private void stopBeingLeader() {
synchronized (lock) {
try {
log.info("I am no longer the leader...");
for (String server : loadManagementPeons.keySet()) {
LoadQueuePeon peon = loadManagementPeons.remove(server);
peon.stop();
}
loadManagementPeons.clear();
serviceAnnouncer.unannounce(self);
serverInventoryView.stop();
databaseRuleManager.stop();
databaseSegmentManager.stop();
leader = false;
} catch (Exception e) {
log.makeAlert(e, "Unable to stopBeingLeader").emit();
}
}
}
private void becomeLeader() {
synchronized (lock) {
if (!started) {
return;
}
log.info("I am the leader of the coordinators, all must bow!");
try {
leader = true;
databaseSegmentManager.start();
databaseRuleManager.start();
serverInventoryView.start();
serviceAnnouncer.announce(self);
final List<Pair<? extends CoordinatorRunnable, Duration>> coordinatorRunnables =
Lists.newArrayList();
dynamicConfigs =
configManager.watch(
CoordinatorDynamicConfig.CONFIG_KEY,
CoordinatorDynamicConfig.class,
new CoordinatorDynamicConfig.Builder().build());
coordinatorRunnables.add(
Pair.of(new CoordinatorHistoricalManagerRunnable(), config.getCoordinatorPeriod()));
if (indexingServiceClient != null) {
coordinatorRunnables.add(
Pair.of(
new CoordinatorIndexingServiceRunnable(
makeIndexingServiceHelpers(
configManager.watch(
DatasourceWhitelist.CONFIG_KEY, DatasourceWhitelist.class))),
config.getCoordinatorIndexingPeriod()));
}
for (final Pair<? extends CoordinatorRunnable, Duration> coordinatorRunnable :
coordinatorRunnables) {
ScheduledExecutors.scheduleWithFixedDelay(
exec,
config.getCoordinatorStartDelay(),
coordinatorRunnable.rhs,
new Callable<ScheduledExecutors.Signal>() {
private final CoordinatorRunnable theRunnable = coordinatorRunnable.lhs;
@Override
public ScheduledExecutors.Signal call() {
if (leader) {
theRunnable.run();
}
if (leader) { // (We might no longer be coordinator)
return ScheduledExecutors.Signal.REPEAT;
} else {
return ScheduledExecutors.Signal.STOP;
}
}
});
}
} catch (Exception e) {
log.makeAlert(e, "Unable to become leader").emit();
final LeaderLatch oldLatch = createNewLeaderLatch();
Closeables.closeQuietly(oldLatch);
try {
leaderLatch.get().start();
} catch (Exception e1) {
// If an exception gets thrown out here, then the coordinator will zombie out 'cause it
// won't be looking for
// the latch anymore. I don't believe it's actually possible for an Exception to throw
// out here, but
// Curator likes to have "throws Exception" on methods so it might happen...
log.makeAlert(e1, "I am a zombie").emit();
}
}
}
}