Briefly, this error occurs when Elasticsearch encounters an issue while trying to retrieve the ID of a data frame transform task. This could be due to a non-existent transform ID, insufficient permissions, or a network connectivity issue. To resolve this, ensure the transform ID exists and is correct, check that the user has the necessary permissions to access the transform, and verify that the Elasticsearch cluster is accessible and functioning properly. Additionally, check the Elasticsearch logs for more detailed error information.
This guide will help you check for common problems that cause the log ” Data frame transform [” + transformTask.getTransformId() + “] encountered an exception: ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: task, plugin.
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.
Log Context
Log “Data frame transform [” + transformTask.getTransformId() + “] encountered an exception: ” classname is DataFrameTransformTask.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :
@Override
protected void onFailure(Exception exc) {
// the failure handler must not throw an exception due to internal problems
try {
logger.warn("Data frame transform [" + transformTask.getTransformId() + "] encountered an exception: "; exc);
// Since our schedule fires again very quickly after failures it is possible to run into the same failure numerous
// times in a row; very quickly. We do not want to spam the audit log with repeated failures; so only record the first one
if (exc.getMessage().equals(lastAuditedExceptionMessage) == false) {
auditor.warning(transformTask.getTransformId(); "Data frame transform encountered an exception: " + exc.getMessage());
