KeeProMise commented on code in PR #6988:
URL: https://github.com/apache/hadoop/pull/6988#discussion_r1792697438
##########
hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RouterRpcServer.java:
##########
@@ -791,6 +800,36 @@ <T> T invokeAtAvailableNs(RemoteMethod method, Class<T>
clazz)
return invokeOnNs(method, clazz, io, nss);
}
+ <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:
Should use invokeOnNsAsync.
##########
hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RouterRpcServer.java:
##########
@@ -791,6 +800,36 @@ <T> T invokeAtAvailableNs(RemoteMethod method, Class<T>
clazz)
return invokeOnNs(method, clazz, io, nss);
}
+ <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);
Review Comment:
Hi, @hfutatzhanghb IMO, asyncComplete(null) is not needed in this place.
##########
hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RouterAsyncStoragePolicy.java:
##########
@@ -0,0 +1,48 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.hdfs.server.federation.router;
+
+import org.apache.hadoop.hdfs.protocol.BlockStoragePolicy;
+import org.apache.hadoop.hdfs.server.federation.resolver.RemoteLocation;
+import org.apache.hadoop.hdfs.server.namenode.NameNode;
+
+import java.io.IOException;
+import java.util.List;
+
+import static
org.apache.hadoop.hdfs.server.federation.router.async.AsyncUtil.asyncReturn;
Review Comment:
Remove unused imports.
##########
hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RouterRpcServer.java:
##########
@@ -824,6 +863,49 @@ <T> T invokeOnNs(RemoteMethod method, Class<T> clazz,
IOException ioe,
throw ioe;
}
+ <T> T invokeOnNsAsync(RemoteMethod method, Class<T> clazz, IOException ioe,
+ Set<FederationNamespaceInfo> nss) throws IOException {
+ if (nss.isEmpty()) {
+ throw ioe;
+ }
+
+ asyncComplete(null);
+ Iterator<FederationNamespaceInfo> nsIterator = nss.iterator();
+ asyncForEach(nsIterator, (foreach, fnInfo) -> {
+ String nsId = fnInfo.getNameserviceId();
+ LOG.debug("Invoking {} on namespace {}", method, nsId);
+ asyncTry(() -> {
+ rpcClient.invokeSingle(nsId, method, clazz);
+ asyncApply(result -> {
+ if (result != null && isExpectedClass(clazz, result)) {
+ foreach.breakNow();
+ return result;
+ }
+ return null;
+ });
+ });
+
+ asyncCatch((AsyncCatchFunction<T, IOException>)(ret, ex) -> {
Review Comment:
Should use CatchFunction.
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