[GitHub] [hadoop] goiri commented on a diff in pull request #5990: HDFS-17166. RBF: Throwing NoNamenodesAvailableException for a long time, when failover

["goiri (via GitHub)" <gi...@apache.org>]

goiri commented on code in PR #5990:
URL: https://github.com/apache/hadoop/pull/5990#discussion_r1313249948


##########
hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RouterRpcClient.java:
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@@ -599,6 +599,9 @@ public Object invokeMethod(
           }
           LOG.error("Cannot get available namenode for {} {} error: {}",
               nsId, rpcAddress, ioe.getMessage());
+          if (this.namenodeResolver != null) {
+            this.namenodeResolver.rotateCache(nsId, namenode, shouldUseObserver);

Review Comment:
   It'd be nice to add a log for people to understand what's is happening.
   I don't know if it should be behind a config though.



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