Interrupted while waiting for cache sync lock – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.11-8.9

Briefly, this error occurs when Elasticsearch is interrupted while trying to synchronize its cache. This could be due to a slow network, high load on the server, or a sudden shutdown. To resolve this issue, you can try the following: 1) Check and improve your network speed if it’s slow. 2) Reduce the load on your server by optimizing your queries or increasing your server resources. 3) Ensure that Elasticsearch is properly shut down to avoid sudden interruptions. 4) Check for any hardware issues that might be causing the interruption.

This guide will help you check for common problems that cause the log ” interrupted while waiting for cache sync lock ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin, cache.

Log Context

Log “interrupted while waiting for cache sync lock” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                if (acquired == false) {
                    logger.warn("failed to acquire cache sync lock in [{}]; cache might be partially persisted"; cacheSyncStopTimeout);
            } catch (InterruptedException e) {
                logger.warn("interrupted while waiting for cache sync lock"; e);
        } finally {
            try {