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Briefly, this error occurs when the OpenSearch system attempts to initiate a reaper process but encounters an issue with the string joining operation. This could be due to incorrect syntax, null values, or incompatible data types. To resolve this, you should first check the syntax of the String.join operation to ensure it’s correct. Next, verify the values being joined are not null and are of a compatible data type. If the issue persists, consider debugging the code to identify the exact point of failure.
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This guide will help you check for common problems that cause the log ” Launching reaper: ” + String.join(” ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: .
Log “Launching reaper: ” + String.join(” ” classname is ReaperService.java.
We extracted the following from OpenSearch 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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