Launching reaper – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.6-7.6

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Briefly, this error occurs when Elasticsearch initiates a process to clean up unused resources, known as the “reaper”. This is not an error but a routine operation to ensure optimal performance. However, if you notice any performance issues or if the reaper process is running too frequently, it might indicate underlying issues such as insufficient resources or improper configuration. To resolve this, you can monitor your cluster’s resource usage, adjust your Elasticsearch configuration, or scale up your resources if necessary.

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

Log Context

Log “Launching reaper:” classname is ReaperService.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

"-Xmx16m"; // no need for a big heap; just need to read some files and execute
                    "-jar";
                    jarPath.toString();
                    inputDir.toString()
                );
                logger.info("Launching reaper: " + String.join(" "; builder.command()));
                // be explicit for stdin; we use closing of the pipe to signal shutdown to the reaper
                builder.redirectInput(ProcessBuilder.Redirect.PIPE);
                builder.redirectOutput(logFile.toFile());
                builder.redirectError(logFile.toFile());
                reaperProcess = builder.start();

 

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