Examples with ReadOnlyOption org.apache.ignite.raft.jraft.option.ReadOnlyOption used on opensource projects

Example 1 with ReadOnlyOption

use of org.apache.ignite.raft.jraft.option.ReadOnlyOption in project ignite-3 by apache.

the class NodeImpl method readLeader.

private void readLeader(ReadIndexRequest request, RpcResponseClosure<ReadIndexResponse> closure) {
    ReadIndexResponseBuilder respBuilder = raftOptions.getRaftMessagesFactory().readIndexResponse();
    final int quorum = getQuorum();
    if (quorum <= 1) {
        // Only one peer, fast path.
        respBuilder.success(true).index(this.ballotBox.getLastCommittedIndex());
        closure.setResponse(respBuilder.build());
        closure.run(Status.OK());
        return;
    }
    final long lastCommittedIndex = this.ballotBox.getLastCommittedIndex();
    if (this.logManager.getTerm(lastCommittedIndex) != this.currTerm) {
        // Reject read only request when this leader has not committed any log entry at its term
        closure.run(new Status(RaftError.EAGAIN, "ReadIndex request rejected because leader has not committed any log entry at its term, logIndex=%d, currTerm=%d.", lastCommittedIndex, this.currTerm));
        return;
    }
    respBuilder.index(lastCommittedIndex);
    if (request.peerId() != null) {
        // request from follower or learner, check if the follower/learner is in current conf.
        final PeerId peer = new PeerId();
        peer.parse(request.serverId());
        if (!this.conf.contains(peer) && !this.conf.containsLearner(peer)) {
            closure.run(new Status(RaftError.EPERM, "Peer %s is not in current configuration: %s.", peer, this.conf));
            return;
        }
    }
    ReadOnlyOption readOnlyOpt = this.raftOptions.getReadOnlyOptions();
    if (readOnlyOpt == ReadOnlyOption.ReadOnlyLeaseBased && !isLeaderLeaseValid()) {
        // If leader lease timeout, we must change option to ReadOnlySafe
        readOnlyOpt = ReadOnlyOption.ReadOnlySafe;
    }
    switch(readOnlyOpt) {
        case ReadOnlySafe:
            final List<PeerId> peers = this.conf.getConf().getPeers();
            Requires.requireTrue(peers != null && !peers.isEmpty(), "Empty peers");
            final ReadIndexHeartbeatResponseClosure heartbeatDone = new ReadIndexHeartbeatResponseClosure(closure, respBuilder, quorum, peers.size());
            // Send heartbeat requests to followers
            for (final PeerId peer : peers) {
                if (peer.equals(this.serverId)) {
                    continue;
                }
                this.replicatorGroup.sendHeartbeat(peer, heartbeatDone);
            }
            break;
        case ReadOnlyLeaseBased:
            // Responses to followers and local node.
            respBuilder.success(true);
            closure.setResponse(respBuilder.build());
            closure.run(Status.OK());
            break;
    }
}