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https://issues.apache.org/jira/browse/HDFS-4043?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17578987#comment-17578987
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ASF GitHub Bot commented on HDFS-4043:
--------------------------------------
ndimiduk commented on code in PR #4693:
URL: https://github.com/apache/hadoop/pull/4693#discussion_r944499525
##########
hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/net/TestInetAddressUtils.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.net;
+
+import org.junit.Test;
+
+import java.net.InetAddress;
+import java.net.UnknownHostException;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotEquals;
+
+
+public class TestInetAddressUtils {
+
+ @Test
+ public void testGetCanonicalHostName() throws UnknownHostException {
+ InetAddress localhost = InetAddress.getLocalHost();
+ InetAddress unresolved =
InetAddress.getByAddress(localhost.getHostAddress(),
+ localhost.getAddress());
+
+ // Precondition: host name and canonical host name for unresolved returns
an IP address.
+ assertEquals(localhost.getHostAddress(), unresolved.getHostName());
Review Comment:
Hmm yes, I see no mention of `jdk.net.hosts.file` in the `InetAddress` of
OpenJDK8.
> Namenode Kerberos Login does not use proper hostname for host qualified hdfs
> principal name.
> --------------------------------------------------------------------------------------------
>
> Key: HDFS-4043
> URL: https://issues.apache.org/jira/browse/HDFS-4043
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: security
> Affects Versions: 2.0.0-alpha, 2.0.1-alpha, 2.0.2-alpha, 2.0.3-alpha
> Environment: CDH4U1 on Ubuntu 12.04
> Reporter: Ahad Rana
> Priority: Major
> Labels: pull-request-available
> Original Estimate: 24h
> Time Spent: 50m
> Remaining Estimate: 23h 10m
>
> The Namenode uses the loginAsNameNodeUser method in NameNode.java to login
> using the hdfs principal. This method in turn invokes SecurityUtil.login with
> a hostname (last parameter) obtained via a call to InetAddress.getHostName.
> This call does not always return the fully qualified host name, and thus
> causes the namenode to login to fail due to kerberos's inability to find a
> matching hdfs principal in the hdfs.keytab file. Instead it should use
> InetAddress.getCanonicalHostName. This is consistent with what is used
> internally by SecurityUtil.java to login in other services, such as the
> DataNode.
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