ok thanks. Understand it better now.
What is the monitor application? How does it monitor a process?
Date: Mon, 7 Jul 2014 09:31:49 +0800
From: jadetan...@qq.com
To: user@storm.incubator.apache.org
Subject: Re: The role of supervisor in Storm
But does it
monitor them
yes, the supervisor will monitor worker processes, and
restart them once they go down.
Who monitors the supervisor itself if it goes
down?
If a supervisor goes down the nimbus simply remove the
node from the cluster and reassigns the job to other node, in other word, you
lose a worknode in your cluster. It is always a good practice to run nimbus and
supervisor under monitor application.
2014-07-07
唐思成
发件人： jeff saremi
发送时间： 2014-07-06 23:20:38
收件人：
d...@storm.incubator.apache.org; user@storm.incubator.apache.org
抄送：
主题： The role of supervisor in
Storm
I posted another note earlier asking for hints and links on
in-depth architecture documentation. I didn't get any responses. Which probably
means I am the only one with this problem.
So i'll just go ahead and ask
specific questions:
What is the role of the supervisor? I know that
it starts and stops the worker processes. But does it monitor them?
how? Who monitors the supervisor itself if it goes down? Launching
something with "%java storm something" is referred to as launching the item
(nimbus) under supervision. Can anything be launched like that? Is
Supervisable an interface? or a protocol?
I tried reading the
supervisor's code but it looked like hieroglyphs to
me.
thanks
Jeff
