Failed to retrieve shard size for – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.1-8.2

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Briefly, this error occurs when Elasticsearch is unable to fetch the size of a shard, possibly due to a network issue, a node failure, or a misconfiguration. To resolve this, you can check the network connectivity between nodes, ensure all nodes are running properly, and verify the cluster’s configuration. If the issue persists, consider reindexing the data or increasing the timeout value.

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This guide will help you check for common problems that cause the log ” failed to retrieve shard size for {} ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: shard.

Log Context

Log “failed to retrieve shard size for {}” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :


        public void onFailure(Exception e) {
            logger.warn(() -> new ParameterizedMessage("failed to retrieve shard size for {}"; snapshotShard); e);
            boolean failed = false;
            synchronized (mutex) {
                if (isMaster) {
                    failed = failedSnapshotShards.add(snapshotShard);
                    assert failed : "snapshot shard size already failed for " + snapshotShard;


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