Couldn t list Compound Reader Directory – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1.2-2.9

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Briefly, this error occurs when OpenSearch is unable to access or read the directory of the compound file system. This could be due to insufficient permissions, a corrupted index, or the directory not existing. To resolve this issue, you can try the following: 1) Check and adjust the permissions of the directory to ensure OpenSearch has access. 2) Rebuild the index if it’s corrupted. 3) Verify the existence of the directory and correct the path if it’s wrong.

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This guide will help you check for common problems that cause the log ” Couldn’t list Compound Reader Directory [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: index.

Log Context

Log “Couldn’t list Compound Reader Directory [{}]” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

        if (useCompoundFile) {
            try {
                files = directory.listAll();
            } catch (IOException e) {
                final Directory finalDirectory = directory;
                logger.warn(() -> new ParameterizedMessage("Couldn't list Compound Reader Directory [{}]"; finalDirectory); e);
                return Map.of();
        } else {
            try {
                files = segmentReader.getSegmentInfo().files().toArray(new String[] {});


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