StarCluster - Mailing List Archive

Load Balancer issues

From: Avner May <no email>
Date: Tue, 2 Jun 2015 15:06:00 -0400

Hi all,

I was writing because I have been having a lot of issues with the load
balancer. The most common issue I have is that it fails to remove
instances effectively. In a super slow fashion, it goes through the
instances it wants to terminate (this pace is frustrating independent of
the failure/success of the operation), and one by one fails to terminate
each one. Then, I am forced to kill a subset of the nodes in my cluster
manually. But this results in the scheduler being confused by how many
nodes are actually in the network, so when I later submit jobs to the
cluster again, it thinks it has enough nodes to handle that load, and
doesn't create new instances. So I am forced to create a ton of dummy jobs
(eg, "qsub -V -b y -cwd hostname"), to trick the scheduler into thinking
that it has more queued jobs than "available" machines. These issues are
quite annoying.

Additionally, just now I had an issue where the load balancer failed to
launch a machine:

!!! ERROR - Error occured while running plugin
!!! ERROR - Failed to add new host
Traceback (most recent call last):
line 719, in _eval_add_node
line 1042, in add_nodes
    self.run_plugins(method_name="on_add_node", node=node)
line 1690, in run_plugins
    self.run_plugin(plug, method_name=method_name, node=node)
line 1715, in run_plugin
line 425, in on_add_node
line 252, in _setup_etc_hosts
line 177, in wait
    "An error occurred in ThreadPool", excs)
ThreadPoolException: An error occurred in ThreadPool
>>> Sleeping...(looping again in 60 secs)

After getting this error, for some reason the load balancer stopped
recognizing the existance of the cluster:

C:\Windows\system32>starcluster loadbalance --max_nodes=100 --min_nodes=1
--add_nodes_per_iter=17 babel2
StarCluster - ( (v. 0.95.6)
Software Tools for Academics and Researchers (STAR)
Please submit bug reports to

!!! ERROR - cluster babel2 is not running

Is anyone else hitting similar issues with the load balancer?

Received on Tue Jun 02 2015 - 15:06:23 EDT
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