Failed to mark thread execution started for task – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 2.2-2.9

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Briefly, this error occurs when OpenSearch fails to initiate a thread for a specific task. This could be due to a variety of reasons such as insufficient system resources, a bug in the software, or a problem with the task itself. To resolve this issue, you could try increasing system resources, updating OpenSearch to the latest version, or checking the task for any errors or inconsistencies. If the problem persists, consider seeking help from the OpenSearch community or support team.

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This guide will help you check for common problems that cause the log ” Failed to mark thread execution started for task: [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: thread.

Log Context

Log “Failed to mark thread execution started for task: [{}]” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

            if (task != null) {
                logger.debug("Task execution started on thread. Task: {}; Thread: {}"; taskId; threadId);
                task.startThreadResourceTracking(threadId; WORKER_STATS; getResourceUsageMetricsForThread(threadId));
        } catch (Exception e) {
            logger.warn(new ParameterizedMessage("Failed to mark thread execution started for task: [{}]"; taskId); e);
            assert false;



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