On Thu, Jun 23, 2016 at 12:57:01PM +0100, 'Federico Morg Pareschi' via 
ganeti-devel wrote:
> When the watcher runs on each node group, if it can obtain the group
> lock, it submits a GROUP_VERIFY_DISKS job for each group. This happens
> every 5 minutes due to a cron job. This patch stops the watcher from
> submitting unnecessary verify disks jobs if there are some already
> pending in the queue to prevent job congestion.
> 
> Signed-off-by: Federico Morg Pareschi <m...@google.com>

Great. LGTM except for a tiny nit and a couple of lint warnings. I'll fix those
up and push.

Thanks,
Brian.

> +  existing_jobs = _GetPendingVerifyDisks(cl, uuid)
> +  if existing_jobs:
> +    logging.info("There are verify disks jobs already pending (%s), skipping 
> "
> +                 "VerifyDisks step for %s." % (existing_jobs, uuid))
> +    return

This will log something like "...jobs already pending (['68040']), skipping..."
We can use utils.CommaJoin to avoid the extra punctuation.

>    op = opcodes.OpGroupVerifyDisks(
>      group_name=uuid, priority=constants.OP_PRIO_LOW)
>    op.reason = [(constants.OPCODE_REASON_SRC_WATCHER,
> -- 
> 2.8.0.rc3.226.g39d4020
> 

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