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Briefly, this error occurs when OpenSearch tries to update a task that doesn’t exist in its task management system. This could be due to a task being deleted or completed before the update command was executed. To resolve this issue, you can ensure that tasks are not deleted or completed prematurely. Also, check your task management logic to ensure tasks are properly created before any update operations. Additionally, consider implementing error handling to catch and handle such exceptions, preventing the system from crashing or behaving unexpectedly.
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This guide will help you check for common problems that cause the log ” trying to update state on non-existing task {} ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: task, persistent.
Overview
In OpenSearch, persistent refers to cluster settings that persist across cluster restarts. This setting is used in Cluster Update API calls. Persistent settings can also be configured in the opensearch.yml file.
Examples
## enable shard routing
PUT /_cluster/settings
{
"persistent" : {
"cluster.routing.allocation.enable" : "all"
}
}
## enable rebalancing of shards
PUT /_cluster/settings
{
"persistent" : {
"cluster.routing.rebalance.enable" : "all"
}
}
## limit the heap size for fielddata
PUT /_cluster/settings
{
"persistent" : {
“indices.breaker.fielddata.limit”: "30%"
}
}Log Context
Log “trying to update state on non-existing task {}” classname is PersistentTasksClusterService.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :
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);
}
}
