/*
* Copyright © 2014 Cask Data, Inc.
*
* Licensed 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 co.cask.cdap.explore.service.hive;
import co.cask.cdap.common.conf.CConfiguration;
import co.cask.cdap.common.conf.Constants;
import co.cask.cdap.data2.dataset2.DatasetFramework;
import co.cask.cdap.explore.service.ExploreException;
import co.cask.cdap.explore.service.HandleNotFoundException;
import co.cask.cdap.proto.QueryResult;
import co.cask.cdap.proto.QueryStatus;
import co.cask.tephra.TransactionSystemClient;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Lists;
import com.google.inject.Inject;
import com.google.inject.name.Named;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hive.service.cli.FetchOrientation;
import org.apache.hive.service.cli.HiveSQLException;
import org.apache.hive.service.cli.OperationHandle;
import org.apache.hive.service.cli.OperationStatus;
import org.apache.hive.service.cli.RowSet;
import org.apache.hive.service.cli.SessionHandle;
import java.io.File;
import java.util.Collections;
import java.util.List;
/**
* Hive 13 implementation of {@link co.cask.cdap.explore.service.ExploreService}.
*/
public class Hive13ExploreService extends BaseHiveExploreService {
@Inject
public Hive13ExploreService(TransactionSystemClient txClient, DatasetFramework datasetFramework,
CConfiguration cConf, Configuration hConf, HiveConf hiveConf,
@Named(Constants.Explore.PREVIEWS_DIR_NAME) File previewsDir) {
super(txClient, datasetFramework, cConf, hConf, hiveConf, previewsDir);
// This config sets the time Hive CLI getOperationStatus method will wait for the status of
// a running query.
System.setProperty(HiveConf.ConfVars.HIVE_SERVER2_LONG_POLLING_TIMEOUT.toString(), "50");
}
@Override
protected QueryStatus fetchStatus(OperationHandle operationHandle)
throws HiveSQLException, ExploreException, HandleNotFoundException {
OperationStatus operationStatus = getCliService().getOperationStatus(operationHandle);
return new QueryStatus(QueryStatus.OpStatus.valueOf(operationStatus.getState().toString()),
operationHandle.hasResultSet());
}
@Override
protected List<QueryResult> fetchNextResults(OperationHandle operationHandle, int size)
throws HiveSQLException, ExploreException, HandleNotFoundException {
if (operationHandle.hasResultSet()) {
RowSet rowSet = getCliService().fetchResults(operationHandle, FetchOrientation.FETCH_NEXT, size);
ImmutableList.Builder<QueryResult> rowsBuilder = ImmutableList.builder();
for (Object[] objects : rowSet) {
rowsBuilder.add(new QueryResult(Lists.newArrayList(objects)));
}
return rowsBuilder.build();
} else {
return Collections.emptyList();
}
}
@Override
protected OperationHandle doExecute(SessionHandle sessionHandle, String statement)
throws HiveSQLException, ExploreException {
return getCliService().executeStatementAsync(sessionHandle, statement, ImmutableMap.<String, String>of());
}
}