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

Opster Team

Aug-23, Version: 6.8-7.1

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Briefly, this error occurs when Elasticsearch tries to send a ban for tasks with a parent to a node that is not available or does not exist. This could be due to network issues, node failure, or incorrect configuration. To resolve this issue, you can check the network connectivity, ensure the node is running properly, or verify the configuration settings. If the problem persists, consider reindexing your data or restarting your Elasticsearch cluster.

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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 Elasticsearch concepts: node.

Log Context

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


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


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