Failed to invoke shard touring changed callback – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-1.1

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Briefly, this error occurs when OpenSearch fails to invoke a callback function after a shard change event. This could be due to a network issue, a problem with the shard itself, or a bug in the callback function. To resolve this issue, you can try the following: 1) Check the network connectivity and ensure that all nodes are reachable. 2) Inspect the shard for any inconsistencies or corruption and repair if necessary. 3) Review the callback function code for any errors and fix them. 4) Restart the OpenSearch service to clear any temporary glitches.

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This guide will help you check for common problems that cause the log ” [{}] failed to invoke shard touring changed callback ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: shard, index.

Log Context

Log “[{}] failed to invoke shard touring changed callback” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

    public void shardRoutingChanged(IndexShard indexShard; @Nullable ShardRouting oldRouting; ShardRouting newRouting) {
        for (IndexEventListener listener : listeners) {
            try {
                listener.shardRoutingChanged(indexShard; oldRouting; newRouting);
            } catch (Exception e) {
                logger.warn(() -> new ParameterizedMessage("[{}] failed to invoke shard touring changed callback";
                    indexShard.shardId().getId()); e);


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