Delayed reroute ” + reason + ” cancelled – How to solve this Elasticsearch error

Opster Team

July-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Check-Up which can resolve issues that cause many errors.

This guide will help you check for common problems that cause the log ” delayed reroute ” + reason + ” cancelled ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: routing and cluster.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up to analyze Elasticsearch configuration and help resolve this error.

Log Context

Log “delayed reroute [” + reason + “] cancelled”classname  is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

synchronized (mutex) {
 if (pendingRerouteListeners == currentListeners) {
 pendingRerouteListeners = null;
 ActionListener.onFailure(currentListeners; new NotMasterException("delayed reroute [" + reason + "] cancelled"));
 // no big deal; the new master will reroute again
 public void onFailure(String source; Exception e) {


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