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Briefly, this error occurs when OpenSearch cannot find the young generation collector, which is a part of the Java Garbage Collector (GC) that handles the short-lived objects. This could impact the G1 (Garbage-First) over limit strategy, which is designed to limit the proportion of heap consumed by GC. To resolve this issue, you can try adjusting the JVM options to specify the use of the G1GC. Alternatively, you could upgrade your Java version or OpenSearch version to one where this issue has been resolved. Lastly, ensure that your system has enough resources to handle the GC processes.
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This guide will help you check for common problems that cause the log ” Unable to find young generation collector; G1 over limit strategy might be impacted [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: breaker, indices.
Log Context
Log “Unable to find young generation collector; G1 over limit strategy might be impacted [{}]” classname is HierarchyCircuitBreakerService.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :
assert youngBeans.get(0).getCollectionCount() != -1 : "G1 must support getting collection count";
if (youngBeans.size() == 1) {
return youngBeans.get(0)::getCollectionCount;
} else {
logger.warn("Unable to find young generation collector; G1 over limit strategy might be impacted [{}]"; youngBeans);
return () -> -1;
}
}
interface OverLimitStrategy {
