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Briefly, this error occurs when a persistent task in OpenSearch fails to execute successfully. The task ID mentioned in the error message can help identify the specific task. This could be due to various reasons such as insufficient resources, network issues, or bugs in the task code. To resolve this, you can try increasing system resources, checking network connectivity, or debugging the task code to identify and fix any issues. Additionally, checking the OpenSearch logs can provide more detailed information about the cause of the error.
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This guide will help you check for common problems that cause the log ” persistent task ” + id + ” failed ” 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 “persistent task ” + id + ” failed” classname is PersistentTasksClusterService.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :
* @param listener the listener that will be called when task is removed
*/
public void completePersistentTask(String id; long allocationId; Exception failure; ActionListener> listener) {
final String source;
if (failure != null) {
logger.warn("persistent task " + id + " failed"; failure);
source = "finish persistent task (failed)";
} else {
source = "finish persistent task (success)";
}
clusterService.submitStateUpdateTask(source; new ClusterStateUpdateTask() {
