HDFS-17406. Suppress UnresolvedPathException in hdfs router log (#6603)

Author: haiyang1987

hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RouterRpcServer.java

@@ -57,6 +57,7 @@
 
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.hdfs.HAUtil;
+import org.apache.hadoop.hdfs.protocol.UnresolvedPathException;
 import org.apache.hadoop.thirdparty.com.google.common.cache.CacheBuilder;
 import org.apache.hadoop.thirdparty.com.google.common.cache.CacheLoader;
 import org.apache.hadoop.thirdparty.com.google.common.cache.LoadingCache;
@@ -369,7 +370,7 @@ public RouterRpcServer(Configuration conf, Router router,
         RetriableException.class);
 
     this.rpcServer.addSuppressedLoggingExceptions(
-        StandbyException.class);
+        StandbyException.class, UnresolvedPathException.class);
 
     // The RPC-server port can be ephemeral... ensure we have the correct info
     InetSocketAddress listenAddress = this.rpcServer.getListenerAddress();