ayushtkn commented on pull request #3731:
URL: https://github.com/apache/hadoop/pull/3731#issuecomment-983471955
One doubt here:
What I could decode, We try on the default namespace, if it fails. We do:
```
Set<FederationNamespaceInfo> nssWithoutFailed = getNameSpaceInfo(nss, nsId);
return invokeOnNs(method, clazz, ioe, nssWithoutFailed);
```
`getNameSpaceInfo(nss, nsId)` -> This returns the namespaces, removing the
already tried namespace.
Then,
`return invokeOnNs(method, clazz, ioe, nssWithoutFailed)` -> This just tries
on the first namespace returned above.
By the code inside the method `invokeOnNs`:
```
String nsId = nss.iterator().next().getNameserviceId();
return rpcClient.invokeSingle(nsId, method, clazz);
```
So, if the first namespace returned after excluding the default namespace is
also down. Then we would still get an error, right? despite having other
namespace being available? Shouldn't this be a invokeSequential kind of stuff,
try one by one all the namespaces until you get the result. Am I missing
something here?
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