/*
* Copyright © 2014-2015 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.data.dataset.SystemDatasetInstantiatorFactory;
import co.cask.cdap.data2.dataset2.DatasetFramework;
import co.cask.cdap.data2.transaction.stream.StreamAdmin;
import co.cask.cdap.explore.service.ExploreException;
import co.cask.cdap.explore.service.HandleNotFoundException;
import co.cask.cdap.explore.utils.ExploreTableNaming;
import co.cask.cdap.proto.QueryResult;
import co.cask.cdap.proto.QueryStatus;
import co.cask.cdap.store.NamespaceStore;
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.hive.service.cli.CLIService;
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.SessionHandle;
import org.apache.hive.service.cli.thrift.TColumnValue;
import org.apache.hive.service.cli.thrift.TRow;
import org.apache.hive.service.cli.thrift.TRowSet;
import java.io.File;
import java.lang.reflect.Method;
import java.util.List;
/**
* Hive 12 patched for CDH5 implementation of {@link co.cask.cdap.explore.service.ExploreService}.
* There is only 1 change compared to Hive 13 implementation -
* <ol>
* <li>{@link org.apache.hive.service.cli.CLIService#getOperationStatus(org.apache.hive.service.cli.OperationHandle)}
* return type has changed</li>
* </ol>
*/
public class Hive12CDH5ExploreService extends BaseHiveExploreService {
@Inject
protected Hive12CDH5ExploreService(TransactionSystemClient txClient, DatasetFramework datasetFramework,
CConfiguration cConf, Configuration hConf,
@Named(Constants.Explore.PREVIEWS_DIR_NAME) File previewsDir,
StreamAdmin streamAdmin, NamespaceStore store,
SystemDatasetInstantiatorFactory datasetInstantiatorFactory,
ExploreTableNaming tableNaming) {
super(txClient, datasetFramework, cConf, hConf, previewsDir,
streamAdmin, store, datasetInstantiatorFactory, tableNaming);
}
@Override
protected CLIService createCLIService() {
try {
return CLIService.class.getDeclaredConstructor().newInstance();
} catch (Exception e) {
throw new RuntimeException("Failed to instantiate CLIService", e);
}
}
@Override
protected List<QueryResult> doFetchNextResults(OperationHandle handle, FetchOrientation fetchOrientation,
int size) throws Exception {
Class<?> cliServiceClass = Class.forName("org.apache.hive.service.cli.CLIService");
Method fetchResultsMethod = cliServiceClass.getMethod(
"fetchResults", OperationHandle.class, FetchOrientation.class, Long.TYPE);
Object rowSet = fetchResultsMethod.invoke(getCliService(), handle, fetchOrientation, size);
ImmutableList.Builder<QueryResult> rowsBuilder = ImmutableList.builder();
Class<?> rowSetClass = Class.forName("org.apache.hive.service.cli.RowSet");
Method toTRowSetMethod = rowSetClass.getMethod("toTRowSet");
TRowSet tRowSet = (TRowSet) toTRowSetMethod.invoke(rowSet);
for (TRow tRow : tRowSet.getRows()) {
List<Object> cols = Lists.newArrayList();
for (TColumnValue tColumnValue : tRow.getColVals()) {
cols.add(tColumnToObject(tColumnValue));
}
rowsBuilder.add(new QueryResult(cols));
}
return rowsBuilder.build();
}
@Override
protected QueryStatus doFetchStatus(OperationHandle handle)
throws HiveSQLException, ExploreException, HandleNotFoundException {
OperationStatus operationStatus = getCliService().getOperationStatus(handle);
return new QueryStatus(QueryStatus.OpStatus.valueOf(operationStatus.getState().toString()),
handle.hasResultSet());
}
@Override
protected OperationHandle doExecute(SessionHandle sessionHandle, String statement)
throws HiveSQLException, ExploreException {
return getCliService().executeStatementAsync(sessionHandle, statement, ImmutableMap.<String, String>of());
}
}