Failed to remove the parent ban for task on 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 remove a parent task ban from a node but fails. This could be due to a network issue, a node failure, or a problem with the task management system. To resolve this issue, you can try restarting the node, checking the network connections, or investigating the task management system for any inconsistencies or errors. If the problem persists, consider checking the OpenSearch logs for more detailed error information.

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This guide will help you check for common problems that cause the log ” failed to remove the parent ban for task {} on node {} ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: task, node.

Log Context

Log “failed to remove the parent ban for task {} on node {}” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

            logger.trace("Sending remove ban for tasks with the parent [{}] to the node [{}]"; request.parentTaskId; node);
            transportService.sendRequest(node; BAN_PARENT_ACTION_NAME; request; new EmptyTransportResponseHandler(ThreadPool.Names.SAME) {
                public void handleException(TransportException exp) {
                    assert ExceptionsHelper.unwrapCause(exp) instanceof OpenSearchSecurityException == false;
          "failed to remove the parent ban for task {} on node {}"; request.parentTaskId; node);


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