hfutatzhanghb opened a new pull request, #7533:
URL: https://github.com/apache/hadoop/pull/7533
### Description of PR
RouterNetworkTopologyServlet adapts to async router rpc.
Currently, we will get NPE when request RouterNetworkTopologyServlet using
async router rpc. Logs as below:
```java
2025-03-25 13:53:26,300 [qtp1085041526-1172] WARN server.HttpChannel
(HttpChannel.java:handleException(776)) - /topology
java.lang.NullPointerException
at java.util.Objects.requireNonNull(Objects.java:203)
at java.util.Arrays$ArrayList.<init>(Arrays.java:3813)
at java.util.Arrays.asList(Arrays.java:3800)
at
org.apache.hadoop.hdfs.server.federation.router.RouterNetworkTopologyServlet.doGet(RouterNetworkTopologyServlet.java:55)
```
### How was this patch tested?
Add an unit test.
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