Trying to update state on task with unexpected allocation id – 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 update the state of a task with an allocation ID that it doesn’t recognize. This could be due to a synchronization issue or a problem with the cluster state. To resolve this, you could try restarting the nodes in your cluster to refresh the state. If the problem persists, you may need to investigate the cluster state for inconsistencies or corruption. In extreme cases, you might need to rebuild the cluster. Always ensure to have a backup of your data to prevent any loss.

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This guide will help you check for common problems that cause the log ” trying to update state on task {} with unexpected allocation id {} ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: allocation, task, persistent.

Log Context

Log “trying to update state on task {} with unexpected allocation id {}” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

                PersistentTasksCustomMetadata.Builder tasksInProgress = builder(currentState);
                if (tasksInProgress.hasTask(taskId; taskAllocationId)) {
                    return update(currentState; tasksInProgress.updateTaskState(taskId; taskState));
                } else {
                    if (tasksInProgress.hasTask(taskId)) {
                        logger.warn("trying to update state on task {} with unexpected allocation id {}"; taskId; taskAllocationId);
                    } else {
                        logger.warn("trying to update state on non-existing task {}"; taskId);
                    throw new ResourceNotFoundException("the task with id {} and allocation id {} doesn't exist"; taskId; taskAllocationId);


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