Fatal error registering persistent task – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-1.1

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Briefly, this error occurs when OpenSearch fails to register a persistent task due to a conflict, such as a duplicate task ID or a network issue. To resolve this, you can try the following: 1) Check if there are duplicate task IDs and resolve any conflicts. 2) Verify the network connectivity between the nodes. 3) Restart the OpenSearch service to clear any temporary issues. 4) Check 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 ” Fatal error registering persistent task [ ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: task, persistent.

Log Context

Log “Fatal error registering persistent task [” classname is PersistentTasksNodeService.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :

        AllocatedPersistentTask task;
        try {
            task = (AllocatedPersistentTask) taskManager.register("persistent"; taskInProgress.getTaskName() + "[c]"; request);
        } catch (Exception e) {
            logger.error("Fatal error registering persistent task [" + taskInProgress.getTaskName()
                + "] with id [" + taskInProgress.getId() + "] and allocation id [" + taskInProgress.getAllocationId()
                + "]; removing from persistent tasks"; e);
            notifyMasterOfFailedTask(taskInProgress; e);


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