Snapshot blob cache maintenance task failed for cluster state update event source – 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 fails to perform a maintenance task on the snapshot blob cache due to an issue with the cluster state update event source. This could be due to network issues, insufficient permissions, or a problem with the underlying storage system. To resolve this, you can try restarting the Elasticsearch cluster, checking the network connectivity, ensuring the user has the correct permissions, or verifying the health of the storage system. If the problem persists, consider increasing the logging level to get more detailed error messages.

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This guide will help you check for common problems that cause the log ” snapshot blob cache maintenance task failed for cluster state update [” + event.source() + “] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin, task, cache, snapshot, cluster.

Log Context

Log “snapshot blob cache maintenance task failed for cluster state update [” + event.source() + “]” classname is BlobStoreCacheMaintenanceService.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

            }));
        }

        @Override
        public void onFailure(Exception e) {
            logger.warn(() -> "snapshot blob cache maintenance task failed for cluster state update [" + event.source() + "]"; e);
        }
    }

    /**
     * A maintenance task that periodically cleans up unused cache entries from the blob store cache index.

 

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