/**
* 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.stats;
import org.apache.hadoop.hive.ql.session.SessionState;
/**
* An test implementation for StatsAggregator.
* aggregateStats prints the length of the keyPrefix to SessionState's out stream
* All other methods are no-ops.
*/
public class KeyVerifyingStatsAggregator implements StatsAggregator {
@Override
public boolean connect(StatsCollectionContext scc) {
return true;
}
@Override
public String aggregateStats(String keyPrefix, String statType) {
SessionState ss = SessionState.get();
// Have to use the length instead of the actual prefix because the prefix is location dependent
// 17 is 16 (16 byte MD5 hash) + 1 for the path separator
// Can be less than 17 due to unicode characters
ss.out.println("Stats prefix is hashed: " + new Boolean(keyPrefix.length() <= 17));
return null;
}
@Override
public boolean closeConnection(StatsCollectionContext scc) {
return true;
}
}