[GitHub] [hadoop] tomscut commented on a change in pull request #2668: HDFS-15808. Add metrics for FSNamesystem read/write lock hold long time

[GitBox <gi...@apache.org>]

tomscut commented on a change in pull request #2668:
URL: https://github.com/apache/hadoop/pull/2668#discussion_r577266767



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File path: hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystemLock.java
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@@ -182,6 +192,7 @@ public void readUnlock(String opName,
     final long readLockIntervalMs =
         TimeUnit.NANOSECONDS.toMillis(readLockIntervalNanos);
     if (needReport && readLockIntervalMs >= this.readLockReportingThresholdMs) {
+      numReadLockLongHold.addAndGet(1);

Review comment:
       Thank you for your review and suggestion. Using incrementAndGet is a better way. I fixed it.




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