Examples with LogAppender org.apache.ratis.server.leader.LogAppender used on opensource projects

Example 1 with LogAppender

use of org.apache.ratis.server.leader.LogAppender in project incubator-ratis by apache.

the class LeaderStateImpl method addSenders.

Collection<LogAppender> addSenders(Collection<RaftPeer> newPeers, long nextIndex, boolean attendVote) {
    final Timestamp t = Timestamp.currentTime().addTimeMs(-server.getMaxTimeoutMs());
    final List<LogAppender> newAppenders = newPeers.stream().map(peer -> {
        final FollowerInfo f = new FollowerInfoImpl(server.getMemberId(), peer, t, nextIndex, attendVote);
        LogAppender logAppender = server.newLogAppender(this, f);
        peerIdFollowerInfoMap.put(peer.getId(), f);
        raftServerMetrics.addFollower(peer.getId());
        logAppenderMetrics.addFollowerGauges(peer.getId(), f::getNextIndex, f::getMatchIndex, f::getLastRpcTime);
        return logAppender;
    }).collect(Collectors.toList());
    senders.addAll(newAppenders);
    return newAppenders;
}

Example 2 with LogAppender

use of org.apache.ratis.server.leader.LogAppender in project incubator-ratis by apache.

the class LeaderStateImpl method updateFollowerCommitInfos.

void updateFollowerCommitInfos(CommitInfoCache cache, List<CommitInfoProto> protos) {
    for (LogAppender sender : senders.getSenders()) {
        FollowerInfo info = sender.getFollower();
        protos.add(cache.update(info.getPeer(), info.getCommitIndex()));
    }
}

Example 3 with LogAppender

use of org.apache.ratis.server.leader.LogAppender in project incubator-ratis by apache.

the class LeaderStateImpl method start.

LogEntryProto start() {
    // In the beginning of the new term, replicate a conf entry in order
    // to finally commit entries in the previous term.
    // Also this message can help identify the last committed index and the conf.
    final LogEntryProto placeHolder = LogProtoUtils.toLogEntryProto(server.getRaftConf(), server.getState().getCurrentTerm(), raftLog.getNextIndex());
    CodeInjectionForTesting.execute(APPEND_PLACEHOLDER, server.getId().toString(), null);
    raftLog.append(placeHolder);
    processor.start();
    senders.forEach(LogAppender::start);
    return placeHolder;
}

Example 4 with LogAppender

use of org.apache.ratis.server.leader.LogAppender in project incubator-ratis by apache.

the class LeaderStateImpl method yieldLeaderToHigherPriorityPeer.

private void yieldLeaderToHigherPriorityPeer() {
    if (!server.getInfo().isLeader()) {
        return;
    }
    final RaftConfigurationImpl conf = server.getRaftConf();
    final RaftPeer leader = conf.getPeer(server.getId());
    if (leader == null) {
        LOG.error("{} the leader {} is not in the conf {}", this, server.getId(), conf);
        return;
    }
    int leaderPriority = leader.getPriority();
    for (LogAppender logAppender : senders.getSenders()) {
        final FollowerInfo followerInfo = logAppender.getFollower();
        final RaftPeerId followerID = followerInfo.getPeer().getId();
        final RaftPeer follower = conf.getPeer(followerID);
        if (follower == null) {
            LOG.error("{} the follower {} is not in the conf {}", this, server.getId(), conf);
            continue;
        }
        final int followerPriority = follower.getPriority();
        if (followerPriority <= leaderPriority) {
            continue;
        }
        final TermIndex leaderLastEntry = server.getState().getLastEntry();
        if (leaderLastEntry == null) {
            LOG.info("{} send StartLeaderElectionRequest to follower:{} on term:{} because follower's priority:{} " + "is higher than leader's:{} and leader's lastEntry is null", this, followerID, currentTerm, followerPriority, leaderPriority);
            sendStartLeaderElectionToHigherPriorityPeer(followerID, null);
            return;
        }
        if (followerInfo.getMatchIndex() >= leaderLastEntry.getIndex()) {
            LOG.info("{} send StartLeaderElectionRequest to follower:{} on term:{} because follower's priority:{} " + "is higher than leader's:{} and follower's lastEntry index:{} catch up with leader's:{}", this, followerID, currentTerm, followerPriority, leaderPriority, followerInfo.getMatchIndex(), leaderLastEntry.getIndex());
            sendStartLeaderElectionToHigherPriorityPeer(followerID, leaderLastEntry);
            return;
        }
    }
}

Example 5 with LogAppender

use of org.apache.ratis.server.leader.LogAppender in project incubator-ratis by apache.

the class LeaderStateImpl method stop.

void stop() {
    this.running = false;
    // do not interrupt event processor since it may be in the middle of logSync
    senders.forEach(LogAppender::stop);
    final NotLeaderException nle = server.generateNotLeaderException();
    final Collection<CommitInfoProto> commitInfos = server.getCommitInfos();
    try {
        final Collection<TransactionContext> transactions = pendingRequests.sendNotLeaderResponses(nle, commitInfos);
        server.getStateMachine().leaderEvent().notifyNotLeader(transactions);
        watchRequests.failWatches(nle);
    } catch (IOException e) {
        LOG.warn("{}: Caught exception in sendNotLeaderResponses", this, e);
    }
    messageStreamRequests.clear();
    server.getServerRpc().notifyNotLeader(server.getMemberId().getGroupId());
    logAppenderMetrics.unregister();
    raftServerMetrics.unregister();
    pendingRequests.close();
}