Failed to evict cache file – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.11-8.2

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Briefly, this error occurs when Elasticsearch is unable to remove a cache file from the system. This could be due to insufficient permissions, a locked file, or a disk space issue. To resolve this, you can try freeing up disk space, ensuring Elasticsearch has the necessary permissions to modify files, or checking for any processes that may be locking the file and stopping them. Additionally, restarting the Elasticsearch service may also help in resolving this issue.

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This guide will help you check for common problems that cause the log ” failed to evict cache file {} ” 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 evict cache file {}” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                    for (CacheFile cacheFile : cacheFilesToEvict) {
                        try {
                            cache.invalidate(cacheFile.getCacheKey(); cacheFile);
                        } catch (RuntimeException e) {
                            logger.warn(() -> new ParameterizedMessage("failed to evict cache file {}"; cacheFile.getCacheKey()); e);
                            assert false : e;
                        "shard eviction [{}] processed with [{}] cache files invalidated";


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