/*
* 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.cassandra.service;
import java.net.InetAddress;
import java.util.List;
import java.util.concurrent.TimeUnit;
import com.google.common.collect.ImmutableList;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;
import org.apache.cassandra.SchemaLoader;
import org.apache.cassandra.Util;
import org.apache.cassandra.db.ColumnFamilyStore;
import org.apache.cassandra.db.ConsistencyLevel;
import org.apache.cassandra.db.Keyspace;
import org.apache.cassandra.db.SinglePartitionReadCommand;
import org.apache.cassandra.exceptions.ReadFailureException;
import org.apache.cassandra.exceptions.ReadTimeoutException;
import org.apache.cassandra.exceptions.RequestFailureReason;
import org.apache.cassandra.net.MessageOut;
import org.apache.cassandra.net.MessagingService;
import org.apache.cassandra.schema.KeyspaceParams;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.fail;
public class ReadExecutorTest
{
static Keyspace ks;
static ColumnFamilyStore cfs;
static List<InetAddress> targets;
@BeforeClass
public static void setUpClass() throws Throwable
{
SchemaLoader.loadSchema();
SchemaLoader.createKeyspace("Foo", KeyspaceParams.simple(3), SchemaLoader.standardCFMD("Foo", "Bar"));
ks = Keyspace.open("Foo");
cfs = ks.getColumnFamilyStore("Bar");
targets = ImmutableList.of(InetAddress.getByName("127.0.0.255"), InetAddress.getByName("127.0.0.254"), InetAddress.getByName("127.0.0.253"));
cfs.sampleLatencyNanos = 0;
}
@Before
public void resetCounters() throws Throwable
{
cfs.metric.speculativeInsufficientReplicas.dec(cfs.metric.speculativeInsufficientReplicas.getCount());
cfs.metric.speculativeRetries.dec(cfs.metric.speculativeRetries.getCount());
cfs.metric.speculativeFailedRetries.dec(cfs.metric.speculativeFailedRetries.getCount());
}
/**
* If speculation would have been beneficial but could not be attempted due to lack of replicas
* count that it occured
*/
@Test
public void testUnableToSpeculate() throws Throwable
{
assertEquals(0, cfs.metric.speculativeInsufficientReplicas.getCount());
assertEquals(0, ks.metric.speculativeInsufficientReplicas.getCount());
AbstractReadExecutor executor = new AbstractReadExecutor.NeverSpeculatingReadExecutor(ks, cfs, new MockSinglePartitionReadCommand(), ConsistencyLevel.LOCAL_QUORUM, targets, System.nanoTime(), true);
executor.maybeTryAdditionalReplicas();
try
{
executor.get();
fail();
}
catch (ReadTimeoutException e)
{
//expected
}
assertEquals(1, cfs.metric.speculativeInsufficientReplicas.getCount());
assertEquals(1, ks.metric.speculativeInsufficientReplicas.getCount());
//Shouldn't increment
executor = new AbstractReadExecutor.NeverSpeculatingReadExecutor(ks, cfs, new MockSinglePartitionReadCommand(), ConsistencyLevel.LOCAL_QUORUM, targets, System.nanoTime(), false);
executor.maybeTryAdditionalReplicas();
try
{
executor.get();
fail();
}
catch (ReadTimeoutException e)
{
//expected
}
assertEquals(1, cfs.metric.speculativeInsufficientReplicas.getCount());
assertEquals(1, ks.metric.speculativeInsufficientReplicas.getCount());
}
/**
* Test that speculation when it is attempted is countedc, and when it succeed
* no failure is counted.
*/
@Test
public void testSpeculateSucceeded() throws Throwable
{
assertEquals(0, cfs.metric.speculativeRetries.getCount());
assertEquals(0, cfs.metric.speculativeFailedRetries.getCount());
assertEquals(0, ks.metric.speculativeRetries.getCount());
assertEquals(0, ks.metric.speculativeFailedRetries.getCount());
AbstractReadExecutor executor = new AbstractReadExecutor.SpeculatingReadExecutor(ks, cfs, new MockSinglePartitionReadCommand(TimeUnit.DAYS.toMillis(365)), ConsistencyLevel.LOCAL_QUORUM, targets, System.nanoTime());
executor.maybeTryAdditionalReplicas();
new Thread()
{
@Override
public void run()
{
//Failures end the read promptly but don't require mock data to be suppleid
executor.handler.onFailure(targets.get(0), RequestFailureReason.READ_TOO_MANY_TOMBSTONES);
executor.handler.onFailure(targets.get(1), RequestFailureReason.READ_TOO_MANY_TOMBSTONES);
executor.handler.condition.signalAll();
}
}.start();
try
{
executor.get();
fail();
}
catch (ReadFailureException e)
{
//expected
}
assertEquals(1, cfs.metric.speculativeRetries.getCount());
assertEquals(0, cfs.metric.speculativeFailedRetries.getCount());
assertEquals(1, ks.metric.speculativeRetries.getCount());
assertEquals(0, ks.metric.speculativeFailedRetries.getCount());
}
/**
* Test that speculation failure statistics are incremented if speculation occurs
* and the read still times out.
*/
@Test
public void testSpeculateFailed() throws Throwable
{
assertEquals(0, cfs.metric.speculativeRetries.getCount());
assertEquals(0, cfs.metric.speculativeFailedRetries.getCount());
assertEquals(0, ks.metric.speculativeRetries.getCount());
assertEquals(0, ks.metric.speculativeFailedRetries.getCount());
AbstractReadExecutor executor = new AbstractReadExecutor.SpeculatingReadExecutor(ks, cfs, new MockSinglePartitionReadCommand(), ConsistencyLevel.LOCAL_QUORUM, targets, System.nanoTime());
executor.maybeTryAdditionalReplicas();
try
{
executor.get();
fail();
}
catch (ReadTimeoutException e)
{
//expected
}
assertEquals(1, cfs.metric.speculativeRetries.getCount());
assertEquals(1, cfs.metric.speculativeFailedRetries.getCount());
assertEquals(1, ks.metric.speculativeRetries.getCount());
assertEquals(1, ks.metric.speculativeFailedRetries.getCount());
}
public static class MockSinglePartitionReadCommand extends SinglePartitionReadCommand
{
private final long timeout;
MockSinglePartitionReadCommand()
{
this(0);
}
MockSinglePartitionReadCommand(long timeout)
{
super(false, 0, cfs.metadata(), 0, null, null, null, Util.dk("ry@n_luvs_teh_y@nk33z"), null);
this.timeout = timeout;
}
@Override
public long getTimeout()
{
return timeout;
}
@Override
public MessageOut createMessage()
{
return new MessageOut(MessagingService.Verb.BATCH_REMOVE)
{
@Override
public int serializedSize(int version)
{
return 0;
}
};
}
}
}