goiri commented on code in PR #5181:
URL: https://github.com/apache/hadoop/pull/5181#discussion_r1038436246
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hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/fairness/AbstractRouterRpcFairnessPolicyController.java:
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@@ -63,10 +63,14 @@ public void init(Configuration conf) {
@Override
public boolean acquirePermit(String nsId) {
try {
- LOG.debug("Taking lock for nameservice {}", nsId);
+ if (LOG.isDebugEnabled()) {
+ LOG.debug("Taking lock for nameservice {}", nsId);
Review Comment:
We have gone through this in the past.
LOG.debug with {} should already be equivalent to adding the safeguard.
Do you have some instrumentation showing that `LOG.isDebugEnabled()` is
cheaper than just calling `LOG.debug()`?
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