从代码一眼可以看出remove前会先shutdown job和server。
注意一点，无论是shutdown还是remove ，都不会删除config节点，即job定义还在zookeeper上。
@Override
public void remove(final Optional<String> jobName, final Optional<String> serverIp) {
shutdown(jobName, serverIp);
if (jobName.isPresent() && serverIp.isPresent()) {
regCenter.remove(new JobNodePath(jobName.get()).getServerNodePath(serverIp.get()));
} else if (jobName.isPresent()) {
JobNodePath jobNodePath = new JobNodePath(jobName.get());
List<String> servers = regCenter.getChildrenKeys(jobNodePath.getServerNodePath());
for (String each : servers) {
regCenter.remove(jobNodePath.getServerNodePath(each));
}
} else if (serverIp.isPresent()) {
List<String> jobNames = regCenter.getChildrenKeys("/");
for (String each : jobNames) {
regCenter.remove(new JobNodePath(each).getServerNodePath(serverIp.get()));
}
}
}
shutdown server谁shutdown server上所有job，实现job分配迁移。
如果不存在active的job instance，会有异常抛出，代码如下：
Preconditions.checkArgument(jobName.isPresent() || serverIp.isPresent(), "At least indicate jobName or serverIp.");
由于shutdown 也会执行regCenter.remove，因此实际上remove里面regCenter.remove实际是多余和重复执行。
api只是remove zookeeper里面的node，运行节点job删除是通过如下代码实现的
class InstanceShutdownStatusJobListener extends AbstractJobListener {
@Override
protected void dataChanged(final String path, final Type eventType, final String data) {
if (!JobRegistry.getInstance().isShutdown(jobName) && !JobRegistry.getInstance().getJobScheduleController(jobName).isPaused()
&& isRemoveInstance(path, eventType) && !isReconnectedRegistryCenter()) {
schedulerFacade.shutdownInstance();
}
}
private boolean isRemoveInstance(final String path, final Type eventType) {
return instanceNode.isLocalInstancePath(path) && Type.NODE_REMOVED == eventType;
}
private boolean isReconnectedRegistryCenter() {
return instanceService.isLocalJobInstanceExisted();
}
}
public void shutdownInstance() {
if (leaderService.isLeader()) {
leaderService.removeLeader();
}
monitorService.close();
if (reconcileService.isRunning()) {
reconcileService.stopAsync();
}
JobRegistry.getInstance().shutdown(jobName);
}