提交之后，很不幸，有个问题如下：
抓包分析：
请求和响应分别如下：
所以接下来需要对这个URL进行debug
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GET /executor?execid=6&ajax=fetchexecflow
stop in azkaban.webapp.servlet.ExecutorServlet.doGet
stop in azkaban.webapp.servlet.ExecutorServlet.ajaxFetchExecutableFlow
run
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经过研究，发现这样的行为
看来是需要跟踪QueueProcessorThread了。
stop in azkaban.executor.ExecutorManager$QueueProcessorThread.run
stop in azkaban.executor.ExecutorManager$QueueProcessorThread.handle
这个线程执行的是
selectExecutorAndDispatchFlow(reference, exflow, new HashSet<Executor>(activeExecutors));
往下就是：
Executor selectedExecutor = selectExecutor(exflow, availableExecutors);
//用户如果指定了executor,就导向对应的executor
Executor choosenExecutor = getUserSpecifiedExecutor(exflow.getExecutionOptions(), exflow.getExecutionId());
//
// If no executor was specified by admin
if (choosenExecutor == null) {//否则的话
ExecutorSelector selector = new ExecutorSelector(filterList, comparatorWeightsMap);
choosenExecutor = selector.getBest(availableExecutors, exflow);
}
return choosenExecutor;
那么，到底是如何选出来的呢？
如果没有指定comparator的话，就是基于executor自身的hashcode来算的，蛋疼！
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好，下一个问题就是任务如何发到指定的executor上呢？
欲知后事，且听下回分解！
来源：oschina
链接：https://my.oschina.net/u/1382024/blog/656167