sorry that this post was not useful for you!

Let us improve this post!

Tell us how we can improve this post?