opendaylight/md-sal/sal-dummy-distributed-datastore/src/main/java/org/opendaylight/controller/dummy/datastore/DummyShard.java

   1 /*
   2  * Copyright (c) 2014 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8
   9 package org.opendaylight.controller.dummy.datastore;
  10
  11 import akka.actor.Props;
  12 import akka.actor.UntypedActor;
  13 import akka.japi.Creator;
  14 import com.google.common.base.Stopwatch;
  15 import java.util.concurrent.TimeUnit;
  16 import org.opendaylight.controller.cluster.datastore.DataStoreVersions;
  17 import org.opendaylight.controller.cluster.raft.ReplicatedLogEntry;
  18 import org.opendaylight.controller.cluster.raft.messages.AppendEntries;
  19 import org.opendaylight.controller.cluster.raft.messages.AppendEntriesReply;
  20 import org.opendaylight.controller.cluster.raft.messages.InstallSnapshot;
  21 import org.opendaylight.controller.cluster.raft.messages.InstallSnapshotReply;
  22 import org.opendaylight.controller.cluster.raft.messages.RequestVote;
  23 import org.opendaylight.controller.cluster.raft.messages.RequestVoteReply;
  24 import org.slf4j.Logger;
  25 import org.slf4j.LoggerFactory;
  26
  27 public class DummyShard extends UntypedActor {
  28     private static final Logger LOG = LoggerFactory.getLogger(DummyShard.class);
  29
  30     private final Configuration configuration;
  31     private final String followerId;
  32     private long lastMessageIndex  = -1;
  33     private long lastMessageSize = 0;
  34     private Stopwatch appendEntriesWatch;
  35
  36     public DummyShard(Configuration configuration, String followerId) {
  37         this.configuration = configuration;
  38         this.followerId = followerId;
  39         LOG.info("Creating : {}", followerId);
  40     }
  41
  42     @Override
  43     public void onReceive(Object message) throws Exception {
  44         if (message instanceof RequestVote) {
  45             RequestVote req = (RequestVote) message;
  46             sender().tell(new RequestVoteReply(req.getTerm(), true), self());
  47         } else if (message instanceof AppendEntries) {
  48             handleAppendEntries((AppendEntries) message);
  49         } else if (message instanceof InstallSnapshot) {
  50             handleInstallSnapshot((InstallSnapshot) message);
  51         } else {
  52             LOG.error("Unknown message : {}", message.getClass());
  53         }
  54     }
  55
  56     private void handleInstallSnapshot(InstallSnapshot req) {
  57         sender().tell(new InstallSnapshotReply(req.getTerm(), followerId, req.getChunkIndex(), true), self());
  58     }
  59
  60     protected void handleAppendEntries(AppendEntries req) throws InterruptedException {
  61         LOG.info("{} - Received AppendEntries message : leader term = {}, index = {}, prevLogIndex = {}, size = {}",
  62                 followerId, req.getTerm(),req.getLeaderCommit(), req.getPrevLogIndex(), req.getEntries().size());
  63
  64         if (appendEntriesWatch != null) {
  65             long elapsed = appendEntriesWatch.elapsed(TimeUnit.SECONDS);
  66             if (elapsed >= 5) {
  67                 LOG.error("More than 5 seconds since last append entry, elapsed Time = {} seconds"
  68                                 + ", leaderCommit = {}, prevLogIndex = {}, size = {}",
  69                         elapsed, req.getLeaderCommit(), req.getPrevLogIndex(), req.getEntries().size());
  70             }
  71             appendEntriesWatch.reset().start();
  72         } else {
  73             appendEntriesWatch = Stopwatch.createStarted();
  74         }
  75
  76         if (lastMessageIndex == req.getLeaderCommit() && req.getEntries().size() > 0 && lastMessageSize > 0) {
  77             LOG.error("{} - Duplicate message with leaderCommit = {} prevLogIndex = {} received", followerId,
  78                     req.getLeaderCommit(), req.getPrevLogIndex());
  79         }
  80
  81         lastMessageIndex = req.getLeaderCommit();
  82         lastMessageSize = req.getEntries().size();
  83
  84         long lastIndex = req.getLeaderCommit();
  85         if (req.getEntries().size() > 0) {
  86             for (ReplicatedLogEntry entry : req.getEntries()) {
  87                 lastIndex = entry.getIndex();
  88             }
  89         }
  90
  91         if (configuration.shouldCauseTrouble() && req.getEntries().size() > 0) {
  92             boolean ignore = false;
  93
  94             if (configuration.shouldDropReplies()) {
  95                 ignore = Math.random() > 0.5;
  96             }
  97
  98             long delay = (long) (Math.random() * configuration.getMaxDelayInMillis());
  99
 100             if (!ignore) {
 101                 LOG.info("{} - Randomizing delay : {}", followerId, delay);
 102                 Thread.sleep(delay);
 103                 sender().tell(new AppendEntriesReply(followerId, req.getTerm(), true, lastIndex, req.getTerm(),
 104                         DataStoreVersions.CURRENT_VERSION), self());
 105             }
 106         } else {
 107             sender().tell(new AppendEntriesReply(followerId, req.getTerm(), true, lastIndex, req.getTerm(),
 108                     DataStoreVersions.CURRENT_VERSION), self());
 109         }
 110     }
 111
 112     public static Props props(Configuration configuration, final String followerId) {
 113
 114         return Props.create(new DummyShardCreator(configuration, followerId));
 115     }
 116
 117     private static class DummyShardCreator implements Creator<DummyShard> {
 118
 119         private static final long serialVersionUID = 1L;
 120         private final Configuration configuration;
 121         private final String followerId;
 122
 123         DummyShardCreator(Configuration configuration, String followerId) {
 124             this.configuration = configuration;
 125             this.followerId = followerId;
 126         }
 127
 128         @Override
 129         public DummyShard create() throws Exception {
 130             return new DummyShard(configuration, followerId);
 131         }
 132     }
 133 }