/**
* 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.optimizer;
import java.util.Stack;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hive.conf.HiveConf.ConfVars;
import org.apache.hadoop.hive.ql.exec.AppMasterEventOperator;
import org.apache.hadoop.hive.ql.exec.Operator;
import org.apache.hadoop.hive.ql.lib.Node;
import org.apache.hadoop.hive.ql.lib.NodeProcessor;
import org.apache.hadoop.hive.ql.lib.NodeProcessorCtx;
import org.apache.hadoop.hive.ql.parse.OptimizeTezProcContext;
import org.apache.hadoop.hive.ql.parse.SemanticException;
import org.apache.hadoop.hive.ql.plan.AppMasterEventDesc;
import org.apache.hadoop.hive.ql.plan.DynamicPruningEventDesc;
/**
* If we expect the number of keys for dynamic pruning to be too large we
* disable it.
*/
public class RemoveDynamicPruningBySize implements NodeProcessor {
static final private Log LOG = LogFactory.getLog(RemoveDynamicPruningBySize.class.getName());
@Override
public Object process(Node nd, Stack<Node> stack, NodeProcessorCtx procContext,
Object... nodeOutputs)
throws SemanticException {
OptimizeTezProcContext context = (OptimizeTezProcContext) procContext;
AppMasterEventOperator event = (AppMasterEventOperator) nd;
AppMasterEventDesc desc = event.getConf();
if (desc.getStatistics().getDataSize() > context.conf
.getLongVar(ConfVars.TEZ_DYNAMIC_PARTITION_PRUNING_MAX_DATA_SIZE)) {
Operator<?> child = event;
Operator<?> curr = event;
while (curr.getChildOperators().size() <= 1) {
child = curr;
curr = curr.getParentOperators().get(0);
}
// at this point we've found the fork in the op pipeline that has the
// pruning as a child plan.
LOG.info("Disabling dynamic pruning for: "
+ ((DynamicPruningEventDesc) desc).getTableScan().getName()
+ ". Expected data size is too big: " + desc.getStatistics().getDataSize());
curr.removeChild(child);
}
return false;
}
}