Handling inbound transport message took ms which is above the warn threshold of ms – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-1.1

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Briefly, this error occurs when OpenSearch takes longer than the set warning threshold to handle an inbound transport message. This could be due to high load, insufficient resources, or network latency. To resolve this, you can optimize your queries, increase your cluster resources, or improve your network connectivity. Additionally, you can adjust the warning threshold if it’s set too low, but this should be done cautiously as it might mask underlying performance issues.

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This guide will help you check for common problems that cause the log ” handling inbound transport message [{}] took [{}ms] which is above the warn threshold of [{}ms] ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: threshold.

Log Context

Log “handling inbound transport message [{}] took [{}ms] which is above the warn threshold of [{}ms]” classname is InboundHandler.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :

        } finally {
            final long took = threadPool.relativeTimeInMillis() - startTime;
            final long logThreshold = slowLogThresholdMs;
            if (logThreshold > 0 && took > logThreshold) {
                logger.warn("handling inbound transport message [{}] took [{}ms] which is above the warn threshold of [{}ms]";
                        message; took; logThreshold);


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