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HDFS-13743. RBF: Router throws NullPointerException due to the invalid initialization of MountTableResolver. Contributed by Takanobu Asanuma. 

(cherry picked from commit 7b25fb949b)
This commit is contained in:
Yiqun Lin 2018-07-20 17:28:57 +08:00
parent 23624c9248
commit 823d576a66
2 changed files with 102 additions and 8 deletions
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20
hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/resolver/MountTableResolver.java
View File

@ -17,6 +17,8 @@
*/
package org.apache.hadoop.hdfs.server.federation.resolver;
import static org.apache.hadoop.hdfs.client.HdfsClientConfigKeys.DFS_NAMESERVICES;
import static org.apache.hadoop.hdfs.client.HdfsClientConfigKeys.DeprecatedKeys.DFS_NAMESERVICE_ID;
import static org.apache.hadoop.hdfs.server.federation.router.RBFConfigKeys.DFS_ROUTER_DEFAULT_NAMESERVICE;
import static org.apache.hadoop.hdfs.server.federation.router.RBFConfigKeys.FEDERATION_MOUNT_TABLE_MAX_CACHE_SIZE;
import static org.apache.hadoop.hdfs.server.federation.router.RBFConfigKeys.FEDERATION_MOUNT_TABLE_MAX_CACHE_SIZE_DEFAULT;
@ -42,7 +44,6 @@ import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import org.apache.hadoop.HadoopIllegalArgumentException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.DFSUtil;
@ -149,14 +150,25 @@ public class MountTableResolver
* @param conf Configuration for this resolver.
*/
private void initDefaultNameService(Configuration conf) {
try {
this.defaultNameService = conf.get(
DFS_ROUTER_DEFAULT_NAMESERVICE,
DFSUtil.getNamenodeNameServiceId(conf));
} catch (HadoopIllegalArgumentException e) {
LOG.error("Cannot find default name service, setting it to the first");
if (defaultNameService == null) {
LOG.warn(
"{} and {} is not set. Fallback to {} as the default name service.",
DFS_ROUTER_DEFAULT_NAMESERVICE, DFS_NAMESERVICE_ID, DFS_NAMESERVICES);
Collection<String> nsIds = DFSUtilClient.getNameServiceIds(conf);
if (nsIds.isEmpty()) {
this.defaultNameService = "";
} else {
this.defaultNameService = nsIds.iterator().next();
}
}
if (this.defaultNameService.equals("")) {
LOG.warn("Default name service is not set.");
} else {
LOG.info("Default name service: {}", this.defaultNameService);
}
}

82
hadoop-hdfs-project/hadoop-hdfs-rbf/src/test/java/org/apache/hadoop/hdfs/server/federation/resolver/TestInitializeMountTableResolver.java Normal file
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@ -0,0 +1,82 @@
/**
* 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;
import org.apache.hadoop.conf.Configuration;
import org.junit.Test;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMESERVICE_ID;
import static org.apache.hadoop.hdfs.client.HdfsClientConfigKeys.DFS_NAMESERVICES;
import static org.apache.hadoop.hdfs.server.federation.router.RBFConfigKeys.DFS_ROUTER_DEFAULT_NAMESERVICE;
import static org.junit.Assert.assertEquals;
/**
* Test {@link MountTableResolver} initialization.
*/
public class TestInitializeMountTableResolver {
@Test
public void testDefaultNameserviceIsMissing() {
Configuration conf = new Configuration();
MountTableResolver mountTable = new MountTableResolver(conf);
assertEquals("", mountTable.getDefaultNamespace());
}
@Test
public void testDefaultNameserviceWithEmptyString() {
Configuration conf = new Configuration();
conf.set(DFS_ROUTER_DEFAULT_NAMESERVICE, "");
MountTableResolver mountTable = new MountTableResolver(conf);
assertEquals("", mountTable.getDefaultNamespace());
}
@Test
public void testRouterDefaultNameservice() {
Configuration conf = new Configuration();
conf.set(DFS_ROUTER_DEFAULT_NAMESERVICE, "router_ns"); // this is priority
conf.set(DFS_NAMESERVICE_ID, "ns_id");
conf.set(DFS_NAMESERVICES, "nss");
MountTableResolver mountTable = new MountTableResolver(conf);
assertEquals("router_ns", mountTable.getDefaultNamespace());
}
@Test
public void testNameserviceID() {
Configuration conf = new Configuration();
conf.set(DFS_NAMESERVICE_ID, "ns_id"); // this is priority
conf.set(DFS_NAMESERVICES, "nss");
MountTableResolver mountTable = new MountTableResolver(conf);
assertEquals("ns_id", mountTable.getDefaultNamespace());
}
@Test
public void testSingleNameservices() {
Configuration conf = new Configuration();
conf.set(DFS_NAMESERVICES, "ns1");
MountTableResolver mountTable = new MountTableResolver(conf);
assertEquals("ns1", mountTable.getDefaultNamespace());
}
@Test
public void testMultipleNameservices() {
Configuration conf = new Configuration();
conf.set(DFS_NAMESERVICES, "ns1,ns2");
MountTableResolver mountTable = new MountTableResolver(conf);
assertEquals("ns1", mountTable.getDefaultNamespace());
}
}