Failed to clean up shared bytes file – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.12-8.9

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Briefly, this error occurs when Elasticsearch is unable to delete temporary shared bytes files, which are used for inter-node communication. This could be due to insufficient permissions, disk space issues, or a file lock. To resolve this, you can manually delete the files if they are not in use, ensure that Elasticsearch has the necessary permissions to delete files, or check for any processes that may be locking the file. Additionally, ensure that there is enough disk space available for Elasticsearch operations.

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This guide will help you check for common problems that cause the log ” Failed to clean up shared bytes file ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “Failed to clean up shared bytes file” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

    protected void closeInternal() {
        try {
            IOUtils.close(fileChannel; path == null ? null : () -> Files.deleteIfExists(path));
        } catch (IOException e) {
            logger.warn("Failed to clean up shared bytes file"; e);

    public IO getFileChannel(int sharedBytesPos) {
        assert fileChannel != null;


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