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Briefly, this error occurs when a task in OpenSearch fails due to an exception, which could be caused by various issues such as incorrect configurations, insufficient resources, or bugs in the code. To resolve this, you can start by checking the full error message and stack trace to identify the root cause. If it’s a configuration issue, correct the settings. If it’s a resource issue, allocate more resources. If it’s a code bug, you may need to update or fix the code. Always ensure your OpenSearch version is up-to-date to avoid known bugs.
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This guide will help you check for common problems that cause the log ” task {} failed with an exception ” 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 {} failed with an exception” classname is AllocatedPersistentTask.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :
final State prevState = state.getAndSet(State.COMPLETED);
if (prevState == State.COMPLETED) {
logger.warn("attempt to complete task [{}] with id [{}] in the [{}] state"; getAction(); getPersistentTaskId(); prevState);
} else {
if (failure != null) {
logger.warn(() -> new ParameterizedMessage("task {} failed with an exception"; getPersistentTaskId()); failure);
}
try {
this.failure = failure;
if (prevState == State.STARTED) {
logger.trace("sending notification for completed task [{}] with id [{}]"; getAction(); getPersistentTaskId());
