/**
* 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.metastore;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.util.concurrent.TimeUnit;
import javax.jdo.JDOException;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hadoop.hive.metastore.api.MetaException;
import org.junit.BeforeClass;
import org.junit.Test;
import org.mockito.Mockito;
public class TestRetriesInRetryingHMSHandler {
private static HiveConf hiveConf;
private static final int RETRY_ATTEMPTS = 3;
@BeforeClass
public static void setup() throws IOException {
hiveConf = new HiveConf();
int port = MetaStoreUtils.findFreePort();
hiveConf.setVar(HiveConf.ConfVars.METASTOREURIS, "thrift://localhost:" + port);
hiveConf.setIntVar(HiveConf.ConfVars.METASTORETHRIFTCONNECTIONRETRIES, 3);
hiveConf.setIntVar(HiveConf.ConfVars.HMSHANDLERATTEMPTS, RETRY_ATTEMPTS);
hiveConf.setTimeVar(HiveConf.ConfVars.HMSHANDLERINTERVAL, 10, TimeUnit.MILLISECONDS);
hiveConf.setBoolVar(HiveConf.ConfVars.HMSHANDLERFORCERELOADCONF, false);
}
/*
* If the init method of HMSHandler throws exception for the first time
* while creating RetryingHMSHandler it should be retried
*/
@Test
public void testRetryInit() throws MetaException {
IHMSHandler mockBaseHandler = Mockito.mock(HiveMetaStore.HMSHandler.class);
Mockito.when(mockBaseHandler.getConf()).thenReturn(hiveConf);
Mockito
.doThrow(JDOException.class)
.doNothing()
.when(mockBaseHandler).init();
RetryingHMSHandler.getProxy(hiveConf, mockBaseHandler, false);
Mockito.verify(mockBaseHandler, Mockito.times(2)).init();
}
/*
* init method in HMSHandler should not be retried if there are no exceptions
*/
@Test
public void testNoRetryInit() throws MetaException {
IHMSHandler mockBaseHandler = Mockito.mock(HiveMetaStore.HMSHandler.class);
Mockito.when(mockBaseHandler.getConf()).thenReturn(hiveConf);
Mockito.doNothing().when(mockBaseHandler).init();
RetryingHMSHandler.getProxy(hiveConf, mockBaseHandler, false);
Mockito.verify(mockBaseHandler, Mockito.times(1)).init();
}
/*
* If the init method in HMSHandler throws exception all the times it should be retried until
* HiveConf.ConfVars.HMSHANDLERATTEMPTS is reached before giving up
*/
@Test(expected = MetaException.class)
public void testRetriesLimit() throws MetaException {
IHMSHandler mockBaseHandler = Mockito.mock(HiveMetaStore.HMSHandler.class);
Mockito.when(mockBaseHandler.getConf()).thenReturn(hiveConf);
Mockito.doThrow(JDOException.class).when(mockBaseHandler).init();
RetryingHMSHandler.getProxy(hiveConf, mockBaseHandler, false);
Mockito.verify(mockBaseHandler, Mockito.times(RETRY_ATTEMPTS)).init();
}
/*
* Test retries when InvocationException wrapped in MetaException wrapped in JDOException
* is thrown
*/
@Test
public void testWrappedMetaExceptionRetry() throws MetaException {
IHMSHandler mockBaseHandler = Mockito.mock(HiveMetaStore.HMSHandler.class);
Mockito.when(mockBaseHandler.getConf()).thenReturn(hiveConf);
//JDOException wrapped in MetaException wrapped in InvocationException
MetaException me = new MetaException("Dummy exception");
me.initCause(new JDOException());
InvocationTargetException ex = new InvocationTargetException(me);
Mockito
.doThrow(me)
.doNothing()
.when(mockBaseHandler).init();
RetryingHMSHandler.getProxy(hiveConf, mockBaseHandler, false);
Mockito.verify(mockBaseHandler, Mockito.times(2)).init();
}
}