org.apache.hadoop.tracing.TraceUtils 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.tracing;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.tracing.SpanReceiverInfo.ConfigurationPair;
import org.apache.htrace.core.HTraceConfiguration;
/**
* This class provides utility functions for tracing.
*/
@InterfaceAudience.Private
public class TraceUtils {
private static List EMPTY = Collections.emptyList();
static final String DEFAULT_HADOOP_TRACE_PREFIX = "hadoop.htrace.";
public static HTraceConfiguration wrapHadoopConf(final String prefix,
final Configuration conf) {
return wrapHadoopConf(prefix, conf, EMPTY);
}
public static HTraceConfiguration wrapHadoopConf(final String prefix,
final Configuration conf, List extraConfig) {
final HashMap extraMap = new HashMap();
for (ConfigurationPair pair : extraConfig) {
extraMap.put(pair.getKey(), pair.getValue());
}
return new HTraceConfiguration() {
@Override
public String get(String key) {
String ret = getInternal(prefix + key);
if (ret != null) {
return ret;
}
return getInternal(DEFAULT_HADOOP_TRACE_PREFIX + key);
}
@Override
public String get(String key, String defaultValue) {
String ret = get(key);
if (ret != null) {
return ret;
}
return defaultValue;
}
private String getInternal(String key) {
if (extraMap.containsKey(key)) {
return extraMap.get(key);
}
return conf.get(key);
}
};
}
}