Failed to pre-allocate cache file using native methods – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.12-8.2

Briefly, this error occurs when Elasticsearch is unable to pre-allocate space for a cache file due to insufficient disk space or permission issues. To resolve this, you can free up some disk space or check the permissions of the directory where Elasticsearch is trying to create the cache file. If the issue persists, you may need to check the Elasticsearch configuration for any misconfigurations.

This guide will help you check for common problems that cause the log ” failed to pre-allocate cache file [{}] using native methods ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: cache, plugin.

Log Context

Log “failed to pre-allocate cache file [{}] using native methods” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                } catch (final Exception e) {
                    logger.warn(new ParameterizedMessage("failed to pre-allocate cache file [{}] using native methods"; cacheFile); e);
            // even if allocation was successful above; verify again here
            try (RandomAccessFile raf = new RandomAccessFile(cacheFile.toFile(); "rw")) {
                if (raf.length() != fileSize) {


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