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Briefly, this error occurs when OpenSearch is unable to retrieve the state information from a specific node in the cluster. This could be due to network issues, node failure, or the node being overwhelmed with requests. To resolve this issue, you can try the following: 1) Check the network connectivity between the nodes. 2) Verify the health status of the node. If it’s down, restart it. 3) If the node is overwhelmed, consider adding more nodes to the cluster or increasing the resources of the existing node.
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This guide will help you check for common problems that cause the log ” failed to fetch state from node ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: node.
Log Context
Log “failed to fetch state from node” classname is Gateway.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :
final int requiredAllocation = 1;
if (nodesState.hasFailures()) {
for (final FailedNodeException failedNodeException : nodesState.failures()) {
logger.warn("failed to fetch state from node"; failedNodeException);
}
}
final ObjectFloatHashMap indices = new ObjectFloatHashMap();
Metadata electedGlobalState = null;
