Waiting for reaper to exit normally – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch is trying to shut down a process, but it’s taking longer than expected. The “reaper” is a mechanism that cleans up resources after a process has finished. This could be due to a heavy load, slow network, or a bug in the system. To resolve this issue, you can try to identify and reduce any heavy workloads, improve network speed, or update OpenSearch to the latest version to fix any potential bugs. If the problem persists, consider increasing the timeout settings or consult with a technical expert.

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This guide will help you check for common problems that cause the log ” Waiting for reaper to exit normally ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: .

Log Context

Log “Waiting for reaper to exit normally” classname is ReaperService.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :

    void shutdown() {
        if (reaperProcess != null) {
            try {
                logger.info("Waiting for reaper to exit normally");
                if (reaperProcess.waitFor() != 0) {
                    throw new GradleException("Reaper process failed. Check log at " + inputDir.resolve("error.log") + " for details");
            } catch (Exception e) {
                throw new RuntimeException(e);


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