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 final Configuration configuration;
  29     private final String followerId;
  30     private final Logger LOG = LoggerFactory.getLogger(DummyShard.class);
  31     private long lastMessageIndex  = -1;
  32     private long lastMessageSize = 0;
  33     private Stopwatch appendEntriesWatch;
  34
  35     public DummyShard(Configuration configuration, String followerId) {
  36         this.configuration = configuration;
  37         this.followerId = followerId;
  38         LOG.info("Creating : {}", followerId);
  39     }
  40
  41     @Override
  42     public void onReceive(Object o) throws Exception {
  43         if(o instanceof RequestVote){
  44             RequestVote req = (RequestVote) o;
  45             sender().tell(new RequestVoteReply(req.getTerm(), true), self());
  46         } else if(o instanceof AppendEntries) {
  47             handleAppendEntries((AppendEntries)o);
  48         } else if(InstallSnapshot.isSerializedType(o)) {
  49             InstallSnapshot req = InstallSnapshot.fromSerializable(o);
  50             handleInstallSnapshot(req);
  51         } else if(o instanceof InstallSnapshot){
  52             handleInstallSnapshot((InstallSnapshot) o);
  53         } else {
  54             LOG.error("Unknown message : {}", o.getClass());
  55         }
  56     }
  57
  58     private void handleInstallSnapshot(InstallSnapshot req) {
  59         sender().tell(new InstallSnapshotReply(req.getTerm(), followerId, req.getChunkIndex(), true), self());
  60     }
  61
  62     protected void handleAppendEntries(AppendEntries req) throws InterruptedException {
  63         LOG.info("{} - Received AppendEntries message : leader term = {}, index = {}, prevLogIndex = {}, size = {}",
  64                 followerId, req.getTerm(),req.getLeaderCommit(), req.getPrevLogIndex(), req.getEntries().size());
  65
  66         if(appendEntriesWatch != null){
  67             long elapsed = appendEntriesWatch.elapsed(TimeUnit.SECONDS);
  68             if(elapsed >= 5){
  69                 LOG.error("More than 5 seconds since last append entry, elapsed Time = {} seconds" +
  70                                 ", leaderCommit = {}, prevLogIndex = {}, size = {}",
  71                         elapsed, req.getLeaderCommit(), req.getPrevLogIndex(), req.getEntries().size());
  72             }
  73             appendEntriesWatch.reset().start();
  74         } else {
  75             appendEntriesWatch = Stopwatch.createStarted();
  76         }
  77
  78         if(lastMessageIndex == req.getLeaderCommit() && req.getEntries().size() > 0 && lastMessageSize > 0){
  79             LOG.error("{} - Duplicate message with leaderCommit = {} prevLogIndex = {} received", followerId, req.getLeaderCommit(), req.getPrevLogIndex());
  80         }
  81
  82         lastMessageIndex = req.getLeaderCommit();
  83         lastMessageSize = req.getEntries().size();
  84
  85         long lastIndex = req.getLeaderCommit();
  86         if (req.getEntries().size() > 0) {
  87             for(ReplicatedLogEntry entry : req.getEntries()) {
  88                 lastIndex = entry.getIndex();
  89             }
  90         }
  91
  92         if (configuration.shouldCauseTrouble() && req.getEntries().size() > 0) {
  93             boolean ignore = false;
  94
  95             if (configuration.shouldDropReplies()) {
  96                 ignore = Math.random() > 0.5;
  97             }
  98
  99             long delay = (long) (Math.random() * configuration.getMaxDelayInMillis());
 100
 101             if (!ignore) {
 102                 LOG.info("{} - Randomizing delay : {}", followerId, delay);
 103                 Thread.sleep(delay);
 104                 sender().tell(new AppendEntriesReply(followerId, req.getTerm(), true, lastIndex, req.getTerm(),
 105                         DataStoreVersions.CURRENT_VERSION), self());
 106             }
 107         } else {
 108             sender().tell(new AppendEntriesReply(followerId, req.getTerm(), true, lastIndex, req.getTerm(),
 109                     DataStoreVersions.CURRENT_VERSION), self());
 110         }
 111     }
 112
 113     public static Props props(Configuration configuration, final String followerId) {
 114
 115         return Props.create(new DummyShardCreator(configuration, followerId));
 116     }
 117
 118     private static class DummyShardCreator implements Creator<DummyShard> {
 119
 120         private static final long serialVersionUID = 1L;
 121         private final Configuration configuration;
 122         private final String followerId;
 123
 124         DummyShardCreator(Configuration configuration, String followerId) {
 125             this.configuration = configuration;
 126             this.followerId = followerId;
 127         }
 128
 129         @Override
 130         public DummyShard create() throws Exception {
 131             return new DummyShard(configuration, followerId);
 132         }
 133     }
 134
 135 }