Cannot send ban for tasks with the parent to the node – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch tries to send a ban for tasks with a specific parent to a node, but fails. This could be due to network issues, node unavailability, or incorrect configuration. To resolve this, you can check the network connectivity between nodes, ensure the target node is up and running, and verify the cluster’s configuration. Additionally, check the task management API to understand the tasks’ status and troubleshoot accordingly.

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This guide will help you check for common problems that cause the log ” Cannot send ban for tasks with the parent [{}] to the node [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: node.

Log Context

Log “Cannot send ban for tasks with the parent [{}] to the node [{}]” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :


                    public void handleException(TransportException exp) {
                        assert ExceptionsHelper.unwrapCause(exp) instanceof OpenSearchSecurityException == false;
                        logger.warn("Cannot send ban for tasks with the parent [{}] to the node [{}]"; taskId; node);


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