/**
* Licensed to Cloudera, Inc. under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Cloudera, Inc. 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 com.cloudera.flume.agent;
import java.io.IOException;
import org.apache.thrift.TException;
import org.junit.Assert;
import org.junit.Test;
import com.cloudera.flume.conf.FlumeConfiguration;
import com.cloudera.flume.core.Event;
import com.cloudera.flume.core.EventImpl;
import com.cloudera.flume.core.EventSink;
import com.cloudera.flume.handlers.debug.ConsoleEventSink;
import com.cloudera.flume.handlers.endtoend.AckChecksumChecker;
import com.cloudera.flume.handlers.endtoend.AckChecksumInjector;
import com.cloudera.flume.handlers.endtoend.AckListener;
import com.cloudera.flume.handlers.endtoend.CollectorAckListener;
/**
* This tests the flow of messages and acks through a mock'ed out master
*/
public class TestAcks {
// check that agents properly manage a list of outstanding acks
@Test
public void testAckAgent() throws IOException, TException,
InterruptedException {
// mock master rpc interface
MockMasterRPC svr = new MockMasterRPC();
// agent side, inject ack messages
WALAckManager aac = new WALAckManager(svr, new AckListener.Empty(),
FlumeConfiguration.get().getAgentAckedRetransmit());
byte[] tag = "canned tag".getBytes();
AckChecksumInjector<EventSink> inj = new AckChecksumInjector<EventSink>(
new ConsoleEventSink(), tag, aac.getAgentAckQueuer());
// send a bunch of messages and then close out.
inj.open();
for (int i = 0; i < 10; i++) {
Event e = new EventImpl(("This is a test " + i).getBytes());
inj.append(e);
}
inj.close();
// agent should have pending stuff.
System.out.println("Agent: Pending " + aac.pending);
Assert.assertEquals(1, aac.pending.size());
// periodically trigger master check (this one doesn't change agent's state)
aac.checkAcks();
Assert.assertEquals(1, aac.pending.size());
// simulate the collector by sending "acknowledge" message to master, agent
// doesn't know about this.
String ackid = aac.pending.keys().nextElement();
svr.acknowledge(ackid);
Assert.assertEquals(1, aac.pending.size());
System.out.println("Agent: (still) pending " + aac.pending);
// agent checks and learns of new acks. agent learns that it no longer have
// to worry about this ack.
aac.checkAcks();
Assert.assertEquals(0, aac.pending.size());
System.out.println("Agent: No more pending " + aac.pending);
}
// check that collectors/receivers properly notify master of received complete
// acks.
@Test
public void testAckAgentCollector() throws IOException, TException,
InterruptedException {
// mock master rpc interface
MockMasterRPC svr = new MockMasterRPC();
// collector side, receive acks messages, checks acks, and notifies master.
AckChecksumChecker<EventSink> chk = new AckChecksumChecker<EventSink>(
new ConsoleEventSink(), new CollectorAckListener(svr));
// agent side, inject ack messages
WALAckManager aac = new WALAckManager(svr, new AckListener.Empty(),
FlumeConfiguration.get().getAgentAckedRetransmit());
byte[] tag = "canned tag".getBytes();
AckChecksumInjector<EventSink> inj = new AckChecksumInjector<EventSink>(
chk, tag, aac.getAgentAckQueuer());
// send a bunch of messages and then close out.
inj.open();
for (int i = 0; i < 10; i++) {
Event e = new EventImpl(("This is a test " + i).getBytes());
inj.append(e);
}
inj.close();
// agent should have pending stuff.
System.out.println("Agent: Pending " + aac.pending);
Assert.assertEquals(1, aac.pending.size());
// periodically trigger master check (this one doesn't change agent's state)
aac.checkAcks();
System.out.println("Agent: No more pending " + aac.pending);
Assert.assertEquals(0, aac.pending.size());
}
// error cases. Make sure things eventually make it.
}