@VisibleForTesting
protected void restartZooKeeper(InstanceState currentInstanceState) throws Exception {
if (currentInstanceState != null) {
currentInstanceState.updateTimestampMs();
}
if (!exhibitor.getControlPanelValues().isSet(ControlPanelTypes.RESTARTS)) {
exhibitor
.getLog()
.add(ActivityLog.Type.INFO, "Restart of ZooKeeper skipped due to control panel setting");
return;
}
exhibitor.getActivityQueue().add(QueueGroups.MAIN, new KillRunningInstance(exhibitor, true));
}
public MonitorRunningInstance(Exhibitor exhibitor) {
this.exhibitor = exhibitor;
Activity activity =
new Activity() {
@Override
public void completed(boolean wasSuccessful) {
// NOP
}
@Override
public Boolean call() throws Exception {
doWork();
return true;
}
};
repeatingActivity =
new RepeatingActivity(
exhibitor.getLog(),
exhibitor.getActivityQueue(),
QueueGroups.MAIN,
activity,
exhibitor.getConfigManager().getConfig().getInt(IntConfigs.CHECK_MS));
}
@VisibleForTesting
void doWork() throws Exception {
InstanceConfig config = exhibitor.getConfigManager().getConfig();
InstanceState instanceState =
new InstanceState(
new ServerList(config.getString(StringConfigs.SERVERS_SPEC)),
new Checker(exhibitor).calculateState(),
new RestartSignificantConfig(config));
exhibitor.getConfigManager().checkRollingConfig(instanceState);
InstanceState localCurrentInstanceState = currentInstanceState.get();
if (instanceState.equals(localCurrentInstanceState)) {
if ((localCurrentInstanceState.getState() == InstanceStateTypes.DOWN)
|| (localCurrentInstanceState.getState() == InstanceStateTypes.NOT_SERVING)) {
if (!exhibitor.getConfigManager().isRolling()) {
long elapsedMs = System.currentTimeMillis() - localCurrentInstanceState.getTimestampMs();
int downInstanceRestartMs = getDownInstanceRestartMs(config);
if (elapsedMs > downInstanceRestartMs) {
exhibitor
.getLog()
.add(
ActivityLog.Type.INFO,
"Restarting down/not-serving ZooKeeper after " + elapsedMs + " ms pause");
restartZooKeeper(localCurrentInstanceState);
} else {
exhibitor
.getLog()
.add(
ActivityLog.Type.INFO,
"ZooKeeper down/not-serving waiting "
+ elapsedMs
+ " of "
+ downInstanceRestartMs
+ " ms before restarting");
}
}
}
} else {
boolean serverListChange =
(localCurrentInstanceState != null)
&& !localCurrentInstanceState.getServerList().equals(instanceState.getServerList());
boolean configChange =
(localCurrentInstanceState != null)
&& !localCurrentInstanceState
.getCurrentConfig()
.equals(instanceState.getCurrentConfig());
currentInstanceState.set(instanceState);
exhibitor
.getLog()
.add(ActivityLog.Type.INFO, "State: " + instanceState.getState().getDescription());
if (serverListChange) {
exhibitor.getLog().add(ActivityLog.Type.INFO, "Server list has changed");
restartZooKeeper(localCurrentInstanceState);
} else if (configChange) {
exhibitor
.getLog()
.add(ActivityLog.Type.INFO, "ZooKeeper related configuration has changed");
restartZooKeeper(localCurrentInstanceState);
} else {
switch (instanceState.getState()) {
case DOWN:
{
restartZooKeeper(localCurrentInstanceState);
break;
}
default:
{
// nop
break;
}
}
}
}
}