/**
* 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.hive.ql.udf.generic;
import org.apache.hadoop.hive.ql.exec.Description;
import org.apache.hadoop.hive.ql.exec.MapredContext;
import org.apache.hadoop.hive.ql.exec.UDFArgumentException;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorFactory;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.mapred.Counters;
import org.apache.hadoop.mapred.Reporter;
@Description(name = "counter",
value = "_FUNC_(col) - UDF to report MR counter values")
public class DummyContextUDF extends GenericUDF {
private MapredContext context;
private LongWritable result = new LongWritable();
public ObjectInspector initialize(ObjectInspector[] arguments) throws UDFArgumentException {
return PrimitiveObjectInspectorFactory.writableLongObjectInspector;
}
public Object evaluate(DeferredObject[] arguments) throws HiveException {
Reporter reporter = context.getReporter();
Counters.Counter counter = reporter.getCounter("org.apache.hadoop.mapred.Task$Counter", "MAP_INPUT_RECORDS");
result.set(counter.getValue());
return result;
}
public String getDisplayString(String[] children) {
return "dummy-func()";
}
@Override
public void configure(MapredContext context) {
this.context = context;
}
}