Timeout waiting for request – How to solve this OpenSearch exception

Opster Team

Aug-23, Version: 1-1.1

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Briefly, this error occurs when OpenSearch takes too long to respond to a request, exceeding the set timeout limit. This could be due to heavy load, inefficient queries, or network issues. To resolve this, you can increase the timeout limit, optimize your queries for efficiency, or check your network for any issues. Additionally, consider scaling your OpenSearch cluster if it’s consistently under heavy load.

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This guide will help you check for common problems that cause the log ” Timeout waiting for [{}]; request: {} ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: .

Log Context

Log “Timeout waiting for [{}]; request: {}” class name is TransportInstanceSingleOperationAction.java. We extracted the following from OpenSearch source code for those seeking an in-depth context :

 if (observer.isTimedOut()) {
 // we running as a last attempt after a timeout has happened. don't retry
 Exception listenFailure = failure;
 if (listenFailure == null) {
 if (shardIt == null) {
 listenFailure = new UnavailableShardsException(request.concreteIndex(); -1; "Timeout waiting for [{}]; request: {}";
 request.timeout(); actionName);
 } else {
 listenFailure = new UnavailableShardsException(shardIt.shardId();
 "[{}] shardIt; [{}] active : Timeout waiting for [{}]; request: {}"; shardIt.size(); shardIt.sizeActive();
 request.timeout(); actionName);


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