Failed to close ReaderManager – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch fails to close the ReaderManager, which is responsible for managing open IndexReaders. This could be due to a bug, a resource leak, or an issue with the underlying file system. To resolve this issue, you can try restarting the OpenSearch service to free up any locked resources. If the problem persists, consider checking for any updates or patches that might fix known bugs. Additionally, ensure that your file system is functioning correctly and has sufficient resources. Lastly, check your OpenSearch logs for any additional information about the error.

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This guide will help you check for common problems that cause the log ” Failed to close ReaderManager ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: index.

Log Context

Log “Failed to close ReaderManager” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

                try {
                    IOUtils.close(externalReaderManager; internalReaderManager);
                } catch (Exception e) {
                    logger.warn("Failed to close ReaderManager"; e);
                try {
                } catch (Exception e) {
                    logger.warn("Failed to close translog"; e);


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