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Briefly, this error occurs when OpenSearch tries to create a task with an ID that already exists in the system. This could be due to a programming error or a synchronization issue. To resolve this, you can first try to delete the existing task with the same ID if it’s no longer needed. If the task is still required, you can try to assign a unique ID to the new task. Alternatively, you can implement a check before creating a task to ensure the ID does not already exist.
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This guide will help you check for common problems that cause the log ” task with id {” + taskId + “} already exist ” 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 “task with id {” + taskId + “} already exist” class name is PersistentTasksClusterService.java. We extracted the following from OpenSearch source code for those seeking an in-depth context :
clusterService.submitStateUpdateTask("create persistent task"; new ClusterStateUpdateTask() {
@Override
public ClusterState execute(ClusterState currentState) {
PersistentTasksCustomMetadata.Builder builder = builder(currentState);
if (builder.hasTask(taskId)) {
throw new ResourceAlreadyExistsException("task with id {" + taskId + "} already exist");
} PersistentTasksExecutor taskExecutor = registry.getPersistentTaskExecutorSafe(taskName);
taskExecutor.validate(taskParams; currentState);
