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* Licensed to the Apache Software Foundation (ASF) under one
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* 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
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* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
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package org.apache.flume.channel.file;
import com.google.common.base.Charsets;
import org.apache.flume.Transaction;
import org.apache.flume.event.EventBuilder;
import org.apache.flume.sink.LoggerSink;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Collections;
import java.util.Set;
import static org.apache.flume.channel.file.TestUtils.compareInputAndOut;
import static org.apache.flume.channel.file.TestUtils.putEvents;
import static org.apache.flume.channel.file.TestUtils.takeEvents;
public class TestFileChannelRollback extends TestFileChannelBase {
protected static final Logger LOG = LoggerFactory
.getLogger(TestFileChannelRollback.class);
@Before
public void setup() throws Exception {
super.setup();
}
@After
public void teardown() {
super.teardown();
}
@Test
public void testRollbackAfterNoPutTake() throws Exception {
channel.start();
Assert.assertTrue(channel.isOpen());
Transaction transaction;
transaction = channel.getTransaction();
transaction.begin();
transaction.rollback();
transaction.close();
// ensure we can reopen log with no error
channel.stop();
channel = createFileChannel();
channel.start();
Assert.assertTrue(channel.isOpen());
transaction = channel.getTransaction();
transaction.begin();
Assert.assertNull(channel.take());
transaction.commit();
transaction.close();
}
@Test
public void testRollbackSimulatedCrash() throws Exception {
channel.start();
Assert.assertTrue(channel.isOpen());
int numEvents = 50;
Set<String> in = putEvents(channel, "rollback", 1, numEvents);
Transaction transaction;
// put an item we will rollback
transaction = channel.getTransaction();
transaction.begin();
channel.put(EventBuilder.withBody("rolled back".getBytes(Charsets.UTF_8)));
transaction.rollback();
transaction.close();
// simulate crash
channel.stop();
channel = createFileChannel();
channel.start();
Assert.assertTrue(channel.isOpen());
// we should not get the rolled back item
Set<String> out = takeEvents(channel, 1, numEvents);
compareInputAndOut(in, out);
}
@Test
public void testRollbackSimulatedCrashWithSink() throws Exception {
channel.start();
Assert.assertTrue(channel.isOpen());
int numEvents = 100;
LoggerSink sink = new LoggerSink();
sink.setChannel(channel);
// sink will leave one item
CountingSinkRunner runner = new CountingSinkRunner(sink, numEvents - 1);
runner.start();
putEvents(channel, "rollback", 10, numEvents);
Transaction transaction;
// put an item we will rollback
transaction = channel.getTransaction();
transaction.begin();
byte[] bytes = "rolled back".getBytes(Charsets.UTF_8);
channel.put(EventBuilder.withBody(bytes));
transaction.rollback();
transaction.close();
while (runner.isAlive()) {
Thread.sleep(10L);
}
Assert.assertEquals(numEvents - 1, runner.getCount());
for (Exception ex : runner.getErrors()) {
LOG.warn("Sink had error", ex);
}
Assert.assertEquals(Collections.EMPTY_LIST, runner.getErrors());
// simulate crash
channel.stop();
channel = createFileChannel();
channel.start();
Assert.assertTrue(channel.isOpen());
Set<String> out = takeEvents(channel, 1, 1);
Assert.assertEquals(1, out.size());
String s = out.iterator().next();
Assert.assertTrue(s, s.startsWith("rollback-90-9"));
}
}