Truong Duc Kien created FLINK-19901:
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Summary: Unable to exclude metrics variables for the last metrics reporter.
Key: FLINK-19901
URL:
https://issues.apache.org/jira/browse/FLINK-19901 Project: Flink
Issue Type: Bug
Components: Runtime / Metrics
Affects Versions: 1.11.2
Reporter: Truong Duc Kien
We discovered a bug that leads to the setting {{scope.variables.excludes}} being ignored for the very last metric reporter.
Because {{reporterIndex}} was incremented before the length check, the last metrics reporter setting is overflowed back to 0.
Interestingly, this bug does not trigger when there's only one metric reporter, because slot 0 is actually overwritten with that reporter's variables instead of being used to store all variables in that case.
{code:java}
public abstract class AbstractMetricGroup<A extends AbstractMetricGroup<?>> implements MetricGroup {
...
public Map<String, String> getAllVariables(int reporterIndex, Set<String> excludedVariables) {
// offset cache location to account for general cache at position 0
reporterIndex += 1;
if (reporterIndex < 0 || reporterIndex >= logicalScopeStrings.length) {
reporterIndex = 0;
}
// if no variables are excluded (which is the default!) we re-use the general variables map to save space
return internalGetAllVariables(excludedVariables.isEmpty() ? 0 : reporterIndex, excludedVariables);
}
...
{code}
[Github link to the above code|
https://github.com/apache/flink/blob/3bf5786655c3bb914ce02ebb0e4a1863b205b829/flink-runtime/src/main/java/org/apache/flink/runtime/metrics/groups/AbstractMetricGroup.java#L122]
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