hfutatzhanghb commented on code in PR #7108:
URL: https://github.com/apache/hadoop/pull/7108#discussion_r1796318649
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hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RouterRpcServer.java:
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@@ -791,6 +801,46 @@ <T> T invokeAtAvailableNs(RemoteMethod method, Class<T>
clazz)
return invokeOnNs(method, clazz, io, nss);
}
+ /**
+ * Invokes the method at default namespace, if default namespace is not
+ * available then at the other available namespaces.
+ * If the namespace is unavailable, retry with other namespaces.
+ * Asynchronous version of invokeAtAvailableNs method.
+ * @param <T> expected return type.
+ * @param method the remote method.
+ * @return the response received after invoking method.
+ * @throws IOException
+ */
+ <T> T invokeAtAvailableNsAsync(RemoteMethod method, Class<T> clazz)
+ throws IOException {
+ String nsId = subclusterResolver.getDefaultNamespace();
+ // If default Ns is not present return result from first namespace.
+ Set<FederationNamespaceInfo> nss = namenodeResolver.getNamespaces();
+ // If no namespace is available, throw IOException.
+ IOException io = new IOException("No namespace available.");
+
+ asyncComplete(null);
+ if (!nsId.isEmpty()) {
+ asyncTry(() -> {
+ rpcClient.invokeSingle(nsId, method, clazz);
+ });
+
+ asyncCatch((AsyncCatchFunction<T, IOException>)(res, ioe) -> {
+ if (!clientProto.isUnavailableSubclusterException(ioe)) {
+ LOG.debug("{} exception cannot be retried",
+ ioe.getClass().getSimpleName());
+ throw ioe;
+ }
+ nss.removeIf(n -> n.getNameserviceId().equals(nsId));
+ invokeOnNs(method, clazz, io, nss);
Review Comment:
Thanks, fixed.
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