<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Good luck! And of course ping us again if you have further questions as you move forward...</div><div><br></div><div>Jerry<br><br>Sent from my iPhone (Brevity and typos are hopefully the result of 1-fingered typing rather than rudeness or illiteracy).<div><br class="webkit-block-placeholder"></div></div><div><br>On Nov 8, 2012, at 11:31 AM, Jerry Bao <<a href="mailto:hijerrybao@gmail.com">hijerrybao@gmail.com</a>> wrote:<br><br></div><blockquote type="cite"><div><div>Thanks a lot for the answer. I will go pick up an Erlang book, right now....</div><br><div class="gmail_extra"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Date: Wed, 7 Nov 2012 14:23:24 -0800<br>
From: Jerry Kuch <<a href="mailto:jerryk@rbcon.com">jerryk@rbcon.com</a>><br>
Subject: Re: [rabbitmq-discuss] "rabbitmqctl cluster_status" output -<br>
quoted or not quoted?<br>
To: Discussions about RabbitMQ <<a href="mailto:rabbitmq-discuss@lists.rabbitmq.com">rabbitmq-discuss@lists.rabbitmq.com</a>><br>
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<br>
Hi, Jerry:<br>
<br>
Note those '-' signs in the quoted ones. Erlang's demanding that an atom<br>
name be escaped in single quotes so that the hyphen doesn't get taken as a<br>
minus sign, thereby producing a gibberish expression.<br>
<br>
If you're writing something to systematically parse things like this, you<br>
might find looking at an Erlang reference useful so you can get a sense for<br>
what types are involved in such expressions, and what the syntactic<br>
conventions and requirements are on their structures...<br>
<br>
Best regards,<br>
Jerry<br>
<br>
On Wed, Nov 7, 2012 at 2:08 PM, Jerry Bao <<a href="mailto:hijerrybao@gmail.com">hijerrybao@gmail.com</a>> wrote:<br>
<br>
> Why do some "rabbitmqctl cluster_status" outputs have single quote around<br>
> the nodes, others do not?<br>
><br>
> For example,<br>
> *[root@jbao-vm1 ~]# rabbitmqctl cluster_status*<br>
> *Cluster status of node 'rabbit@jbao-vm1' ...*<br>
> *[{nodes,[{disc,['rabbit@jbao-vm2','rabbit@jbao-vm1']}]},*<br>
> * {running_nodes,['rabbit@jbao-vm2',*<br>
> * 'rabbit@jbao-vm1']}]*<br>
> *...done.*<br>
> *<br>
> *<br>
> On another cluster, I have somthing like this:<br>
><br>
> rabbit1$ *rabbitmqctl cluster_status*<br>
> Cluster status of node rabbit@rabbit1 ...<br>
> [{nodes,[{disc,[rabbit@rabbit1,rabbit@rabbit2]},{ram,[rabbit@rabbit3]}]},<br>
> {running_nodes,[rabbit@rabbit2,rabbit@rabbit1]}]<br>
> ...done.<br>
><br>
> They are same version of RabbitMQ/Erlang/OTP, all on the same CentOS 5.7<br>
> 64bit.<br>
><br>
> I am trying to write a script to parse it so I can monitor the status of<br>
> the cluster. I have been working with RabbitMQ for a while but am<br>
> relatively new to Erlang. Does anybody know why? Is this a Erlang or OS<br>
> locale issue?<br>
><br>
> I know I can write my parser to handle both cases but just want to know<br>
> what is causing that.<br>
><br>
> Thanks,<br>
><br>
> Jerry<br>
><br>
><br>
><br>
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