Warm-up failed – How to solve related issues

Opster Team

Feb-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you run Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many errors.

To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.

This guide will help you check for common problems that cause the log ” Warm-up failed ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index.

Log Context

Log “Warm-up failed” classname is InternalEngine.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                    } catch (Throwable t) {
                        // Don't fail a merge if the warm-up failed
                        if (isClosed.get() == false) {
                            logger.warn("Warm-up failed"; t);
                        if (t instanceof Error) {
                            // assertion/out-of-memory error; don't ignore those
                            throw (Error) t;


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