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https://issues.apache.org/jira/browse/HDFS-17534?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17852618#comment-17852618
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ASF GitHub Bot commented on HDFS-17534:
---------------------------------------
kokonguyen191 commented on code in PR #6861:
URL: https://github.com/apache/hadoop/pull/6861#discussion_r1628697623
##########
hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/resolver/order/LeaderFollowerResolver.java:
##########
@@ -0,0 +1,40 @@
+/*
+ * 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.resolver.order;
+
+import org.apache.hadoop.hdfs.server.federation.resolver.PathLocation;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.Set;
+
+public class LeaderFollowerResolver implements OrderedResolver {
+ protected static final Logger LOG =
+ LoggerFactory.getLogger(LeaderFollowerResolver.class);
+
+ @Override
+ public String getFirstNamespace(String path, PathLocation loc) {
+ // always return first destination
+ Set<String> namespaces = loc.getNamespaces(true);
Review Comment:
You can directly use `PathLocation#getDefaultLocation` and revert all the
changes in `PathLocation`.
> RBF: Support leader follower mode for multiple subclusters
> ----------------------------------------------------------
>
> Key: HDFS-17534
> URL: https://issues.apache.org/jira/browse/HDFS-17534
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: rbf
> Reporter: Yuanbo Liu
> Assignee: Yuanbo Liu
> Priority: Major
> Labels: pull-request-available
>
> Currently there are five modes in multiple subclusters like
> HASH, LOCAL, RANDOM, HASH_ALL,SPACE;
> Proposal a new mode called leader/follower mode. routers try to write to
> leader subcluster as many as possible. When routers read data, put leader
> subcluster into first rank.
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