void ApplicationCluster::stop () {
if (! enabled()) {
return;
}
// change into shutdown state
ServerState::instance()->setState(ServerState::STATE_SHUTDOWN);
AgencyComm comm;
comm.sendServerState(0.0);
if (_heartbeat != 0) {
_heartbeat->stop();
}
{
AgencyCommLocker locker("Current", "WRITE");
if (locker.successful()) {
// unregister ourselves
ServerState::RoleEnum role = ServerState::instance()->getRole();
if (role == ServerState::ROLE_PRIMARY) {
comm.removeValues("Current/DBServers/" + _myId, false);
}
else if (role == ServerState::ROLE_COORDINATOR) {
comm.removeValues("Current/Coordinators/" + _myId, false);
}
// unregister ourselves
comm.removeValues("Current/ServersRegistered/" + _myId, false);
}
}
ClusterComm::cleanup();
ClusterInfo::cleanup();
AgencyComm::cleanup();
}
static void raceForClusterBootstrap() {
AgencyComm agency;
auto ci = ClusterInfo::instance();
while (true) {
AgencyCommResult result = agency.getValues("Bootstrap");
if (!result.successful()) {
// Error in communication, note that value not found is not an error
LOG_TOPIC(TRACE, Logger::STARTUP)
<< "raceForClusterBootstrap: no agency communication";
sleep(1);
continue;
}
VPackSlice value = result.slice()[0].get(
std::vector<std::string>({agency.prefix(), "Bootstrap"}));
if (value.isString()) {
// key was found and is a string
if (value.copyString().find("done") != std::string::npos) {
// all done, let's get out of here:
LOG_TOPIC(TRACE, Logger::STARTUP)
<< "raceForClusterBootstrap: bootstrap already done";
return;
}
LOG_TOPIC(DEBUG, Logger::STARTUP)
<< "raceForClusterBootstrap: somebody else does the bootstrap";
sleep(1);
continue;
}
// No value set, we try to do the bootstrap ourselves:
VPackBuilder b;
b.add(VPackValue(arangodb::ServerState::instance()->getId()));
result = agency.casValue("Bootstrap", b.slice(), false, 300, 15);
if (!result.successful()) {
LOG_TOPIC(DEBUG, Logger::STARTUP)
<< "raceForClusterBootstrap: lost race, somebody else will bootstrap";
// Cannot get foot into the door, try again later:
sleep(1);
continue;
}
// OK, we handle things now, let's see whether a DBserver is there:
auto dbservers = ci->getCurrentDBServers();
if (dbservers.size() == 0) {
LOG_TOPIC(TRACE, Logger::STARTUP)
<< "raceForClusterBootstrap: no DBservers, waiting";
agency.removeValues("Bootstrap", false);
sleep(1);
continue;
}
LOG_TOPIC(DEBUG, Logger::STARTUP)
<< "raceForClusterBootstrap: race won, we do the bootstrap";
auto vocbase = DatabaseFeature::DATABASE->systemDatabase();
V8DealerFeature::DEALER->loadJavascriptFiles(vocbase, "server/bootstrap/cluster-bootstrap.js", 0);
LOG_TOPIC(DEBUG, Logger::STARTUP)
<< "raceForClusterBootstrap: bootstrap done";
b.clear();
b.add(VPackValue(arangodb::ServerState::instance()->getId() + ": done"));
result = agency.setValue("Bootstrap", b.slice(), 0);
if (result.successful()) {
return;
}
LOG_TOPIC(TRACE, Logger::STARTUP)
<< "raceForClusterBootstrap: could not indicate success";
sleep(1);
}
}