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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 com.google.common.annotations.VisibleForTesting;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.yarn.exceptions.YarnRuntimeException;
import java.util.Collection;
@InterfaceAudience.Private
public class HAUtil {
private static Log LOG = LogFactory.getLog(HAUtil.class);
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 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);
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.RM_SERVICES_ADDRESS_CONF_KEYS) {
String confKey = null;
try {
confKey = addSuffix(prefix, id);
if (conf.getTrimmed(confKey) == null) {
throwBadConfigurationException(getNeedToSetValueMessage(confKey));
}
} catch (IllegalArgumentException iae) {
String errmsg = iae.getMessage();
if (confKey == null) {
// Error at addSuffix
errmsg = getInvalidValueMessage(YarnConfiguration.RM_HA_ID,
getRMHAId(conf));
}
throwBadConfigurationException(errmsg);
}
}
setValue.append(id);
setValue.append(",");
}
conf.set(YarnConfiguration.RM_HA_IDS,
setValue.substring(0, setValue.length() - 1));
}
private static void verifyAndSetCurrentRMHAId(Configuration conf) {
String rmId = conf.getTrimmed(YarnConfiguration.RM_HA_ID);
if (rmId == null) {
throwBadConfigurationException(
getNeedToSetValueMessage(YarnConfiguration.RM_HA_ID));
} else {
Collection ids = getRMHAIds(conf);
if (!ids.contains(rmId)) {
throwBadConfigurationException(
getRMHAIdNeedToBeIncludedMessage(ids.toString(), rmId));
}
}
conf.set(YarnConfiguration.RM_HA_ID, rmId);
}
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.RM_SERVICES_ADDRESS_CONF_KEYS) {
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) {
return conf.get(YarnConfiguration.RM_HA_ID);
}
@VisibleForTesting
static String getNeedToSetValueMessage(String confKey) {
return confKey + " needs to be set in a 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 a 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) {
return YarnConfiguration.RM_SERVICES_ADDRESS_CONF_KEYS.contains(prefix)
? addSuffix(prefix, getRMHAId(conf))
: prefix;
}
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 = " + prefix +
"; confKey being looked up = " + confKey +
"; value being set to = " + 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 */
@VisibleForTesting
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;
}
}
