/**
* 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.core;
import java.io.IOException;
import org.junit.Assert;
import org.junit.Test;
import com.cloudera.flume.handlers.debug.IntervalFlakeyEventSink;
import com.cloudera.flume.reporter.aggregator.CounterSink;
/**
* This tests the failover pipe mechanism. The semantics of this is that it
* attempts to write to the primary, and if it failes with an exception, it
* fails over to the secondary. If the secondary fails as well, an exception is
* thrown.
*/
public class TestFailOverSink {
@Test
public void testFailOverSink() throws IOException, InterruptedException {
CounterSink primary = new CounterSink("primary");
CounterSink secondary = new CounterSink("backup");
IntervalFlakeyEventSink<EventSink> flake = new IntervalFlakeyEventSink<EventSink>(
primary, 2);
FailOverSink failsink = new FailOverSink(flake, secondary);
failsink.open();
for (int i = 0; i < 100; i++) {
Event e = new EventImpl(("event " + i).getBytes());
failsink.append(e);
}
// this should succeed, with the counts being equal in primary and
// secondary.
failsink.close();
Assert.assertEquals(primary.getCount(), secondary.getCount());
}
/**
* This does multiple levels of failover.
*
* @throws InterruptedException
*/
@Test
public void testMultiFailOverSink() throws IOException, InterruptedException {
CounterSink primary = new CounterSink("primary");
CounterSink secondary = new CounterSink("backup");
CounterSink tertiary = new CounterSink("tertiary");
IntervalFlakeyEventSink<EventSink> flake1 = new IntervalFlakeyEventSink<EventSink>(
primary, 2);
IntervalFlakeyEventSink<EventSink> flake2 = new IntervalFlakeyEventSink<EventSink>(
secondary, 2);
FailOverSink failsink0 = new FailOverSink(flake2, tertiary);
FailOverSink failsink = new FailOverSink(flake1, failsink0);
failsink.open();
for (int i = 0; i < 100; i++) {
Event e = new EventImpl(("event " + i).getBytes());
failsink.append(e);
}
// this should succeed, with the counts being equal in primary and
// secondary, and tertiary.
failsink.close();
Assert.assertEquals(50, primary.getCount());
Assert.assertEquals(25, secondary.getCount());
Assert.assertEquals(25, tertiary.getCount());
}
}