HDFS-1804. Add a new block-volume device choosing policy that looks at free space. Contributed by Aaron T. Myers.
git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1465184 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Aaron Myers
parent
e4d027c3a2
commit
85c29d073c
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@ -330,4 +330,14 @@ public abstract class GenericTestUtils {
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" but got:\n" + output,
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Pattern.compile(pattern).matcher(output).find());
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}
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public static void assertValueNear(long expected, long actual, long allowedError) {
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assertValueWithinRange(expected - allowedError, expected + allowedError, actual);
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}
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public static void assertValueWithinRange(long expectedMin, long expectedMax,
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long actual) {
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Assert.assertTrue("Expected " + actual + " to be in range (" + expectedMin + ","
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+ expectedMax + ")", expectedMin <= actual && actual <= expectedMax);
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}
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}
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@ -6,6 +6,9 @@ Release 2.0.5-beta - UNRELEASED
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NEW FEATURES
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HDFS-1804. Add a new block-volume device choosing policy that looks at
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free space. (atm)
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IMPROVEMENTS
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HDFS-4222. NN is unresponsive and loses heartbeats from DNs when
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@ -369,6 +369,10 @@ public class DFSConfigKeys extends CommonConfigurationKeys {
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public static final String DFS_DATANODE_PLUGINS_KEY = "dfs.datanode.plugins";
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public static final String DFS_DATANODE_FSDATASET_FACTORY_KEY = "dfs.datanode.fsdataset.factory";
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public static final String DFS_DATANODE_FSDATASET_VOLUME_CHOOSING_POLICY_KEY = "dfs.datanode.fsdataset.volume.choosing.policy";
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public static final String DFS_DATANODE_FSDATASET_VOLUME_CHOOSING_BALANCED_SPACE_THRESHOLD_KEY = "dfs.datanode.available-space-volume-choosing-policy.balanced-space-threshold";
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public static final long DFS_DATANODE_FSDATASET_VOLUME_CHOOSING_BALANCED_SPACE_THRESHOLD_DEFAULT = 1024L * 1024L * 1024L * 10L; // 10 GB
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public static final String DFS_DATANODE_FSDATASET_VOLUME_CHOOSING_BALANCED_SPACE_PREFERENCE_PERCENT_KEY = "dfs.datanode.available-space-volume-choosing-policy.balanced-space-preference-percent";
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public static final float DFS_DATANODE_FSDATASET_VOLUME_CHOOSING_BALANCED_SPACE_PREFERENCE_PERCENT_DEFAULT = 0.75f;
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public static final String DFS_DATANODE_SOCKET_WRITE_TIMEOUT_KEY = "dfs.datanode.socket.write.timeout";
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public static final String DFS_DATANODE_STARTUP_KEY = "dfs.datanode.startup";
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public static final String DFS_NAMENODE_PLUGINS_KEY = "dfs.namenode.plugins";
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@ -0,0 +1,259 @@
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/**
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.hadoop.hdfs.server.datanode.fsdataset;
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import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_DATANODE_FSDATASET_VOLUME_CHOOSING_BALANCED_SPACE_THRESHOLD_DEFAULT;
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import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_DATANODE_FSDATASET_VOLUME_CHOOSING_BALANCED_SPACE_THRESHOLD_KEY;
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import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_DATANODE_FSDATASET_VOLUME_CHOOSING_BALANCED_SPACE_PREFERENCE_PERCENT_DEFAULT;
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import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_DATANODE_FSDATASET_VOLUME_CHOOSING_BALANCED_SPACE_PREFERENCE_PERCENT_KEY;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Random;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.apache.hadoop.conf.Configurable;
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import org.apache.hadoop.conf.Configuration;
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import org.apache.hadoop.util.DiskChecker.DiskOutOfSpaceException;
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/**
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* A DN volume choosing policy which takes into account the amount of free
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* space on each of the available volumes when considering where to assign a
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* new replica allocation. By default this policy prefers assigning replicas to
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* those volumes with more available free space, so as to over time balance the
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* available space of all the volumes within a DN.
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*/
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public class AvailableSpaceVolumeChoosingPolicy<V extends FsVolumeSpi>
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implements VolumeChoosingPolicy<V>, Configurable {
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private static final Log LOG = LogFactory.getLog(AvailableSpaceVolumeChoosingPolicy.class);
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private static final Random RAND = new Random();
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private long balancedSpaceThreshold = DFS_DATANODE_FSDATASET_VOLUME_CHOOSING_BALANCED_SPACE_THRESHOLD_DEFAULT;
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private float balancedPreferencePercent = DFS_DATANODE_FSDATASET_VOLUME_CHOOSING_BALANCED_SPACE_PREFERENCE_PERCENT_DEFAULT;
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@Override
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public synchronized void setConf(Configuration conf) {
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balancedSpaceThreshold = conf.getLong(
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DFS_DATANODE_FSDATASET_VOLUME_CHOOSING_BALANCED_SPACE_THRESHOLD_KEY,
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DFS_DATANODE_FSDATASET_VOLUME_CHOOSING_BALANCED_SPACE_THRESHOLD_DEFAULT);
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balancedPreferencePercent = conf.getFloat(
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DFS_DATANODE_FSDATASET_VOLUME_CHOOSING_BALANCED_SPACE_PREFERENCE_PERCENT_KEY,
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DFS_DATANODE_FSDATASET_VOLUME_CHOOSING_BALANCED_SPACE_PREFERENCE_PERCENT_DEFAULT);
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LOG.info("Available space volume choosing policy initialized: " +
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DFS_DATANODE_FSDATASET_VOLUME_CHOOSING_BALANCED_SPACE_THRESHOLD_KEY +
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" = " + balancedSpaceThreshold + ", " +
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DFS_DATANODE_FSDATASET_VOLUME_CHOOSING_BALANCED_SPACE_PREFERENCE_PERCENT_KEY +
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" = " + balancedPreferencePercent);
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}
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@Override
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public synchronized Configuration getConf() {
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// Nothing to do. Only added to fulfill the Configurable contract.
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return null;
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}
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private VolumeChoosingPolicy<V> roundRobinPolicyBalanced =
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new RoundRobinVolumeChoosingPolicy<V>();
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private VolumeChoosingPolicy<V> roundRobinPolicyHighAvailable =
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new RoundRobinVolumeChoosingPolicy<V>();
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private VolumeChoosingPolicy<V> roundRobinPolicyLowAvailable =
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new RoundRobinVolumeChoosingPolicy<V>();
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@Override
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public synchronized V chooseVolume(List<V> volumes,
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final long replicaSize) throws IOException {
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if (volumes.size() < 1) {
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throw new DiskOutOfSpaceException("No more available volumes");
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}
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AvailableSpaceVolumeList volumesWithSpaces =
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new AvailableSpaceVolumeList(volumes);
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if (volumesWithSpaces.areAllVolumesWithinFreeSpaceThreshold()) {
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// If they're actually not too far out of whack, fall back on pure round
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// robin.
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V volume = roundRobinPolicyBalanced.chooseVolume(volumes, replicaSize);
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if (LOG.isDebugEnabled()) {
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LOG.debug("All volumes are within the configured free space balance " +
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"threshold. Selecting " + volume + " for write of block size " +
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replicaSize);
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}
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return volume;
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} else {
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V volume = null;
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// If none of the volumes with low free space have enough space for the
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// replica, always try to choose a volume with a lot of free space.
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long mostAvailableAmongLowVolumes = volumesWithSpaces
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.getMostAvailableSpaceAmongVolumesWithLowAvailableSpace();
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List<V> highAvailableVolumes = extractVolumesFromPairs(
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volumesWithSpaces.getVolumesWithHighAvailableSpace());
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List<V> lowAvailableVolumes = extractVolumesFromPairs(
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volumesWithSpaces.getVolumesWithLowAvailableSpace());
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float preferencePercentScaler =
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(highAvailableVolumes.size() * balancedPreferencePercent) +
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(lowAvailableVolumes.size() * (1 - balancedPreferencePercent));
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float scaledPreferencePercent =
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(highAvailableVolumes.size() * balancedPreferencePercent) /
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preferencePercentScaler;
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if (mostAvailableAmongLowVolumes < replicaSize ||
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RAND.nextFloat() < scaledPreferencePercent) {
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volume = roundRobinPolicyHighAvailable.chooseVolume(
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highAvailableVolumes,
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replicaSize);
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if (LOG.isDebugEnabled()) {
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LOG.debug("Volumes are imbalanced. Selecting " + volume +
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" from high available space volumes for write of block size "
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+ replicaSize);
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}
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} else {
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volume = roundRobinPolicyLowAvailable.chooseVolume(
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lowAvailableVolumes,
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replicaSize);
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if (LOG.isDebugEnabled()) {
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LOG.debug("Volumes are imbalanced. Selecting " + volume +
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" from low available space volumes for write of block size "
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+ replicaSize);
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}
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}
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return volume;
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}
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}
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/**
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* Used to keep track of the list of volumes we're choosing from.
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*/
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private class AvailableSpaceVolumeList {
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private final List<AvailableSpaceVolumePair> volumes;
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public AvailableSpaceVolumeList(List<V> volumes) throws IOException {
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this.volumes = new ArrayList<AvailableSpaceVolumePair>();
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for (V volume : volumes) {
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this.volumes.add(new AvailableSpaceVolumePair(volume));
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}
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}
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/**
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* Check if the available space on all the volumes is roughly equal.
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*
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* @param volumes the volumes to check
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* @return true if all volumes' free space is within the configured threshold,
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* false otherwise.
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* @throws IOException
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* in the event of error checking amount of available space
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*/
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public boolean areAllVolumesWithinFreeSpaceThreshold() {
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long leastAvailable = Long.MAX_VALUE;
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long mostAvailable = 0;
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for (AvailableSpaceVolumePair volume : volumes) {
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leastAvailable = Math.min(leastAvailable, volume.getAvailable());
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mostAvailable = Math.max(mostAvailable, volume.getAvailable());
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}
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return (mostAvailable - leastAvailable) < balancedSpaceThreshold;
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}
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/**
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* @return the minimum amount of space available on a single volume,
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* across all volumes.
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*/
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private long getLeastAvailableSpace() {
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long leastAvailable = Long.MAX_VALUE;
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for (AvailableSpaceVolumePair volume : volumes) {
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leastAvailable = Math.min(leastAvailable, volume.getAvailable());
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}
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return leastAvailable;
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}
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/**
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* @return the maximum amount of space available across volumes with low space.
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*/
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public long getMostAvailableSpaceAmongVolumesWithLowAvailableSpace() {
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long mostAvailable = Long.MIN_VALUE;
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for (AvailableSpaceVolumePair volume : getVolumesWithLowAvailableSpace()) {
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mostAvailable = Math.max(mostAvailable, volume.getAvailable());
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}
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return mostAvailable;
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}
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/**
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* @return the list of volumes with relatively low available space.
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*/
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public List<AvailableSpaceVolumePair> getVolumesWithLowAvailableSpace() {
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long leastAvailable = getLeastAvailableSpace();
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List<AvailableSpaceVolumePair> ret = new ArrayList<AvailableSpaceVolumePair>();
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for (AvailableSpaceVolumePair volume : volumes) {
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if (volume.getAvailable() <= leastAvailable + balancedSpaceThreshold) {
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ret.add(volume);
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}
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}
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return ret;
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}
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/**
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* @return the list of volumes with a lot of available space.
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*/
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public List<AvailableSpaceVolumePair> getVolumesWithHighAvailableSpace() {
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long leastAvailable = getLeastAvailableSpace();
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List<AvailableSpaceVolumePair> ret = new ArrayList<AvailableSpaceVolumePair>();
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for (AvailableSpaceVolumePair volume : volumes) {
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if (volume.getAvailable() > leastAvailable + balancedSpaceThreshold) {
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ret.add(volume);
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}
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}
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return ret;
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}
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}
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/**
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* Used so that we only check the available space on a given volume once, at
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* the beginning of {@link AvailableSpaceVolumeChoosingPolicy#chooseVolume(List, long)}.
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*/
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private class AvailableSpaceVolumePair {
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private final V volume;
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private final long availableSpace;
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public AvailableSpaceVolumePair(V volume) throws IOException {
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this.volume = volume;
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this.availableSpace = volume.getAvailable();
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}
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public long getAvailable() {
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return availableSpace;
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}
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public V getVolume() {
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return volume;
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}
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}
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private List<V> extractVolumesFromPairs(List<AvailableSpaceVolumePair> volumes) {
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List<V> ret = new ArrayList<V>();
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for (AvailableSpaceVolumePair volume : volumes) {
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ret.add(volume.getVolume());
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}
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return ret;
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}
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}
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@ -1231,4 +1231,32 @@
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</description>
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</property>
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<property>
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<name>dfs.datanode.fsdataset.volume.choosing.balanced-space-threshold</name>
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<value>10737418240</value> <!-- 10 GB -->
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<description>
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Only used when the dfs.datanode.fsdataset.volume.choosing.policy is set to
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org.apache.hadoop.hdfs.server.datanode.fsdataset.AvailableSpaceVolumeChoosingPolicy.
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This setting controls how much DN volumes are allowed to differ in terms of
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bytes of free disk space before they are considered imbalanced. If the free
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space of all the volumes are within this range of each other, the volumes
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will be considered balanced and block assignments will be done on a pure
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round robin basis.
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</description>
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</property>
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<property>
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<name>dfs.datanode.fsdataset.volume.choosing.balanced-space-preference-percent</name>
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<value>0.75f</value>
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<description>
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Only used when the dfs.datanode.fsdataset.volume.choosing.policy is set to
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org.apache.hadoop.hdfs.server.datanode.fsdataset.AvailableSpaceVolumeChoosingPolicy.
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This setting controls what percentage of new block allocations will be sent
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to volumes with more available disk space than others. This setting should
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be in the range 0.0 - 1.0, though in practice 0.5 - 1.0, since there should
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be no reason to prefer that volumes with less available disk space receive
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more block allocations.
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</description>
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</property>
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</configuration>
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@ -0,0 +1,303 @@
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/**
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
|
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* distributed with this work for additional information
|
||||
* regarding copyright ownership. The ASF licenses this file
|
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* 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
|
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*
|
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* http://www.apache.org/licenses/LICENSE-2.0
|
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*
|
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* 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.
|
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*/
|
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package org.apache.hadoop.hdfs.server.datanode.fsdataset;
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import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_DATANODE_FSDATASET_VOLUME_CHOOSING_BALANCED_SPACE_THRESHOLD_KEY;
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import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_DATANODE_FSDATASET_VOLUME_CHOOSING_BALANCED_SPACE_PREFERENCE_PERCENT_KEY;
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import java.util.ArrayList;
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import java.util.List;
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import junit.framework.Assert;
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import org.apache.hadoop.conf.Configurable;
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import org.apache.hadoop.conf.Configuration;
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import org.apache.hadoop.test.GenericTestUtils;
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import org.apache.hadoop.util.ReflectionUtils;
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import org.junit.Test;
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import org.mockito.Mockito;
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public class TestAvailableSpaceVolumeChoosingPolicy {
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private static final int RANDOMIZED_ITERATIONS = 10000;
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private static final float RANDOMIZED_ERROR_PERCENT = 0.05f;
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private static final long RANDOMIZED_ALLOWED_ERROR = (long) (RANDOMIZED_ERROR_PERCENT * RANDOMIZED_ITERATIONS);
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private static void initPolicy(VolumeChoosingPolicy<FsVolumeSpi> policy,
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float preferencePercent) {
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Configuration conf = new Configuration();
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// Set the threshold to consider volumes imbalanced to 1MB
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conf.setLong(
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DFS_DATANODE_FSDATASET_VOLUME_CHOOSING_BALANCED_SPACE_THRESHOLD_KEY,
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1024 * 1024); // 1MB
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conf.setFloat(
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DFS_DATANODE_FSDATASET_VOLUME_CHOOSING_BALANCED_SPACE_PREFERENCE_PERCENT_KEY,
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preferencePercent);
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((Configurable) policy).setConf(conf);
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}
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// Test the Round-Robin block-volume fallback path when all volumes are within
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// the threshold.
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@Test(timeout=60000)
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public void testRR() throws Exception {
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@SuppressWarnings("unchecked")
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final AvailableSpaceVolumeChoosingPolicy<FsVolumeSpi> policy =
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ReflectionUtils.newInstance(AvailableSpaceVolumeChoosingPolicy.class, null);
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initPolicy(policy, 1.0f);
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TestRoundRobinVolumeChoosingPolicy.testRR(policy);
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}
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// ChooseVolume should throw DiskOutOfSpaceException
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// with volume and block sizes in exception message.
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@Test(timeout=60000)
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public void testRRPolicyExceptionMessage() throws Exception {
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final AvailableSpaceVolumeChoosingPolicy<FsVolumeSpi> policy
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= new AvailableSpaceVolumeChoosingPolicy<FsVolumeSpi>();
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initPolicy(policy, 1.0f);
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TestRoundRobinVolumeChoosingPolicy.testRRPolicyExceptionMessage(policy);
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}
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@Test(timeout=60000)
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public void testTwoUnbalancedVolumes() throws Exception {
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@SuppressWarnings("unchecked")
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final AvailableSpaceVolumeChoosingPolicy<FsVolumeSpi> policy =
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ReflectionUtils.newInstance(AvailableSpaceVolumeChoosingPolicy.class, null);
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initPolicy(policy, 1.0f);
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List<FsVolumeSpi> volumes = new ArrayList<FsVolumeSpi>();
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// First volume with 1MB free space
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||||
volumes.add(Mockito.mock(FsVolumeSpi.class));
|
||||
Mockito.when(volumes.get(0).getAvailable()).thenReturn(1024L * 1024L);
|
||||
|
||||
// Second volume with 3MB free space, which is a difference of 2MB, more
|
||||
// than the threshold of 1MB.
|
||||
volumes.add(Mockito.mock(FsVolumeSpi.class));
|
||||
Mockito.when(volumes.get(1).getAvailable()).thenReturn(1024L * 1024L * 3);
|
||||
|
||||
Assert.assertEquals(volumes.get(1), policy.chooseVolume(volumes, 100));
|
||||
Assert.assertEquals(volumes.get(1), policy.chooseVolume(volumes, 100));
|
||||
Assert.assertEquals(volumes.get(1), policy.chooseVolume(volumes, 100));
|
||||
}
|
||||
|
||||
@Test(timeout=60000)
|
||||
public void testThreeUnbalancedVolumes() throws Exception {
|
||||
@SuppressWarnings("unchecked")
|
||||
final AvailableSpaceVolumeChoosingPolicy<FsVolumeSpi> policy =
|
||||
ReflectionUtils.newInstance(AvailableSpaceVolumeChoosingPolicy.class, null);
|
||||
|
||||
List<FsVolumeSpi> volumes = new ArrayList<FsVolumeSpi>();
|
||||
|
||||
// First volume with 1MB free space
|
||||
volumes.add(Mockito.mock(FsVolumeSpi.class));
|
||||
Mockito.when(volumes.get(0).getAvailable()).thenReturn(1024L * 1024L);
|
||||
|
||||
// Second volume with 3MB free space, which is a difference of 2MB, more
|
||||
// than the threshold of 1MB.
|
||||
volumes.add(Mockito.mock(FsVolumeSpi.class));
|
||||
Mockito.when(volumes.get(1).getAvailable()).thenReturn(1024L * 1024L * 3);
|
||||
|
||||
// Third volume, again with 3MB free space.
|
||||
volumes.add(Mockito.mock(FsVolumeSpi.class));
|
||||
Mockito.when(volumes.get(2).getAvailable()).thenReturn(1024L * 1024L * 3);
|
||||
|
||||
// We should alternate assigning between the two volumes with a lot of free
|
||||
// space.
|
||||
initPolicy(policy, 1.0f);
|
||||
Assert.assertEquals(volumes.get(1), policy.chooseVolume(volumes, 100));
|
||||
Assert.assertEquals(volumes.get(2), policy.chooseVolume(volumes, 100));
|
||||
Assert.assertEquals(volumes.get(1), policy.chooseVolume(volumes, 100));
|
||||
Assert.assertEquals(volumes.get(2), policy.chooseVolume(volumes, 100));
|
||||
|
||||
// All writes should be assigned to the volume with the least free space.
|
||||
initPolicy(policy, 0.0f);
|
||||
Assert.assertEquals(volumes.get(0), policy.chooseVolume(volumes, 100));
|
||||
Assert.assertEquals(volumes.get(0), policy.chooseVolume(volumes, 100));
|
||||
Assert.assertEquals(volumes.get(0), policy.chooseVolume(volumes, 100));
|
||||
Assert.assertEquals(volumes.get(0), policy.chooseVolume(volumes, 100));
|
||||
}
|
||||
|
||||
@Test(timeout=60000)
|
||||
public void testFourUnbalancedVolumes() throws Exception {
|
||||
@SuppressWarnings("unchecked")
|
||||
final AvailableSpaceVolumeChoosingPolicy<FsVolumeSpi> policy =
|
||||
ReflectionUtils.newInstance(AvailableSpaceVolumeChoosingPolicy.class, null);
|
||||
|
||||
List<FsVolumeSpi> volumes = new ArrayList<FsVolumeSpi>();
|
||||
|
||||
// First volume with 1MB free space
|
||||
volumes.add(Mockito.mock(FsVolumeSpi.class));
|
||||
Mockito.when(volumes.get(0).getAvailable()).thenReturn(1024L * 1024L);
|
||||
|
||||
// Second volume with 1MB + 1 byte free space
|
||||
volumes.add(Mockito.mock(FsVolumeSpi.class));
|
||||
Mockito.when(volumes.get(1).getAvailable()).thenReturn(1024L * 1024L + 1);
|
||||
|
||||
// Third volume with 3MB free space, which is a difference of 2MB, more
|
||||
// than the threshold of 1MB.
|
||||
volumes.add(Mockito.mock(FsVolumeSpi.class));
|
||||
Mockito.when(volumes.get(2).getAvailable()).thenReturn(1024L * 1024L * 3);
|
||||
|
||||
// Fourth volume, again with 3MB free space.
|
||||
volumes.add(Mockito.mock(FsVolumeSpi.class));
|
||||
Mockito.when(volumes.get(3).getAvailable()).thenReturn(1024L * 1024L * 3);
|
||||
|
||||
// We should alternate assigning between the two volumes with a lot of free
|
||||
// space.
|
||||
initPolicy(policy, 1.0f);
|
||||
Assert.assertEquals(volumes.get(2), policy.chooseVolume(volumes, 100));
|
||||
Assert.assertEquals(volumes.get(3), policy.chooseVolume(volumes, 100));
|
||||
Assert.assertEquals(volumes.get(2), policy.chooseVolume(volumes, 100));
|
||||
Assert.assertEquals(volumes.get(3), policy.chooseVolume(volumes, 100));
|
||||
|
||||
// We should alternate assigning between the two volumes with less free
|
||||
// space.
|
||||
initPolicy(policy, 0.0f);
|
||||
Assert.assertEquals(volumes.get(0), policy.chooseVolume(volumes, 100));
|
||||
Assert.assertEquals(volumes.get(1), policy.chooseVolume(volumes, 100));
|
||||
Assert.assertEquals(volumes.get(0), policy.chooseVolume(volumes, 100));
|
||||
Assert.assertEquals(volumes.get(1), policy.chooseVolume(volumes, 100));
|
||||
}
|
||||
|
||||
@Test(timeout=60000)
|
||||
public void testNotEnoughSpaceOnSelectedVolume() throws Exception {
|
||||
@SuppressWarnings("unchecked")
|
||||
final AvailableSpaceVolumeChoosingPolicy<FsVolumeSpi> policy =
|
||||
ReflectionUtils.newInstance(AvailableSpaceVolumeChoosingPolicy.class, null);
|
||||
|
||||
List<FsVolumeSpi> volumes = new ArrayList<FsVolumeSpi>();
|
||||
|
||||
// First volume with 1MB free space
|
||||
volumes.add(Mockito.mock(FsVolumeSpi.class));
|
||||
Mockito.when(volumes.get(0).getAvailable()).thenReturn(1024L * 1024L);
|
||||
|
||||
// Second volume with 3MB free space, which is a difference of 2MB, more
|
||||
// than the threshold of 1MB.
|
||||
volumes.add(Mockito.mock(FsVolumeSpi.class));
|
||||
Mockito.when(volumes.get(1).getAvailable()).thenReturn(1024L * 1024L * 3);
|
||||
|
||||
// All writes should be assigned to the volume with the least free space.
|
||||
// However, if the volume with the least free space doesn't have enough
|
||||
// space to accept the replica size, and another volume does have enough
|
||||
// free space, that should be chosen instead.
|
||||
initPolicy(policy, 0.0f);
|
||||
Assert.assertEquals(volumes.get(1), policy.chooseVolume(volumes, 1024L * 1024L * 2));
|
||||
}
|
||||
|
||||
@Test(timeout=60000)
|
||||
public void testAvailableSpaceChanges() throws Exception {
|
||||
@SuppressWarnings("unchecked")
|
||||
final AvailableSpaceVolumeChoosingPolicy<FsVolumeSpi> policy =
|
||||
ReflectionUtils.newInstance(AvailableSpaceVolumeChoosingPolicy.class, null);
|
||||
initPolicy(policy, 1.0f);
|
||||
|
||||
List<FsVolumeSpi> volumes = new ArrayList<FsVolumeSpi>();
|
||||
|
||||
// First volume with 1MB free space
|
||||
volumes.add(Mockito.mock(FsVolumeSpi.class));
|
||||
Mockito.when(volumes.get(0).getAvailable()).thenReturn(1024L * 1024L);
|
||||
|
||||
// Second volume with 3MB free space, which is a difference of 2MB, more
|
||||
// than the threshold of 1MB.
|
||||
volumes.add(Mockito.mock(FsVolumeSpi.class));
|
||||
Mockito.when(volumes.get(1).getAvailable())
|
||||
.thenReturn(1024L * 1024L * 3)
|
||||
.thenReturn(1024L * 1024L * 3)
|
||||
.thenReturn(1024L * 1024L * 3)
|
||||
.thenReturn(1024L * 1024L * 1); // After the third check, return 1MB.
|
||||
|
||||
// Should still be able to get a volume for the replica even though the
|
||||
// available space on the second volume changed.
|
||||
Assert.assertEquals(volumes.get(1), policy.chooseVolume(volumes, 100));
|
||||
}
|
||||
|
||||
@Test(timeout=60000)
|
||||
public void randomizedTest1() throws Exception {
|
||||
doRandomizedTest(0.75f, 1, 1);
|
||||
}
|
||||
|
||||
@Test(timeout=60000)
|
||||
public void randomizedTest2() throws Exception {
|
||||
doRandomizedTest(0.75f, 5, 1);
|
||||
}
|
||||
|
||||
@Test(timeout=60000)
|
||||
public void randomizedTest3() throws Exception {
|
||||
doRandomizedTest(0.75f, 1, 5);
|
||||
}
|
||||
|
||||
@Test(timeout=60000)
|
||||
public void randomizedTest4() throws Exception {
|
||||
doRandomizedTest(0.90f, 5, 1);
|
||||
}
|
||||
|
||||
/*
|
||||
* Ensure that we randomly select the lesser-used volumes with appropriate
|
||||
* frequency.
|
||||
*/
|
||||
public void doRandomizedTest(float preferencePercent, int lowSpaceVolumes,
|
||||
int highSpaceVolumes) throws Exception {
|
||||
@SuppressWarnings("unchecked")
|
||||
final AvailableSpaceVolumeChoosingPolicy<FsVolumeSpi> policy =
|
||||
ReflectionUtils.newInstance(AvailableSpaceVolumeChoosingPolicy.class, null);
|
||||
|
||||
List<FsVolumeSpi> volumes = new ArrayList<FsVolumeSpi>();
|
||||
|
||||
// Volumes with 1MB free space
|
||||
for (int i = 0; i < lowSpaceVolumes; i++) {
|
||||
FsVolumeSpi volume = Mockito.mock(FsVolumeSpi.class);
|
||||
Mockito.when(volume.getAvailable()).thenReturn(1024L * 1024L);
|
||||
volumes.add(volume);
|
||||
}
|
||||
|
||||
// Volumes with 3MB free space
|
||||
for (int i = 0; i < highSpaceVolumes; i++) {
|
||||
FsVolumeSpi volume = Mockito.mock(FsVolumeSpi.class);
|
||||
Mockito.when(volume.getAvailable()).thenReturn(1024L * 1024L * 3);
|
||||
volumes.add(volume);
|
||||
}
|
||||
|
||||
initPolicy(policy, preferencePercent);
|
||||
long lowAvailableSpaceVolumeSelected = 0;
|
||||
long highAvailableSpaceVolumeSelected = 0;
|
||||
for (int i = 0; i < RANDOMIZED_ITERATIONS; i++) {
|
||||
FsVolumeSpi volume = policy.chooseVolume(volumes, 100);
|
||||
for (int j = 0; j < volumes.size(); j++) {
|
||||
// Note how many times the first low available volume was selected
|
||||
if (volume == volumes.get(j) && j == 0) {
|
||||
lowAvailableSpaceVolumeSelected++;
|
||||
}
|
||||
// Note how many times the first high available volume was selected
|
||||
if (volume == volumes.get(j) && j == lowSpaceVolumes) {
|
||||
highAvailableSpaceVolumeSelected++;
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Calculate the expected ratio of how often low available space volumes
|
||||
// were selected vs. high available space volumes.
|
||||
float expectedSelectionRatio = preferencePercent / (1 - preferencePercent);
|
||||
|
||||
GenericTestUtils.assertValueNear(
|
||||
(long)(lowAvailableSpaceVolumeSelected * expectedSelectionRatio),
|
||||
highAvailableSpaceVolumeSelected,
|
||||
RANDOMIZED_ALLOWED_ERROR);
|
||||
}
|
||||
|
||||
}
|
||||
|
|
@ -32,6 +32,14 @@ public class TestRoundRobinVolumeChoosingPolicy {
|
|||
// Test the Round-Robin block-volume choosing algorithm.
|
||||
@Test
|
||||
public void testRR() throws Exception {
|
||||
@SuppressWarnings("unchecked")
|
||||
final RoundRobinVolumeChoosingPolicy<FsVolumeSpi> policy =
|
||||
ReflectionUtils.newInstance(RoundRobinVolumeChoosingPolicy.class, null);
|
||||
testRR(policy);
|
||||
}
|
||||
|
||||
public static void testRR(VolumeChoosingPolicy<FsVolumeSpi> policy)
|
||||
throws Exception {
|
||||
final List<FsVolumeSpi> volumes = new ArrayList<FsVolumeSpi>();
|
||||
|
||||
// First volume, with 100 bytes of space.
|
||||
|
|
@ -41,10 +49,6 @@ public class TestRoundRobinVolumeChoosingPolicy {
|
|||
// Second volume, with 200 bytes of space.
|
||||
volumes.add(Mockito.mock(FsVolumeSpi.class));
|
||||
Mockito.when(volumes.get(1).getAvailable()).thenReturn(200L);
|
||||
|
||||
@SuppressWarnings("unchecked")
|
||||
final RoundRobinVolumeChoosingPolicy<FsVolumeSpi> policy =
|
||||
ReflectionUtils.newInstance(RoundRobinVolumeChoosingPolicy.class, null);
|
||||
|
||||
// Test two rounds of round-robin choosing
|
||||
Assert.assertEquals(volumes.get(0), policy.chooseVolume(volumes, 0));
|
||||
|
|
@ -69,6 +73,13 @@ public class TestRoundRobinVolumeChoosingPolicy {
|
|||
// with volume and block sizes in exception message.
|
||||
@Test
|
||||
public void testRRPolicyExceptionMessage() throws Exception {
|
||||
final RoundRobinVolumeChoosingPolicy<FsVolumeSpi> policy
|
||||
= new RoundRobinVolumeChoosingPolicy<FsVolumeSpi>();
|
||||
testRRPolicyExceptionMessage(policy);
|
||||
}
|
||||
|
||||
public static void testRRPolicyExceptionMessage(
|
||||
VolumeChoosingPolicy<FsVolumeSpi> policy) throws Exception {
|
||||
final List<FsVolumeSpi> volumes = new ArrayList<FsVolumeSpi>();
|
||||
|
||||
// First volume, with 500 bytes of space.
|
||||
|
|
@ -79,8 +90,6 @@ public class TestRoundRobinVolumeChoosingPolicy {
|
|||
volumes.add(Mockito.mock(FsVolumeSpi.class));
|
||||
Mockito.when(volumes.get(1).getAvailable()).thenReturn(600L);
|
||||
|
||||
final RoundRobinVolumeChoosingPolicy<FsVolumeSpi> policy
|
||||
= new RoundRobinVolumeChoosingPolicy<FsVolumeSpi>();
|
||||
int blockSize = 700;
|
||||
try {
|
||||
policy.chooseVolume(volumes, blockSize);
|
||||
|
|
|
|||
Loading…
Reference in New Issue