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org.apache.hive.service.cli.operation.HiveCommandOperation Maven / Gradle / Ivy
/**
* 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.hive.service.cli.operation;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.PrintStream;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import org.apache.commons.lang3.CharEncoding;
import org.apache.hadoop.hive.metastore.api.Schema;
import org.apache.hadoop.hive.ql.processors.CommandProcessor;
import org.apache.hadoop.hive.ql.processors.CommandProcessorResponse;
import org.apache.hadoop.hive.ql.session.OperationLog;
import org.apache.hadoop.hive.ql.session.OperationLog.LoggingLevel;
import org.apache.hadoop.hive.ql.session.SessionState;
import org.apache.hive.service.ServiceUtils;
import org.apache.hive.service.cli.FetchOrientation;
import org.apache.hive.service.cli.HiveSQLException;
import org.apache.hive.service.cli.OperationState;
import org.apache.hive.service.cli.RowSet;
import org.apache.hive.service.cli.RowSetFactory;
import org.apache.hive.service.cli.TableSchema;
import org.apache.hive.service.cli.session.HiveSession;
/**
* Executes a HiveCommand
*/
public class HiveCommandOperation extends ExecuteStatementOperation {
private final CommandProcessor commandProcessor;
private TableSchema resultSchema = null;
private boolean closeSessionStreams = true; // Only close file based streams, not System.out and System.err.
/**
* For processors other than Hive queries (Driver), they output to session.out (a temp file)
* first and the fetchOne/fetchN/fetchAll functions get the output from pipeIn.
*/
private BufferedReader resultReader;
protected HiveCommandOperation(HiveSession parentSession, String statement,
CommandProcessor commandProcessor, Map confOverlay) {
super(parentSession, statement, confOverlay, false);
this.commandProcessor = commandProcessor;
setupSessionIO(parentSession.getSessionState());
}
private void setupSessionIO(SessionState sessionState) {
try {
LOG.info("Putting temp output to file " + sessionState.getTmpOutputFile().toString()
+ " and error output to file " + sessionState.getTmpErrOutputFile().toString());
sessionState.in = null; // hive server's session input stream is not used
// open a per-session file in auto-flush mode for writing temp results and tmp error output
sessionState.out =
new PrintStream(new FileOutputStream(sessionState.getTmpOutputFile()), true, CharEncoding.UTF_8);
sessionState.err =
new PrintStream(new FileOutputStream(sessionState.getTmpErrOutputFile()), true,CharEncoding.UTF_8);
} catch (IOException e) {
LOG.error("Error in creating temp output file ", e);
// Close file streams to avoid resource leaking
ServiceUtils.cleanup(LOG, parentSession.getSessionState().out, parentSession.getSessionState().err);
closeSessionStreams = false;
try {
sessionState.in = null;
sessionState.out = new PrintStream(System.out, true, CharEncoding.UTF_8);
sessionState.err = new PrintStream(System.err, true, CharEncoding.UTF_8);
} catch (UnsupportedEncodingException ee) {
LOG.error("Error creating PrintStream", e);
ee.printStackTrace();
sessionState.out = null;
sessionState.err = null;
}
}
}
private void tearDownSessionIO() {
if (closeSessionStreams) {
ServiceUtils.cleanup(LOG, parentSession.getSessionState().out, parentSession.getSessionState().err);
}
}
@Override
public void runInternal() throws HiveSQLException {
setState(OperationState.RUNNING);
try {
String command = getStatement().trim();
String[] tokens = statement.split("\\s");
String commandArgs = command.substring(tokens[0].length()).trim();
CommandProcessorResponse response = commandProcessor.run(commandArgs);
int returnCode = response.getResponseCode();
if (returnCode != 0) {
throw toSQLException("Error while processing statement", response);
}
Schema schema = response.getSchema();
if (schema != null) {
setHasResultSet(true);
resultSchema = new TableSchema(schema);
} else {
setHasResultSet(false);
resultSchema = new TableSchema();
}
if (response.getConsoleMessages() != null) {
// Propagate processor messages (if any) to beeline or other client.
OperationLog ol = OperationLog.getCurrentOperationLog();
if (ol != null) {
for (String consoleMsg : response.getConsoleMessages()) {
ol.writeOperationLog(LoggingLevel.EXECUTION, consoleMsg + "\n");
}
}
}
} catch (HiveSQLException e) {
setState(OperationState.ERROR);
throw e;
} catch (Exception e) {
setState(OperationState.ERROR);
throw new HiveSQLException("Error running query: " + e.toString(), e);
}
setState(OperationState.FINISHED);
}
/* (non-Javadoc)
* @see org.apache.hive.service.cli.operation.Operation#close()
*/
@Override
public void close() throws HiveSQLException {
setState(OperationState.CLOSED);
tearDownSessionIO();
cleanTmpFile();
cleanupOperationLog();
}
/* (non-Javadoc)
* @see org.apache.hive.service.cli.operation.Operation#getResultSetSchema()
*/
@Override
public TableSchema getResultSetSchema() throws HiveSQLException {
return resultSchema;
}
/* (non-Javadoc)
* @see org.apache.hive.service.cli.operation.Operation#getNextRowSet(org.apache.hive.service.cli.FetchOrientation, long)
*/
@Override
public RowSet getNextRowSet(FetchOrientation orientation, long maxRows) throws HiveSQLException {
validateDefaultFetchOrientation(orientation);
if (orientation.equals(FetchOrientation.FETCH_FIRST)) {
resetResultReader();
}
List rows = readResults((int) maxRows);
RowSet rowSet = RowSetFactory.create(resultSchema, getProtocolVersion(), false);
for (String row : rows) {
rowSet.addRow(new String[] { row });
}
return rowSet;
}
/**
* Reads the temporary results for non-Hive (non-Driver) commands to the
* resulting List of strings.
* @param nLines number of lines read at once. If it is <= 0, then read all lines.
*/
private List readResults(int nLines) throws HiveSQLException {
if (resultReader == null) {
SessionState sessionState = getParentSession().getSessionState();
File tmp = sessionState.getTmpOutputFile();
try {
resultReader = new BufferedReader(new FileReader(tmp));
} catch (FileNotFoundException e) {
LOG.error("File " + tmp + " not found. ", e);
throw new HiveSQLException(e);
}
}
List results = new ArrayList();
for (int i = 0; i < nLines || nLines <= 0; ++i) {
try {
String line = resultReader.readLine();
if (line == null) {
// reached the end of the result file
break;
} else {
results.add(line);
}
} catch (IOException e) {
LOG.error("Reading temp results encountered an exception: ", e);
throw new HiveSQLException(e);
}
}
return results;
}
private void cleanTmpFile() {
resetResultReader();
SessionState sessionState = getParentSession().getSessionState();
sessionState.deleteTmpOutputFile();
sessionState.deleteTmpErrOutputFile();
}
private void resetResultReader() {
if (resultReader != null) {
ServiceUtils.cleanup(LOG, resultReader);
resultReader = null;
}
}
@Override
public void cancel(OperationState stateAfterCancel) throws HiveSQLException {
throw new UnsupportedOperationException("HiveCommandOperation.cancel()");
}
}
