[Bug 1070519] [NEW] zookeeper: WARN [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxn$Factory at 247] - Too many connections from /127.0.0.1 - max is 10

[dann frazier]

Public bug reported:

I'm running juju 0.6-1ubuntu1 on a quantal/maas cloud of highbank/maas
nodes. I have a demo loop that I run to deploy hadoop, wait, add a few
nodes, wait add a few more nodes, then tear things down to just the
bootstrap node & restart. I'm finding that this will very quickly cause
a hang where any juju command fails to make progress.

ubuntu at laptop:~$ juju status
2012-10-23 13:34:17,456 INFO Connecting to environment...
<hang>

Manually inspecting the bootstrap node shows that the ssh connection
does occur - and until I ^c the juju command,
/var/log/zookeeper/zookeeper.log fills with these messages - about
2/second:

2012-10-23 15:43:16,754 - WARN
[NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxn$Factory at 247] -
Too many connections from /127.0.0.1 - max is 10

netstat output doesn't suggest a ton of active connections - I'll attach
a copy of this output in case it helps.

I've also found that running "sudo restart zookeeper" on the node frees
it up, and I can again run juju commands.

See demo.sh in lp:~dannf/+junk/arm-maas-demo to see what this sample
code looks like. Dropping the "sleep" timeouts to a low value - e.g. 10s
- seems to make the hang occur faster.

** Affects: juju (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1070519

Title:
  zookeeper: WARN
  [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxn$Factory at 247]
  - Too many connections from /127.0.0.1 - max is 10

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