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

Opster Team

Aug-23, Version: 8.3-8.9

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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 to manually delete the file if it’s not in use, check and adjust the file permissions, or free up some disk space. Additionally, ensure that no process is currently using the file, as this could prevent it from being evicted.

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This guide will help you check for common problems that cause the log ” failed to evict cache file %s ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin, cache.

Log Context

Log “failed to evict cache file %s” 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(() -> format("failed to evict cache file %s"; cacheFile.getCacheKey()); e);
                            assert false : e;
                        "shard eviction [{}] processed with [{}] cache files invalidated";


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