Briefly, this error occurs when an Elasticsearch reset task is cancelled due to a delete request. This typically happens when a delete operation is performed on an index while a reset task is ongoing. To resolve this issue, you can either wait for the reset task to complete before performing the delete operation or cancel the reset task manually before initiating the delete operation. Additionally, ensure that no automated scripts or applications are sending conflicting requests to Elasticsearch.
This guide will help you check for common problems that cause the log ” [{}] Cancelling reset task [{}] because delete was requested ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin, task, delete.
Overview
A task is an Elasticsearch operation, which can be any request performed on an Elasticsearch cluster, such as a delete by query request, a search request and so on. Elasticsearch provides a dedicated Task API for the task management which includes various actions, from retrieving the status of current running tasks to canceling any long running task.
Examples
Get all currently running tasks on all nodes of the cluster
Apart from other information, the response of the below request contains task IDs of all the tasks which can be used to get detailed information about the particular task in question.
GET _tasks
Get detailed information of a particular task
Where clQFAL_VRrmnlRyPsu_p8A:1132678759 is the ID of the task in below request
GET _tasks/clQFAL_VRrmnlRyPsu_p8A:1132678759
Get all the current tasks running on particular nodes
GET _tasks?nodes=nodeId1,nodeId2
Cancel a task
Where clQFAL_VRrmnlRyPsu_p8A:1132678759 is the ID of the task in the below request
POST /_tasks/clQFAL_VRrmnlRyPsu_p8A:1132678759/_cancel?pretty
Notes
- The Task API will be most useful when you want to investigate the spike of resource utilization in the cluster or want to cancel an operation.
Overview
DELETE is an Elasticsearch API which removes a document from a specific index. This API requires an index name and _id document to delete the document.
Delete a document
DELETE /my_index/_doc/1
Notes
- A delete request throws 404 error code if the document does not already exist in the index.
- If you want to delete a set of documents that matches a query, you need to use delete by query API.
Log Context
Log “[{}] Cancelling reset task [{}] because delete was requested” classname is TransportDeleteJobAction.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :
private void cancelResetTaskIfExists(String jobId; ActionListener listener) {
ActionListener jobListener = ActionListener.wrap(jobBuilder -> {
Job job = jobBuilder.build();
if (job.getBlocked().getReason() == Blocked.Reason.RESET) {
logger.info("[{}] Cancelling reset task [{}] because delete was requested"; jobId; job.getBlocked().getTaskId());
CancelTasksRequest cancelTasksRequest = new CancelTasksRequest();
cancelTasksRequest.setReason("deleting job");
cancelTasksRequest.setActions(ResetJobAction.NAME);
cancelTasksRequest.setTargetTaskId(job.getBlocked().getTaskId());
executeAsyncWithOrigin(
