zhuxiangyi commented on a change in pull request #2915:
URL: https://github.com/apache/hadoop/pull/2915#discussion_r616332454
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File path:
hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/metrics/NamenodeBeanMetrics.java
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@@ -855,7 +855,7 @@ public long getNumberOfSnapshottableDirs() {
@Override
public String getEnteringMaintenanceNodes() {
- return "N/A";
+ return null;
Review comment:
Thanks for your review @goiri , I think returning "{}" is more friendly
than "null". I submitted new code and added tests.
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