Unknown response type expected NodeSnapshotStatus or FailedNodeException – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 2.3-2.3

Briefly, this error occurs when Elasticsearch expects a response type of either NodeSnapshotStatus or FailedNodeException, but receives an unexpected type. This could be due to a version mismatch between nodes or a bug in the code. To resolve this issue, ensure all nodes are running the same version of Elasticsearch. If the problem persists, check the code for any bugs that might be causing the unexpected response type. Additionally, consider checking the Elasticsearch logs for more detailed error information.

This guide will help you check for common problems that cause the log ” unknown response type [{}]; expected NodeSnapshotStatus or FailedNodeException ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: admin, cluster, node, response and snapshot.

Log Context

Log “unknown response type [{}]; expected NodeSnapshotStatus or FailedNodeException” classname is TransportNodesSnapshotsStatus.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

             if (resp instanceof NodeSnapshotStatus) { // will also filter out null response for unallocated ones
                nodesList.add((NodeSnapshotStatus) resp);
            } else if (resp instanceof FailedNodeException) {
                failures.add((FailedNodeException) resp);
            } else {
                logger.warn("unknown response type [{}]; expected NodeSnapshotStatus or FailedNodeException"; resp);
            }
        }
        return new NodesSnapshotStatus(clusterName; nodesList.toArray(new NodeSnapshotStatus[nodesList.size()]);
                failures.toArray(new FailedNodeException[failures.size()]));
    }




 

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