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.UntypedAbstractActor;
  13 import com.google.common.base.Stopwatch;
  14 import java.util.concurrent.TimeUnit;
  15 import org.opendaylight.controller.cluster.datastore.DataStoreVersions;
  16 import org.opendaylight.controller.cluster.raft.ReplicatedLogEntry;
  17 import org.opendaylight.controller.cluster.raft.messages.AppendEntries;
  18 import org.opendaylight.controller.cluster.raft.messages.AppendEntriesReply;
  19 import org.opendaylight.controller.cluster.raft.messages.InstallSnapshot;
  20 import org.opendaylight.controller.cluster.raft.messages.InstallSnapshotReply;
  21 import org.opendaylight.controller.cluster.raft.messages.RequestVote;
  22 import org.opendaylight.controller.cluster.raft.messages.RequestVoteReply;
  23 import org.slf4j.Logger;
  24 import org.slf4j.LoggerFactory;
  25
  26 public class DummyShard extends UntypedAbstractActor {
  27     private static final Logger LOG = LoggerFactory.getLogger(DummyShard.class);
  28
  29     private final Configuration configuration;
  30     private final String followerId;
  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 message) throws Exception {
  43         if (message instanceof RequestVote) {
  44             RequestVote req = (RequestVote) message;
  45             sender().tell(new RequestVoteReply(req.getTerm(), true), self());
  46         } else if (message instanceof AppendEntries) {
  47             handleAppendEntries((AppendEntries) message);
  48         } else if (message instanceof InstallSnapshot) {
  49             handleInstallSnapshot((InstallSnapshot) message);
  50         } else {
  51             LOG.error("Unknown message : {}", message.getClass());
  52         }
  53     }
  54
  55     private void handleInstallSnapshot(InstallSnapshot req) {
  56         sender().tell(new InstallSnapshotReply(req.getTerm(), followerId, req.getChunkIndex(), true), self());
  57     }
  58
  59     protected void handleAppendEntries(AppendEntries req) throws InterruptedException {
  60         LOG.info("{} - Received AppendEntries message : leader term = {}, index = {}, prevLogIndex = {}, size = {}",
  61                 followerId, req.getTerm(),req.getLeaderCommit(), req.getPrevLogIndex(), req.getEntries().size());
  62
  63         if (appendEntriesWatch != null) {
  64             long elapsed = appendEntriesWatch.elapsed(TimeUnit.SECONDS);
  65             if (elapsed >= 5) {
  66                 LOG.error("More than 5 seconds since last append entry, elapsed Time = {} seconds"
  67                                 + ", leaderCommit = {}, prevLogIndex = {}, size = {}",
  68                         elapsed, req.getLeaderCommit(), req.getPrevLogIndex(), req.getEntries().size());
  69             }
  70             appendEntriesWatch.reset().start();
  71         } else {
  72             appendEntriesWatch = Stopwatch.createStarted();
  73         }
  74
  75         if (lastMessageIndex == req.getLeaderCommit() && req.getEntries().size() > 0 && lastMessageSize > 0) {
  76             LOG.error("{} - Duplicate message with leaderCommit = {} prevLogIndex = {} received", followerId,
  77                     req.getLeaderCommit(), req.getPrevLogIndex());
  78         }
  79
  80         lastMessageIndex = req.getLeaderCommit();
  81         lastMessageSize = req.getEntries().size();
  82
  83         long lastIndex = req.getLeaderCommit();
  84         if (req.getEntries().size() > 0) {
  85             for (ReplicatedLogEntry entry : req.getEntries()) {
  86                 lastIndex = entry.getIndex();
  87             }
  88         }
  89
  90         if (configuration.shouldCauseTrouble() && req.getEntries().size() > 0) {
  91             boolean ignore = false;
  92
  93             if (configuration.shouldDropReplies()) {
  94                 ignore = Math.random() > 0.5;
  95             }
  96
  97             long delay = (long) (Math.random() * configuration.getMaxDelayInMillis());
  98
  99             if (!ignore) {
 100                 LOG.info("{} - Randomizing delay : {}", followerId, delay);
 101                 Thread.sleep(delay);
 102                 sender().tell(new AppendEntriesReply(followerId, req.getTerm(), true, lastIndex, req.getTerm(),
 103                         DataStoreVersions.CURRENT_VERSION), self());
 104             }
 105         } else {
 106             sender().tell(new AppendEntriesReply(followerId, req.getTerm(), true, lastIndex, req.getTerm(),
 107                     DataStoreVersions.CURRENT_VERSION), self());
 108         }
 109     }
 110
 111     public static Props props(Configuration configuration, final String followerId) {
 112         return Props.create(DummyShard.class, configuration, followerId);
 113     }
 114 }