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From Stephen Powis <>
Subject Re: [DISCUSS] Would like to make collective intelligence about Metrics on Storm
Date Mon, 02 May 2016 13:19:01 GMT
Oooh I'd love this as well!  I really dig the ease of the metric framework
in storm and have all the metrics go thru one centralized config.  But as
the number of storm hosts and number of tasks grow, I've found that
Graphite/Grafana has a hard time collecting up all the relevant metrics
across a lot of wildcarded keys for things like hostnames and taskIds to
properly display my graphs.

On Sun, May 1, 2016 at 8:17 AM, Kevin Conaway <>

> One thing I would like to see added (if not already present) is the
> ability to register metrics that are not tied to a component.
> As of now, the only non-component metrics are reported by the SystemBolt
> pseudo-component which feels like a work-around.  It reports JVM level
> metrics like GC time, heap size and other things that aren't associated
> with a given component.
> It would be great if application developers could expose similar metrics
> like this for things like connection pools and other JVM wide objects that
> aren't unique to a specific component.
> I don't think this is possible now, is it?
> On Wed, Apr 20, 2016 at 12:29 AM, Jungtaek Lim <> wrote:
>> Let me start sharing my thought. :)
>> 1. Need to enrich docs about metrics / stats.
>> In fact, I couldn't see the fact - topology stats are sampled by default
>> and sample rate is 0.05 - from the docs when I was newbie of Apache
>> Storm. It made me misleading and made me saying "Why there're difference
>> between the counts?". I also saw some mails from user@ about same question.
>> If we include this to guide doc that would be better.
>> And Metrics document page
>> <> seems not well
>> written. I think it has appropriate headings but lacks contents on each
>> heading.
>> It should be addressed, and introducing some external metrics consumer
>> plugins (like storm-graphite <>
>>  from Verisign) would be great, too.
>> 2. Need to increase sample rate or (ideally) no sampling at all.
>> Let's postpone considering performance hit at this time.
>> Ideally, we expect precision of metrics gets better when we increase
>> sample rate. It affects non-gauge kinds of metrics which are counter,
>> and latency, and so on.
>> Btw, I would like to hear about opinions on latency since I'm not an
>> expert.
>> Storm provides only average latency and it's indeed based on sample rate.
>> Do we feel OK with this? If not how much having also percentiles can help
>> us?
>> Thanks,
>> Jungtaek Lim (HeartSaVioR)
>> 2016년 4월 20일 (수) 오전 10:55, Jungtaek Lim <>님이
>>> Hi Storm users,
>>> I'm Jungtaek Lim, committer and PMC member of Apache Storm.
>>> If you subscribed dev@ mailing list, you may have seen that recently
>>> we're addressing the metrics feature on Apache Storm.
>>> For now, improvements are going forward based on current metrics feature.
>>> - Improve (Topology) MetricsConsumer
>>> <>
>>> - Provide topology metrics in detail (metrics per each stream)
>>> <>
>>> - (WIP) Introduce Cluster Metrics Consumer
>>> As I don't maintain large cluster for myself, I really want to collect
>>> the any ideas for improving, any inconveniences, use cases of Metrics with
>>> community members, so we're on the right way to go forward.
>>> Let's talk!
>>> Thanks in advance,
>>> Jungtaek Lim (HeartSaVioR)
> --
> Kevin Conaway

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