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YARN-8169. Cleanup RackResolver.java 

Signed-off-by: Akira Ajisaka <aajisaka@apache.org>
This commit is contained in:
BELUGA BEHR 2018-04-19 16:07:14 +09:00 committed by Akira Ajisaka
parent e4c39f3247
commit 351e509a47
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1 changed files with 24 additions and 25 deletions
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49
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/util/RackResolver.java
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@ -18,11 +18,9 @@
package org.apache.hadoop.yarn.util;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceAudience.Private;
import org.apache.hadoop.conf.Configuration;
@ -34,24 +32,31 @@
import org.apache.hadoop.net.NodeBase;
import org.apache.hadoop.net.ScriptBasedMapping;
import org.apache.hadoop.util.ReflectionUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.annotations.VisibleForTesting;
@InterfaceAudience.LimitedPrivate({"YARN", "MAPREDUCE"})
public class RackResolver {
public final class RackResolver {
private static DNSToSwitchMapping dnsToSwitchMapping;
private static boolean initCalled = false;
private static final Log LOG = LogFactory.getLog(RackResolver.class);
private static final Logger LOG = LoggerFactory.getLogger(RackResolver.class);
/**
* Hide the default constructor for utility class.
*/
private RackResolver() {
}
public synchronized static void init(Configuration conf) {
if (initCalled) {
return;
} else {
initCalled = true;
}
initCalled = true;
Class<? extends DNSToSwitchMapping> dnsToSwitchMappingClass =
conf.getClass(
CommonConfigurationKeysPublic.NET_TOPOLOGY_NODE_SWITCH_MAPPING_IMPL_KEY,
conf.getClass(
CommonConfigurationKeysPublic.NET_TOPOLOGY_NODE_SWITCH_MAPPING_IMPL_KEY,
ScriptBasedMapping.class,
DNSToSwitchMapping.class);
try {
@ -67,10 +72,10 @@ public synchronized static void init(Configuration conf) {
throw new RuntimeException(e);
}
}
/**
* Utility method for getting a hostname resolved to a node in the
* network topology. This method initializes the class with the
* network topology. This method initializes the class with the
* right resolver implementation.
* @param conf
* @param hostName
@ -94,33 +99,27 @@ public static Node resolve(String hostName) {
}
return coreResolve(hostName);
}
private static Node coreResolve(String hostName) {
List <String> tmpList = new ArrayList<String>(1);
tmpList.add(hostName);
List <String> tmpList = Collections.singletonList(hostName);
List <String> rNameList = dnsToSwitchMapping.resolve(tmpList);
String rName = null;
String rName = NetworkTopology.DEFAULT_RACK;
if (rNameList == null || rNameList.get(0) == null) {
rName = NetworkTopology.DEFAULT_RACK;
if (LOG.isDebugEnabled()) {
LOG.debug("Couldn't resolve " + hostName + ". Falling back to "
+ NetworkTopology.DEFAULT_RACK);
}
LOG.debug("Could not resolve {}. Falling back to {}", hostName,
NetworkTopology.DEFAULT_RACK);
} else {
rName = rNameList.get(0);
if (LOG.isDebugEnabled()) {
LOG.debug("Resolved " + hostName + " to " + rName);
}
LOG.debug("Resolved {} to {}", hostName, rName);
}
return new NodeBase(hostName, rName);
}
/**
* Only used by tests
* Only used by tests.
*/
@Private
@VisibleForTesting
static DNSToSwitchMapping getDnsToSwitchMapping(){
static DNSToSwitchMapping getDnsToSwitchMapping() {
return dnsToSwitchMapping;
}
}