simbadzina commented on code in PR #5683:
URL: https://github.com/apache/hadoop/pull/5683#discussion_r1204749915
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hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/metrics/FederationRPCPerformanceMonitor.java:
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@@ -153,7 +157,7 @@ public void proxyOpComplete(boolean success, String nsId,
if (success) {
long proxyTime = getProxyTime();
if (proxyTime >= 0) {
- if (metrics != null) {
+ if (metrics != null && !nsId.equals(CONCURRENT)) {
Review Comment:
Can you switch the test to `!CONCURRENT.equals(nsId)`
Looking at the code, the one case where nsId is null, success is also equal
to false so we don't get a nullpointerexception. However, it is still good to
switch the code to be more defensive.
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