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Briefly, this error occurs when OpenSearch fails to reassign tasks that are designed to persist across cluster restarts. This could be due to issues like network problems, node failures, or insufficient resources. To resolve this, you can try the following: 1) Check the cluster health and ensure all nodes are functioning properly. 2) Verify network connectivity between nodes. 3) Ensure there are sufficient resources (CPU, memory, disk space) for the tasks to run. 4) If a specific task is causing the issue, try to isolate and troubleshoot it separately.
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This guide will help you check for common problems that cause the log ” failed to reassign persistent tasks ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: 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 “failed to reassign persistent tasks” classname is PersistentTasksClusterService.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :
return reassignTasks(currentState);
}
@Override
public void onFailure(String source; Exception e) {
logger.warn("failed to reassign persistent tasks"; e);
if (e instanceof NotClusterManagerException == false) {
// There must be a task that's worth rechecking because there was one
// that caused this method to be called and the method failed to assign it;
// but only do this if the node is still the master
periodicRechecker.rescheduleIfNecessary();
