> Date: Thu, 11 Mar 2010 13:55:20 -0800
> Subject: Re: region server appearing twice on HBase Master page
> From: st...@duboce.net
> To: hbase-user@hadoop.apache.org
>
> On Thu, Mar 11, 2010 at 1:48 PM, Michael Segel
> <michael_se...@hotmail.com> wrote:
> >
> > Hey!
> > The patch appears to be working, but can anyone give any more information
> > on what could be causing the DNS 'hiccup'?
> >
>
> Isn't this a question for your ops team? Why a lookup gives different
> answers at different times (IIUC)?
>
>
Well does the expression YMMV mean anything when it comes to interpreting their
response? ;-)
Which is why I had to ask. Depending on how the question is asked, and who you
ask, you may get a different response.
They're monitoring the system and they see that HBase is sending ipv6 requests
since its up but not in use. The thought was that it could have been the
problem. Not sure if the 'hiccup' you mentioned has anything to do with this.
> > When we shut off IPV6 and rebooted, HBase wouldn't come up, we reversed the
> > changes and could come up.
> >
>
> We don't explicity depend on ipv6. What was the issue that you were seeing?
>
> St.Ack
This is the weird thing...
On the name node, it would try to connect to itself and it would fail.
(connection refused.) Don't ask me why, but somehow it was trying to start a
region server on the master. (And no, the machine isn't listed as a region
server)
Then when I tried to shut it down and even restart it, I would see that it did
start zookeeper and the region servers were up. Just no communication between
the master and the nodes.
They backed the change out and again, I can shut down the region servers using
stop-hbase.sh, which does stop the zookeepers but the region servers now stay
up.
Not sure what is happening, of course I don't know if ops is playing around
with the configuration.
I realize that this is less than helpful, but it should explain some of the
frustration and difficulty when trying to debug a less than optimal situation.
-Mike
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