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

Example 1 with FollowerInfo

use of org.apache.ratis.server.leader.FollowerInfo 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 FollowerInfo

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

the class LeaderStateImpl method getFollowerInfos.

private List<FollowerInfo> getFollowerInfos(List<RaftPeerId> followerIDs) {
    List<FollowerInfo> followerInfos = new ArrayList<>();
    for (int i = 0; i < followerIDs.size(); i++) {
        RaftPeerId id = followerIDs.get(i);
        if (!peerIdFollowerInfoMap.containsKey(id)) {
            throw new IllegalArgumentException("RaftPeerId:" + id + " not in peerIdFollowerInfoMap of leader:" + server.getMemberId());
        }
        followerInfos.add(peerIdFollowerInfoMap.get(id));
    }
    return followerInfos;
}

Example 3 with FollowerInfo

use of org.apache.ratis.server.leader.FollowerInfo 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 4 with FollowerInfo

use of org.apache.ratis.server.leader.FollowerInfo 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 FollowerInfo

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

the class GrpcLogAppender method shouldNotifyToInstallSnapshot.

/**
 * Should the Leader notify the Follower to install the snapshot through
 * its own State Machine.
 * @return the first available log's start term index
 */
private TermIndex shouldNotifyToInstallSnapshot() {
    final FollowerInfo follower = getFollower();
    final long leaderNextIndex = getRaftLog().getNextIndex();
    final boolean isFollowerBootstrapping = getLeaderState().isFollowerBootstrapping(follower);
    final long leaderStartIndex = getRaftLog().getStartIndex();
    final TermIndex firstAvailable = Optional.ofNullable(getRaftLog().getTermIndex(leaderStartIndex)).orElseGet(() -> TermIndex.valueOf(getServer().getInfo().getCurrentTerm(), leaderNextIndex));
    if (isFollowerBootstrapping && !follower.hasAttemptedToInstallSnapshot()) {
        // If the follower is bootstrapping and has not yet installed any snapshot from leader, then the follower should
        // be notified to install a snapshot. Every follower should try to install at least one snapshot during
        // bootstrapping, if available.
        LOG.debug("{}: follower is bootstrapping, notify to install snapshot to {}.", this, firstAvailable);
        return firstAvailable;
    }
    final long followerNextIndex = follower.getNextIndex();
    if (followerNextIndex >= leaderNextIndex) {
        return null;
    }
    if (followerNextIndex < leaderStartIndex) {
        // State Machine.
        return firstAvailable;
    } else if (leaderStartIndex == RaftLog.INVALID_LOG_INDEX) {
        // Leader has no logs to check from, hence return next index.
        return firstAvailable;
    }
    return null;
}