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org.apache.hadoop.yarn.conf.HAUtil Maven / Gradle / Ivy
/**
* 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.yarn.conf;
import java.net.InetSocketAddress;
import java.util.Collection;
import org.apache.hadoop.HadoopIllegalArgumentException;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.net.NetUtils;
import org.apache.hadoop.yarn.exceptions.YarnRuntimeException;
import org.apache.hadoop.thirdparty.com.google.common.annotations.VisibleForTesting;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@InterfaceAudience.Private
public class HAUtil {
private static Logger LOG = LoggerFactory.getLogger(HAUtil.class);
@VisibleForTesting
public static final String BAD_CONFIG_MESSAGE_PREFIX =
"Invalid configuration! ";
private HAUtil() { /* Hidden constructor */ }
private static void throwBadConfigurationException(String msg) {
throw new YarnRuntimeException(BAD_CONFIG_MESSAGE_PREFIX + msg);
}
/**
* Returns true if Federation is configured.
*
* @param conf Configuration
* @return true if federation is configured in the configuration; else false.
*/
public static boolean isFederationEnabled(Configuration conf) {
return conf.getBoolean(YarnConfiguration.FEDERATION_ENABLED,
YarnConfiguration.DEFAULT_FEDERATION_ENABLED);
}
/**
* Returns true if RM failover is enabled in a Federation setting.
*
* @param conf Configuration
* @return if RM failover is enabled in conjunction with Federation in the
* configuration; else false.
*/
public static boolean isFederationFailoverEnabled(Configuration conf) {
return conf.getBoolean(YarnConfiguration.FEDERATION_FAILOVER_ENABLED,
YarnConfiguration.DEFAULT_FEDERATION_FAILOVER_ENABLED);
}
/**
* Returns true if Resource Manager HA is configured.
*
* @param conf Configuration
* @return true if HA is configured in the configuration; else false.
*/
public static boolean isHAEnabled(Configuration conf) {
return conf.getBoolean(YarnConfiguration.RM_HA_ENABLED,
YarnConfiguration.DEFAULT_RM_HA_ENABLED);
}
public static boolean isAutomaticFailoverEnabled(Configuration conf) {
return conf.getBoolean(YarnConfiguration.AUTO_FAILOVER_ENABLED,
YarnConfiguration.DEFAULT_AUTO_FAILOVER_ENABLED);
}
public static boolean isAutomaticFailoverEnabledAndEmbedded(
Configuration conf) {
return isAutomaticFailoverEnabled(conf) &&
isAutomaticFailoverEmbedded(conf);
}
public static boolean isAutomaticFailoverEmbedded(Configuration conf) {
return conf.getBoolean(YarnConfiguration.AUTO_FAILOVER_EMBEDDED,
YarnConfiguration.DEFAULT_AUTO_FAILOVER_EMBEDDED);
}
/**
* Verify configuration for Resource Manager HA.
* @param conf Configuration
* @throws YarnRuntimeException
*/
public static void verifyAndSetConfiguration(Configuration conf)
throws YarnRuntimeException {
verifyAndSetRMHAIdsList(conf);
verifyAndSetCurrentRMHAId(conf);
verifyLeaderElection(conf);
verifyAndSetAllServiceAddresses(conf);
}
/**
* Verify configuration that there are at least two RM-ids
* and RPC addresses are specified for each RM-id.
* Then set the RM-ids.
*/
private static void verifyAndSetRMHAIdsList(Configuration conf) {
Collection ids =
conf.getTrimmedStringCollection(YarnConfiguration.RM_HA_IDS);
if (ids.size() < 2) {
throwBadConfigurationException(
getInvalidValueMessage(YarnConfiguration.RM_HA_IDS,
conf.get(YarnConfiguration.RM_HA_IDS) +
"\nHA mode requires atleast two RMs"));
}
StringBuilder setValue = new StringBuilder();
for (String id: ids) {
// verify the RM service addresses configurations for every RMIds
for (String prefix : YarnConfiguration.getServiceAddressConfKeys(conf)) {
checkAndSetRMRPCAddress(prefix, id, conf);
}
setValue.append(id)
.append(",");
}
conf.set(YarnConfiguration.RM_HA_IDS,
setValue.substring(0, setValue.length() - 1));
}
private static void verifyAndSetCurrentRMHAId(Configuration conf) {
String rmId = getRMHAId(conf);
if (rmId == null) {
StringBuilder msg = new StringBuilder();
msg.append("Can not find valid RM_HA_ID. None of ");
for (String id : conf
.getTrimmedStringCollection(YarnConfiguration.RM_HA_IDS)) {
msg.append(addSuffix(YarnConfiguration.RM_ADDRESS, id)).append(" ");
}
msg.append(" are matching" +
" the local address OR " + YarnConfiguration.RM_HA_ID + " is not" +
" specified in HA Configuration");
throwBadConfigurationException(msg.toString());
} else {
Collection ids = getRMHAIds(conf);
if (!ids.contains(rmId)) {
throwBadConfigurationException(
getRMHAIdNeedToBeIncludedMessage(ids.toString(), rmId));
}
}
conf.set(YarnConfiguration.RM_HA_ID, rmId);
}
/**
* This method validates that some leader election service is enabled. YARN
* allows leadership election to be disabled in the configuration, which
* breaks automatic failover. If leadership election is disabled, this
* method will throw an exception via
* {@link #throwBadConfigurationException(java.lang.String)}.
*
* @param conf the {@link Configuration} to validate
*/
private static void verifyLeaderElection(Configuration conf) {
if (isAutomaticFailoverEnabled(conf) &&
!conf.getBoolean(YarnConfiguration.CURATOR_LEADER_ELECTOR,
YarnConfiguration.DEFAULT_CURATOR_LEADER_ELECTOR_ENABLED) &&
!isAutomaticFailoverEmbedded(conf)) {
throwBadConfigurationException(NO_LEADER_ELECTION_MESSAGE);
}
}
@VisibleForTesting
static final String NO_LEADER_ELECTION_MESSAGE =
"The yarn.resourcemanager.ha.automatic-failover.embedded "
+ "and yarn.resourcemanager.ha.curator-leader-elector.enabled "
+ "properties are both false. One of these two properties must "
+ "be true when yarn.resourcemanager.ha.automatic-failover.enabled "
+ "is true";
private static void verifyAndSetConfValue(String prefix, Configuration conf) {
String confKey = null;
String confValue = null;
try {
confKey = getConfKeyForRMInstance(prefix, conf);
confValue = getConfValueForRMInstance(prefix, conf);
conf.set(prefix, confValue);
} catch (YarnRuntimeException yre) {
// Error at getRMHAId()
throw yre;
} catch (IllegalArgumentException iae) {
String errmsg;
if (confKey == null) {
// Error at addSuffix
errmsg = getInvalidValueMessage(YarnConfiguration.RM_HA_ID,
getRMHAId(conf));
} else {
// Error at Configuration#set.
errmsg = getNeedToSetValueMessage(confKey);
}
throwBadConfigurationException(errmsg);
}
}
public static void verifyAndSetAllServiceAddresses(Configuration conf) {
for (String confKey : YarnConfiguration.getServiceAddressConfKeys(conf)) {
verifyAndSetConfValue(confKey, conf);
}
}
/**
* @param conf Configuration. Please use getRMHAIds to check.
* @return RM Ids on success
*/
public static Collection getRMHAIds(Configuration conf) {
return conf.getStringCollection(YarnConfiguration.RM_HA_IDS);
}
/**
* @param conf Configuration. Please use verifyAndSetRMHAId to check.
* @return RM Id on success
*/
public static String getRMHAId(Configuration conf) {
int found = 0;
String currentRMId = conf.getTrimmed(YarnConfiguration.RM_HA_ID);
if(currentRMId == null) {
for(String rmId : getRMHAIds(conf)) {
String key = addSuffix(YarnConfiguration.RM_ADDRESS, rmId);
String addr = conf.get(key);
if (addr == null) {
continue;
}
InetSocketAddress s;
try {
s = NetUtils.createSocketAddr(addr);
} catch (Exception e) {
LOG.warn("Exception in creating socket address " + addr, e);
continue;
}
if (!s.isUnresolved() && NetUtils.isLocalAddress(s.getAddress())) {
currentRMId = rmId.trim();
found++;
}
}
}
if (found > 1) { // Only one address must match the local address
String msg = "The HA Configuration has multiple addresses that match "
+ "local node's address.";
throw new HadoopIllegalArgumentException(msg);
}
return currentRMId;
}
@VisibleForTesting
static String getNeedToSetValueMessage(String confKey) {
return confKey + " needs to be set in an HA configuration.";
}
@VisibleForTesting
static String getInvalidValueMessage(String confKey,
String invalidValue){
return "Invalid value of " + confKey +". "
+ "Current value is " + invalidValue;
}
@VisibleForTesting
static String getRMHAIdNeedToBeIncludedMessage(String ids,
String rmId) {
return YarnConfiguration.RM_HA_IDS + "("
+ ids + ") need to contain " + YarnConfiguration.RM_HA_ID + "("
+ rmId + ") in an HA configuration.";
}
@VisibleForTesting
static String getRMHAIdsWarningMessage(String ids) {
return "Resource Manager HA is enabled, but " +
YarnConfiguration.RM_HA_IDS + " has only one id(" +
ids.toString() + ")";
}
@InterfaceAudience.Private
@VisibleForTesting
static String getConfKeyForRMInstance(String prefix, Configuration conf) {
if (!YarnConfiguration.getServiceAddressConfKeys(conf).contains(prefix)) {
return prefix;
} else {
String RMId = getRMHAId(conf);
checkAndSetRMRPCAddress(prefix, RMId, conf);
return addSuffix(prefix, RMId);
}
}
public static String getConfValueForRMInstance(String prefix,
Configuration conf) {
String confKey = getConfKeyForRMInstance(prefix, conf);
String retVal = conf.getTrimmed(confKey);
if (LOG.isTraceEnabled()) {
LOG.trace("getConfValueForRMInstance: prefix = {};" +
" confKey being looked up = {};" +
" value being set to = {}", prefix, confKey, retVal);
}
return retVal;
}
public static String getConfValueForRMInstance(
String prefix, String defaultValue, Configuration conf) {
String value = getConfValueForRMInstance(prefix, conf);
return (value == null) ? defaultValue : value;
}
/**
* Add non empty and non null suffix to a key.
* @return the suffixed key
*/
public static String addSuffix(String key, String suffix) {
if (suffix == null || suffix.isEmpty()) {
return key;
}
if (suffix.startsWith(".")) {
throw new IllegalArgumentException("suffix '" + suffix + "' should not " +
"already have '.' prepended.");
}
return key + "." + suffix;
}
private static void checkAndSetRMRPCAddress(String prefix, String RMId,
Configuration conf) {
String rpcAddressConfKey = null;
try {
rpcAddressConfKey = addSuffix(prefix, RMId);
if (conf.getTrimmed(rpcAddressConfKey) == null) {
String hostNameConfKey = addSuffix(YarnConfiguration.RM_HOSTNAME, RMId);
String confVal = conf.getTrimmed(hostNameConfKey);
if (confVal == null) {
throwBadConfigurationException(getNeedToSetValueMessage(
hostNameConfKey + " or " + addSuffix(prefix, RMId)));
} else {
conf.set(addSuffix(prefix, RMId), confVal + ":"
+ YarnConfiguration.getRMDefaultPortNumber(prefix, conf));
}
}
} catch (IllegalArgumentException iae) {
String errmsg = iae.getMessage();
if (rpcAddressConfKey == null) {
// Error at addSuffix
errmsg = getInvalidValueMessage(YarnConfiguration.RM_HA_ID, RMId);
}
throwBadConfigurationException(errmsg);
}
}
}
