12:55 a.m.
Yaniv Dary
Technical Product Manager
Red Hat Israel Ltd.
34 Jerusalem Road
Building A, 4th floor
Ra'anana, Israel 4350109
Tel : +972 (9) 7692306
8272306
Email: ydary(a)redhat.com
IRC : ydary
On Feb 21, 2017 13:06, "Francesco Romani" <fromani(a)redhat.com> wrote:
Hello everyone,
in the last weeks I've been submitting PRs to collectd upstream, to
bring the virt plugin up to date with Vdsm and oVirt needs.
Previously, the collectd virt plugin reported only a subset of metrics
oVirt uses.
In current collectd master, the collectd virt plugin provides all the
data Vdsm (thus Engine) needs. This means that it is now
possible for Vdsm or Engine to query collectd, not Vdsm/libvirt, and
have the same data.
There are only two caveats:
1. it is yet to be seen which version of collectd will ship all those
enhancements
2. collectd *intentionally* report metrics as rates, not as absolute
values as Vdsm does. This may be one issue in presence of restarts/data
loss in the link between collectd and the metrics store.
How does this work?
If we want to show memory usage over time for example, we need to have the
usage, not the rate.
How would this be reported?
Please keep reading for more details:
How to get the code?
--------------------------------
This somehow tricky until we get one official release. If one is
familiar with the RPM build process, it is easy to build one custom packages
from a snapshot from collectd master
(https://github.com/collectd/collectd) and a recent 5.7.1 RPM (like
https://koji.fedoraproject.org/koji/buildinfo?buildID=835669)
How to configure it?
------------------------------
Most thing work out of the box. One currently in progress Vdsm patch
ships the recommended configuration
https://gerrit.ovirt.org/#/c/71176/6/static/etc/collectd.d/virt.conf
The meaning of the configuration option is documented in man 5 collectd.conf
How it looks like?
--------------------------
Let me post one "screenshot" :)
$ collectdctl listval | grep a0
a0/virt/disk_octets-hdc
a0/virt/disk_octets-vda
a0/virt/disk_ops-hdc
a0/virt/disk_ops-vda
a0/virt/disk_time-hdc
a0/virt/disk_time-vda
a0/virt/if_dropped-vnet0
a0/virt/if_errors-vnet0
a0/virt/if_octets-vnet0
a0/virt/if_packets-vnet0
a0/virt/memory-actual_balloon
a0/virt/memory-rss
a0/virt/memory-total
a0/virt/ps_cputime
a0/virt/total_requests-flush-hdc
a0/virt/total_requests-flush-vda
a0/virt/total_time_in_ms-flush-hdc
a0/virt/total_time_in_ms-flush-vda
a0/virt/virt_cpu_total
a0/virt/virt_vcpu-0
a0/virt/virt_vcpu-1
How to consume the data?
-----------------------------------------
Among the ways to query collectd, the two most popular (and most fitting
for oVirt use case) ways are perhaps the network protocol
(https://collectd.org/wiki/index.php/Binary_protocol)
and the plain text protocol
(https://collectd.org/wiki/index.php/Plain_text_protocol). The first
could be used by Engine to get the data directly, or to consolidate the
metrics in one database (e.g to run any kind of query, for historical
series...).
The latter will be used by Vdsm to keep reporting the metrics (again
https://gerrit.ovirt.org/#/c/71176/6)
Please note that the performance of the plain text protocol are known to
be lower than the binary protocol
What about the unresponsive hosts?
-------------------------------------------------------
We know from experience that hosts may become unresponsive, and this can
disrupt monitoring. however, we do want to keep monitoring the
responsive hosts, avoiding that one rogue hosts makes us lose all the
monitoring data.
To cope with this need, the virt plugin gained support for "partition
tag". With this, we can group VMs together using one arbitrary tag. This
is completely transparent to collectd, and also completely optional.
oVirt can use this tag to group VMs per-storage-domain, or however it
sees fit, trying to minimize the disruption should one host become
unresponsive.
Read the full docs here:
https://github.com/collectd/collectd/commit/999efc28d8e2e96bc15f535254d412
a79755ca4f
What about the collectd-ovirt plugin?
--------------------------------------------------------
Some time ago I implemented one out-of-tree collectd plugin leveraging
the libvirt bulk stats: https://github.com/fromanirh/collectd-ovirt
This plugin is meant to be a modern, drop-in replacement for the
existing virt plugin.
The development of that out of tree plugin is now halted, because we
have everything we need in the upstream collectd plugin.
Future work
------------------
We believe we have reached feature parity, so we are looking for
bugixes/performance tuning in the near term future. I'll be happy to
provide more patches/PRs about that.
Thanks and bests,
--
Francesco Romani
Red Hat Engineering Virtualization R & D
IRC: fromani
_______________________________________________
Devel mailing list
Devel(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/devel
5:57 p.m.
New subject: [monitoring][collectd] the collectd virt plugin is now on par with Vdsm needs
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On 02/21/2017 11:55 PM, Yaniv Dary wrote:
Yaniv Dary
Technical Product Manager
Red Hat Israel Ltd.
34 Jerusalem Road
Building A, 4th floor
Ra'anana, Israel 4350109
Tel : +972 (9) 7692306
8272306
Email: ydary(a)redhat.com <mailto:ydary@redhat.com>
IRC : ydary
On Feb 21, 2017 13:06, "Francesco Romani" <fromani(a)redhat.com
<mailto:fromani@redhat.com>> wrote:
Hello everyone,
in the last weeks I've been submitting PRs to collectd upstream, to
bring the virt plugin up to date with Vdsm and oVirt needs.
Previously, the collectd virt plugin reported only a subset of metrics
oVirt uses.
In current collectd master, the collectd virt plugin provides all the
data Vdsm (thus Engine) needs. This means that it is now
possible for Vdsm or Engine to query collectd, not Vdsm/libvirt, and
have the same data.
There are only two caveats:
1. it is yet to be seen which version of collectd will ship all those
enhancements
2. collectd *intentionally* report metrics as rates, not as absolute
values as Vdsm does. This may be one issue in presence of
restarts/data
loss in the link between collectd and the metrics store.
How does this work?
If we want to show memory usage over time for example, we need to have
the usage, not the rate.
How would this be reported?
I was imprecise, my fault.
Let me retry:
collectd intentionally report quite a lot of metrics we care about as
rates, not as absolute values.
Memory is actually ok fine.
a0/virt/disk_octets-hdc -> rate
a0/virt/disk_octets-vda
a0/virt/disk_ops-hdc -> rate
a0/virt/disk_ops-vda
a0/virt/disk_time-hdc -> rate
a0/virt/disk_time-vda
a0/virt/if_dropped-vnet0 -> rate
a0/virt/if_errors-vnet0 -> rate
a0/virt/if_octets-vnet0 -> rate
a0/virt/if_packets-vnet0 -> rate
a0/virt/memory-actual_balloon -> absolute
a0/virt/memory-rss -> absolute
a0/virt/memory-total -> absolute
a0/virt/ps_cputime -> rate
a0/virt/total_requests-flush-hdc -> rate
a0/virt/total_requests-flush-vda
a0/virt/total_time_in_ms-flush-hdc -> rate
a0/virt/total_time_in_ms-flush-vda
a0/virt/virt_cpu_total -> rate
a0/virt/virt_vcpu-0 -> rate
a0/virt/virt_vcpu-1
collectd "just" reports the changes since the last sampling. I'm not
sure which is the best way to handle that; I've sent a mail to collectd
list some time ago, no answer so far.
--
Francesco Romani
Red Hat Engineering Virtualization R & D
IRC: fromani
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On 02/21/2017 11:55 PM, Yaniv Dary wrote:<br>
<blockquote
cite="mid:CACKMAy9CwXBZpJSOXqpfKg8j4O7hGn4qR94VXAKyWxtGroUD8w@mail.gmail.com"
type="cite">
<div dir="auto">
<div><br>
<br>
<div data-smartmail="gmail_signature">Yaniv Dary<br>
Technical Product Manager<br>
Red Hat Israel Ltd.<br>
34 Jerusalem Road<br>
Building A, 4th floor<br>
Ra'anana, Israel 4350109<br>
<br>
Tel : +972 (9) 7692306<br>
8272306<br>
Email: <a moz-do-not-send="true"
href="mailto:ydary@redhat.com">ydary@redhat.com</a><br>
IRC : ydary</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Feb 21, 2017 13:06,
"Francesco
Romani" <<a moz-do-not-send="true"
href="mailto:fromani@redhat.com">fromani@redhat.com</a>>
wrote:<br type="attribution">
<blockquote class="quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">Hello
everyone,<br>
<br>
<br>
in the last weeks I've been submitting PRs to collectd
upstream, to<br>
bring the virt plugin up to date with Vdsm and oVirt
needs.<br>
<br>
Previously, the collectd virt plugin reported only a
subset of metrics<br>
oVirt uses.<br>
<br>
In current collectd master, the collectd virt plugin
provides all the<br>
data Vdsm (thus Engine) needs. This means that it is now<br>
<br>
possible for Vdsm or Engine to query collectd, not
Vdsm/libvirt, and<br>
have the same data.<br>
<br>
<br>
There are only two caveats:<br>
<br>
1. it is yet to be seen which version of collectd will
ship all those<br>
enhancements<br>
<br>
2. collectd *intentionally* report metrics as rates, not
as absolute<br>
values as Vdsm does. This may be one issue in presence
of restarts/data<br>
loss in the link between collectd and the metrics store.<br>
</blockquote>
</div>
</div>
</div>
<div dir="auto"><br>
</div>
<div dir="auto">How does this work? </div>
<div dir="auto">If we want to show memory usage over time for
example, we need to have the usage, not the rate. </div>
<div dir="auto">How would this be reported? <br>
</div>
</div>
</blockquote>
<br>
I was imprecise, my fault.<br>
<br>
Let me retry:<br>
collectd intentionally report quite a lot of metrics we care about
as rates, not as absolute values.<br>
Memory is actually ok fine.<br>
<br>
a0/virt/disk_octets-hdc -> rate<br>
a0/virt/disk_octets-vda<br>
a0/virt/disk_ops-hdc -> rate<br>
a0/virt/disk_ops-vda<br>
a0/virt/disk_time-hdc -> rate<br>
a0/virt/disk_time-vda<br>
a0/virt/if_dropped-vnet0 -> rate<br>
a0/virt/if_errors-vnet0 -> rate<br>
a0/virt/if_octets-vnet0 -> rate<br>
a0/virt/if_packets-vnet0 -> rate<br>
a0/virt/memory-actual_balloon -> absolute<br>
a0/virt/memory-rss -> absolute<br>
a0/virt/memory-total -> absolute<br>
a0/virt/ps_cputime -> rate<br>
a0/virt/total_requests-flush-hdc -> rate<br>
a0/virt/total_requests-flush-vda<br>
a0/virt/total_time_in_ms-flush-hdc -> rate<br>
a0/virt/total_time_in_ms-flush-vda<br>
a0/virt/virt_cpu_total -> rate<br>
a0/virt/virt_vcpu-0 -> rate<br>
a0/virt/virt_vcpu-1<br>
<br>
collectd "just" reports the changes since the last sampling. I'm not
sure which is the best way to handle that; I've sent a mail to
collectd list some time ago, no answer so far.<br>
<br>
<br>
<br>
<pre class="moz-signature" cols="72">--
Francesco Romani
Red Hat Engineering Virtualization R & D
IRC: fromani</pre>
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--------------D9BDB513741273D7BA913655--
4:13 p.m.
New subject: [monitoring][collectd] the collectd virt plugin is now on par with Vdsm needs
Yaniv Dary
Technical Product Manager
Red Hat Israel Ltd.
34 Jerusalem Road
Building A, 4th floor
Ra'anana, Israel 4350109
Tel : +972 (9) 7692306
8272306
Email: ydary(a)redhat.com
IRC : ydary
On Wed, Feb 22, 2017 at 5:57 PM, Francesco Romani <fromani(a)redhat.com>
wrote:
On 02/21/2017 11:55 PM, Yaniv Dary wrote:
Yaniv Dary
Technical Product Manager
Red Hat Israel Ltd.
34 Jerusalem Road
Building A, 4th floor
Ra'anana, Israel 4350109
Tel : +972 (9) 7692306 <+972%209-769-2306>
8272306
Email: ydary(a)redhat.com
IRC : ydary
On Feb 21, 2017 13:06, "Francesco Romani" <fromani(a)redhat.com> wrote:
Hello everyone,
in the last weeks I've been submitting PRs to collectd upstream, to
bring the virt plugin up to date with Vdsm and oVirt needs.
Previously, the collectd virt plugin reported only a subset of metrics
oVirt uses.
In current collectd master, the collectd virt plugin provides all the
data Vdsm (thus Engine) needs. This means that it is now
possible for Vdsm or Engine to query collectd, not Vdsm/libvirt, and
have the same data.
There are only two caveats:
1. it is yet to be seen which version of collectd will ship all those
enhancements
2. collectd *intentionally* report metrics as rates, not as absolute
values as Vdsm does. This may be one issue in presence of restarts/data
loss in the link between collectd and the metrics store.
How does this work?
If we want to show memory usage over time for example, we need to have the
usage, not the rate.
How would this be reported?
I was imprecise, my fault.
Let me retry:
collectd intentionally report quite a lot of metrics we care about as
rates, not as absolute values.
Memory is actually ok fine.
a0/virt/disk_octets-hdc -> rate
a0/virt/disk_octets-vda
a0/virt/disk_ops-hdc -> rate
a0/virt/disk_ops-vda
a0/virt/disk_time-hdc -> rate
a0/virt/disk_time-vda
a0/virt/if_dropped-vnet0 -> rate
a0/virt/if_errors-vnet0 -> rate
a0/virt/if_octets-vnet0 -> rate
a0/virt/if_packets-vnet0 -> rate
a0/virt/memory-actual_balloon -> absolute
a0/virt/memory-rss -> absolute
a0/virt/memory-total -> absolute
a0/virt/ps_cputime -> rate
a0/virt/total_requests-flush-hdc -> rate
a0/virt/total_requests-flush-vda
a0/virt/total_time_in_ms-flush-hdc -> rate
a0/virt/total_time_in_ms-flush-vda
a0/virt/virt_cpu_total -> rate
a0/virt/virt_vcpu-0 -> rate
a0/virt/virt_vcpu-1
collectd "just" reports the changes since the last sampling. I'm not sure
which is the best way to handle that; I've sent a mail to collectd list
some time ago, no answer so far.
Can you CC on that thread?
I don't know how ES would work with rates at all.
I want to be able to show CPU usage over time and I need to know if its 80%
or 10%.
--
Francesco Romani
Red Hat Engineering Virtualization R & D
IRC: fromani
10:11 a.m.
New subject: [monitoring][collectd] the collectd virt plugin is now on par with Vdsm needs
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On 02/26/2017 03:13 PM, Yaniv Dary wrote:
> 2. collectd *intentionally* report metrics as rates, not as
> absolute
> values as Vdsm does. This may be one issue in presence of
> restarts/data
> loss in the link between collectd and the metrics store.
>
>
> How does this work?
> If we want to show memory usage over time for example, we need to
> have the usage, not the rate.
> How would this be reported?
I was imprecise, my fault.
Let me retry:
collectd intentionally report quite a lot of metrics we care about
as rates, not as absolute values.
Memory is actually ok fine.
a0/virt/disk_octets-hdc -> rate
a0/virt/disk_octets-vda
a0/virt/disk_ops-hdc -> rate
a0/virt/disk_ops-vda
a0/virt/disk_time-hdc -> rate
a0/virt/disk_time-vda
a0/virt/if_dropped-vnet0 -> rate
a0/virt/if_errors-vnet0 -> rate
a0/virt/if_octets-vnet0 -> rate
a0/virt/if_packets-vnet0 -> rate
a0/virt/memory-actual_balloon -> absolute
a0/virt/memory-rss -> absolute
a0/virt/memory-total -> absolute
a0/virt/ps_cputime -> rate
a0/virt/total_requests-flush-hdc -> rate
a0/virt/total_requests-flush-vda
a0/virt/total_time_in_ms-flush-hdc -> rate
a0/virt/total_time_in_ms-flush-vda
a0/virt/virt_cpu_total -> rate
a0/virt/virt_vcpu-0 -> rate
a0/virt/virt_vcpu-1
collectd "just" reports the changes since the last sampling. I'm
not sure which is the best way to handle that; I've sent a mail to
collectd list some time ago, no answer so far.
Can you CC on that thread?
I don't know how ES would work with rates at all.
I want to be able to show CPU usage over time and I need to know if
its 80% or 10%.
Thanks to the awkward gmail interface I can't reply to myself and CC
other people, but I can share the link:
https://mailman.verplant.org/pipermail/collectd/2017-January/006965.html
--
Francesco Romani
Red Hat Engineering Virtualization R & D
IRC: fromani
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<br>
<div class="moz-cite-prefix">On 02/26/2017 03:13 PM, Yaniv Dary
wrote:<br>
</div>
<blockquote
cite="mid:CACKMAy_kfX=LCNe+7EFD2Cjw_Wit+aDS8FR+RPKEo=cMXU+H+A@mail.gmail.com"
type="cite">
<div dir="ltr"><br>
<div class="gmail_extra">
<div class="gmail_quote">
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
<div>
<div class="h5">
<blockquote type="cite">
<div dir="auto">
<div>
<div class="gmail_extra">
<div class="gmail_quote">
<blockquote
class="m_-684850395146887592quote"
style="margin:0 0 0 .8ex;border-left:1px
#ccc solid;padding-left:1ex"> 2.
collectd *intentionally* report metrics
as rates, not as absolute<br>
values as Vdsm does. This may be one
issue in presence of restarts/data<br>
loss in the link between collectd and
the metrics store.<br>
</blockquote>
</div>
</div>
</div>
<div dir="auto"><br>
</div>
<div dir="auto">How does this work? </div>
<div dir="auto">If we want to show memory usage
over time for example, we need to have the
usage, not the rate. </div>
<div dir="auto">How would this be reported?
<br>
</div>
</div>
</blockquote>
<br>
</div>
</div>
I was imprecise, my fault.<br>
<br>
Let me retry:<br>
collectd intentionally report quite a lot of metrics we
care about as rates, not as absolute values.<br>
Memory is actually ok fine.<br>
<br>
a0/virt/disk_octets-hdc -> rate<br>
a0/virt/disk_octets-vda<br>
a0/virt/disk_ops-hdc -> rate<br>
a0/virt/disk_ops-vda<br>
a0/virt/disk_time-hdc -> rate<br>
a0/virt/disk_time-vda<br>
a0/virt/if_dropped-vnet0 -> rate<br>
a0/virt/if_errors-vnet0 -> rate<br>
a0/virt/if_octets-vnet0 -> rate<br>
a0/virt/if_packets-vnet0 -> rate<br>
a0/virt/memory-actual_balloon -> absolute<br>
a0/virt/memory-rss -> absolute<br>
a0/virt/memory-total -> absolute<br>
a0/virt/ps_cputime -> rate<br>
a0/virt/total_requests-flush-<wbr>hdc -> rate<br>
a0/virt/total_requests-flush-<wbr>vda<br>
a0/virt/total_time_in_ms-<wbr>flush-hdc -> rate<br>
a0/virt/total_time_in_ms-<wbr>flush-vda<br>
a0/virt/virt_cpu_total -> rate<br>
a0/virt/virt_vcpu-0 -> rate<br>
a0/virt/virt_vcpu-1<br>
<br>
collectd "just" reports the changes since the last
sampling. I'm not sure which is the best way to handle
that; I've sent a mail to collectd list some time ago,
no answer so far.</div>
</blockquote>
<div><br>
</div>
<div>Can you CC on that thread?</div>
<div>I don't know how ES would work with rates at all. </div>
<div>I want to be able to show CPU usage over time and I
need to know if its 80% or 10%.</div>
<br>
</div>
</div>
</div>
</blockquote>
<br>
Thanks to the awkward gmail interface I can't reply to myself and CC
other people, but I can share the link:<br>
<br>
<a class="moz-txt-link-freetext"
href="https://mailman.verplant.org/pipermail/collectd/2017-January/0...
<br>
<pre class="moz-signature" cols="72">--
Francesco Romani
Red Hat Engineering Virtualization R & D
IRC: fromani</pre>
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--------------A2FDAF300209D96688B3E8CC--
2:32 p.m.
New subject: [monitoring][collectd] the collectd virt plugin is now on par with Vdsm needs
This is about accumulative values, I'm also asking about stats like CPU
usage of the VM\Host that is not reported in absolute value.
Can you bump the thread?
Yaniv Dary
Technical Product Manager
Red Hat Israel Ltd.
34 Jerusalem Road
Building A, 4th floor
Ra'anana, Israel 4350109
Tel : +972 (9) 7692306
8272306
Email: ydary(a)redhat.com
IRC : ydary
On Mon, Feb 27, 2017 at 10:11 AM, Francesco Romani <fromani(a)redhat.com>
wrote:
On 02/26/2017 03:13 PM, Yaniv Dary wrote:
2. collectd *intentionally* report metrics as rates, not as absolute
> values as Vdsm does. This may be one issue in presence of restarts/data
> loss in the link between collectd and the metrics store.
>
>
> How does this work?
> If we want to show memory usage over time for example, we need to have
> the usage, not the rate.
> How would this be reported?
>
>
> I was imprecise, my fault.
>
> Let me retry:
> collectd intentionally report quite a lot of metrics we care about as
> rates, not as absolute values.
> Memory is actually ok fine.
>
> a0/virt/disk_octets-hdc -> rate
> a0/virt/disk_octets-vda
> a0/virt/disk_ops-hdc -> rate
> a0/virt/disk_ops-vda
> a0/virt/disk_time-hdc -> rate
> a0/virt/disk_time-vda
> a0/virt/if_dropped-vnet0 -> rate
> a0/virt/if_errors-vnet0 -> rate
> a0/virt/if_octets-vnet0 -> rate
> a0/virt/if_packets-vnet0 -> rate
> a0/virt/memory-actual_balloon -> absolute
> a0/virt/memory-rss -> absolute
> a0/virt/memory-total -> absolute
> a0/virt/ps_cputime -> rate
> a0/virt/total_requests-flush-hdc -> rate
> a0/virt/total_requests-flush-vda
> a0/virt/total_time_in_ms-flush-hdc -> rate
> a0/virt/total_time_in_ms-flush-vda
> a0/virt/virt_cpu_total -> rate
> a0/virt/virt_vcpu-0 -> rate
> a0/virt/virt_vcpu-1
>
> collectd "just" reports the changes since the last sampling. I'm not
sure
> which is the best way to handle that; I've sent a mail to collectd list
> some time ago, no answer so far.
>
Can you CC on that thread?
I don't know how ES would work with rates at all.
I want to be able to show CPU usage over time and I need to know if its
80% or 10%.
Thanks to the awkward gmail interface I can't reply to myself and CC other
people, but I can share the link:
https://mailman.verplant.org/pipermail/collectd/2017-January/006965.html
--
Francesco Romani
Red Hat Engineering Virtualization R & D
IRC: fromani
1:07 p.m.
New subject: [monitoring][collectd] the collectd virt plugin is now on par with Vdsm needs
On 02/27/2017 01:32 PM, Yaniv Dary wrote:
This is about accumulative values, I'm also asking about stats
like
CPU usage of the VM\Host that is not reported in absolute value.
Can you bump the thread?
Done, let's see.
Speaking about options: during the reviews of my pull requests we also
discussed the (semi?)recommended way to report more values without
adding new collectd types, which is something the collectd upstream
really tries to avoid.
So we could report the current values *and* the absolutes, making
everyone happy; but I'm afraid this will require a new plugin, like the
one I had in the working (https://github.com/fromanirh/collectd-ovirt)
TL;DR: in the worst case, we have one safe fallback option.
--
Francesco Romani
Red Hat Engineering Virtualization R & D
IRC: fromani
1:24 p.m.
New subject: [monitoring][collectd] the collectd virt plugin is now on par with Vdsm needs
We need good answers from them to why they do not support this use case.
Maybe a github issue on the use case would get more attention. They should
allow us to choose how to present and collect the data.
Can you open one?
Yaniv Dary
Technical Product Manager
Red Hat Israel Ltd.
34 Jerusalem Road
Building A, 4th floor
Ra'anana, Israel 4350109
Tel : +972 (9) 7692306 <+972%209-769-2306>
8272306
Email: ydary(a)redhat.com
IRC : ydary
On Tue, Feb 28, 2017 at 1:07 PM, Francesco Romani <fromani(a)redhat.com>
wrote:
On 02/27/2017 01:32 PM, Yaniv Dary wrote:
> This is about accumulative values, I'm also asking about stats like
> CPU usage of the VM\Host that is not reported in absolute value.
> Can you bump the thread?
Done, let's see.
Speaking about options: during the reviews of my pull requests we also
discussed the (semi?)recommended way to report more values without
adding new collectd types, which is something the collectd upstream
really tries to avoid.
So we could report the current values *and* the absolutes, making
everyone happy; but I'm afraid this will require a new plugin, like the
one I had in the working (https://github.com/fromanirh/collectd-ovirt)
TL;DR: in the worst case, we have one safe fallback option.
--
Francesco Romani
Red Hat Engineering Virtualization R & D
IRC: fromani
4:06 p.m.
New subject: [monitoring][collectd] the collectd virt plugin is now on par with Vdsm needs
On 02/28/2017 12:24 PM, Yaniv Dary wrote:
We need good answers from them to why they do not support this use
case.
Maybe a github issue on the use case would get more attention. They
should allow us to choose how to present and collect the data.
Can you open one?
I can, and I will if I get no answer in few more days.
Meantime, among other things, I'm doing my homework to understand why
they do like that.
This is the best source of information I found so far (please check the
whole thread, it's pretty short):
https://mailman.verplant.org/pipermail/collectd/2013-September/005924.html
Quoting part of the email
"""
We only came up with one use case where having the raw counter values is
beneficial: If you want to calculate the average rate over arbitrary
time spans, it's easier to look up the raw counter values for those
points in time and go from there. However, you can also sum up the
individual rates to reach the same result. Finally, when handling
counter resets / overflows within this interval, integrating over /
summing rates is trivial by comparison.
Do you have any other use-case for raw counter values?
Pro:
* Handling of values becomes easier.
* The rate is calculated only once, in contrast to potentially several
times, which might be more efficient (currently each rate conversion
involves a lookup call).
* Together with (1), this removes the need for having the "types.db",
which could be removed then. We were in wild agreement that this
would be a worthwhile goal.
Contra:
* Original raw value is lost. It can be reconstructed except for a
(more or less) constant offset, though.
"""
Looks like this change was intentional and implemented after some
discussion.
Bests,
--
Francesco Romani
Red Hat Engineering Virtualization R & D
IRC: fromani
4:17 p.m.
New subject: [monitoring][collectd] the collectd virt plugin is now on par with Vdsm needs
Yaniv Dary
Technical Product Manager
Red Hat Israel Ltd.
34 Jerusalem Road
Building A, 4th floor
Ra'anana, Israel 4350109
Tel : +972 (9) 7692306
8272306
Email: ydary(a)redhat.com
IRC : ydary
On Tue, Feb 28, 2017 at 4:06 PM, Francesco Romani <fromani(a)redhat.com>
wrote:
On 02/28/2017 12:24 PM, Yaniv Dary wrote:
> We need good answers from them to why they do not support this use case.
> Maybe a github issue on the use case would get more attention. They
> should allow us to choose how to present and collect the data.
> Can you open one?
>
I can, and I will if I get no answer in few more days.
Meantime, among other things, I'm doing my homework to understand why
they do like that.
This is the best source of information I found so far (please check the
whole thread, it's pretty short):
https://mailman.verplant.org/pipermail/collectd/2013-September/005924.html
Quoting part of the email
"""
We only came up with one use case where having the raw counter values is
beneficial: If you want to calculate the average rate over arbitrary
time spans, it's easier to look up the raw counter values for those
points in time and go from there. However, you can also sum up the
individual rates to reach the same result. Finally, when handling
counter resets / overflows within this interval, integrating over /
summing rates is trivial by comparison.
Do you have any other use-case for raw counter values?
Pro:
* Handling of values becomes easier.
* The rate is calculated only once, in contrast to potentially several
times, which might be more efficient (currently each rate conversion
involves a lookup call).
* Together with (1), this removes the need for having the "types.db",
which could be removed then. We were in wild agreement that this
would be a worthwhile goal.
Not for adding units:
https://github.com/collectd/collectd/issues/2047
Contra:
* Original raw value is lost. It can be reconstructed except for a
(more or less) constant offset, though.
How is this done?
"""
Looks like this change was intentional and implemented after some
discussion.
I understand this, but most monitoring system will not know what to do with
this value.
Bests,
--
Francesco Romani
Red Hat Engineering Virtualization R & D
IRC: fromani
4:38 p.m.
New subject: [monitoring][collectd] the collectd virt plugin is now on par with Vdsm needs
Any updates on the usage of collectd with rates?
Yaniv Dary
Technical Product Manager
Red Hat Israel Ltd.
34 Jerusalem Road
Building A, 4th floor
Ra'anana, Israel 4350109
Tel : +972 (9) 7692306
8272306
Email: ydary(a)redhat.com
IRC : ydary
On Tue, Feb 28, 2017 at 4:17 PM, Yaniv Dary <ydary(a)redhat.com> wrote:
Yaniv Dary
Technical Product Manager
Red Hat Israel Ltd.
34 Jerusalem Road
Building A, 4th floor
Ra'anana, Israel 4350109
Tel : +972 (9) 7692306 <+972%209-769-2306>
8272306
Email: ydary(a)redhat.com
IRC : ydary
On Tue, Feb 28, 2017 at 4:06 PM, Francesco Romani <fromani(a)redhat.com>
wrote:
>
> On 02/28/2017 12:24 PM, Yaniv Dary wrote:
> > We need good answers from them to why they do not support this use case.
> > Maybe a github issue on the use case would get more attention. They
> > should allow us to choose how to present and collect the data.
> > Can you open one?
> >
>
> I can, and I will if I get no answer in few more days.
> Meantime, among other things, I'm doing my homework to understand why
> they do like that.
>
> This is the best source of information I found so far (please check the
> whole thread, it's pretty short):
>
> https://mailman.verplant.org/pipermail/collectd/2013-Septemb
> er/005924.html
>
> Quoting part of the email
>
> """
>
> We only came up with one use case where having the raw counter values is
> beneficial: If you want to calculate the average rate over arbitrary
> time spans, it's easier to look up the raw counter values for those
> points in time and go from there. However, you can also sum up the
> individual rates to reach the same result. Finally, when handling
> counter resets / overflows within this interval, integrating over /
> summing rates is trivial by comparison.
>
> Do you have any other use-case for raw counter values?
>
> Pro:
>
> * Handling of values becomes easier.
> * The rate is calculated only once, in contrast to potentially several
> times, which might be more efficient (currently each rate conversion
> involves a lookup call).
> * Together with (1), this removes the need for having the "types.db",
> which could be removed then. We were in wild agreement that this
> would be a worthwhile goal.
>
Not for adding units:
https://github.com/collectd/collectd/issues/2047
>
> Contra:
>
> * Original raw value is lost. It can be reconstructed except for a
> (more or less) constant offset, though.
>
How is this done?
> """
>
>
> Looks like this change was intentional and implemented after some
> discussion.
>
I understand this, but most monitoring system will not know what to do
with this value.
>
> Bests,
>
> --
> Francesco Romani
> Red Hat Engineering Virtualization R & D
> IRC: fromani
>
>
9:44 a.m.
New subject: [monitoring][collectd] the collectd virt plugin is now on par with Vdsm needs
This is a multi-part message in MIME format.
--------------E85C2B9AFE0A650E0EA7DD1A
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit
No updates yet. I'll move forward filing a github issue, hoping to
gather more feedback.
Bests,
On 03/12/2017 03:38 PM, Yaniv Dary wrote:
Any updates on the usage of collectd with rates?
Yaniv Dary Technical Product Manager Red Hat Israel Ltd. 34 Jerusalem
Road Building A, 4th floor Ra'anana, Israel 4350109 Tel : +972 (9)
7692306 8272306 Email: ydary(a)redhat.com <mailto:ydary@redhat.com> IRC
: ydary
On Tue, Feb 28, 2017 at 4:17 PM, Yaniv Dary <ydary(a)redhat.com
<mailto:ydary@redhat.com>> wrote:
Yaniv Dary Technical Product Manager Red Hat Israel Ltd. 34
Jerusalem Road Building A, 4th floor Ra'anana, Israel 4350109 Tel
: +972 (9) 7692306 <tel:+972%209-769-2306> 8272306 Email:
ydary(a)redhat.com <mailto:ydary@redhat.com> IRC : ydary
On Tue, Feb 28, 2017 at 4:06 PM, Francesco Romani
<fromani(a)redhat.com <mailto:fromani@redhat.com>> wrote:
On 02/28/2017 12:24 PM, Yaniv Dary wrote:
> We need good answers from them to why they do not support
this use case.
> Maybe a github issue on the use case would get more
attention. They
> should allow us to choose how to present and collect the data.
> Can you open one?
>
I can, and I will if I get no answer in few more days.
Meantime, among other things, I'm doing my homework to
understand why
they do like that.
This is the best source of information I found so far (please
check the
whole thread, it's pretty short):
https://mailman.verplant.org/pipermail/collectd/2013-September/005924.html
<https://mailman.verplant.org/pipermail/collectd/2013-September/005924.htm...
Quoting part of the email
"""
We only came up with one use case where having the raw counter
values is
beneficial: If you want to calculate the average rate over
arbitrary
time spans, it's easier to look up the raw counter values for
those
points in time and go from there. However, you can also sum up the
individual rates to reach the same result. Finally, when handling
counter resets / overflows within this interval, integrating
over /
summing rates is trivial by comparison.
Do you have any other use-case for raw counter values?
Pro:
* Handling of values becomes easier.
* The rate is calculated only once, in contrast to
potentially several
times, which might be more efficient (currently each rate
conversion
involves a lookup call).
* Together with (1), this removes the need for having the
"types.db",
which could be removed then. We were in wild agreement
that this
would be a worthwhile goal.
Not for adding units:
https://github.com/collectd/collectd/issues/2047
<https://github.com/collectd/collectd/issues/2047>
Contra:
* Original raw value is lost. It can be reconstructed except
for a
(more or less) constant offset, though.
How is this done?
"""
Looks like this change was intentional and implemented after some
discussion.
I understand this, but most monitoring system will not know what
to do with this value.
Bests,
--
Francesco Romani
Red Hat Engineering Virtualization R & D
IRC: fromani
--
Francesco Romani
Red Hat Engineering Virtualization R & D
IRC: fromani
--------------E85C2B9AFE0A650E0EA7DD1A
Content-Type: text/html; charset=utf-8
Content-Transfer-Encoding: 8bit
<html>
<head>
<meta content="text/html; charset=utf-8"
http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000000">
<p>No updates yet. I'll move forward filing a github issue, hoping
to gather more feedback.<br>
</p>
<p><br>
</p>
<p>Bests,<br>
</p>
<br>
<div class="moz-cite-prefix">On 03/12/2017 03:38 PM, Yaniv Dary
wrote:<br>
</div>
<blockquote
cite="mid:CACKMAy8eed-UG35Fgw9R3jjcqwqQ6S6TimL9MYOob3EFh+Hvfw@mail.gmail.com"
type="cite">
<div dir="ltr">Any updates on the usage of collectd with
rates?</div>
<div class="gmail_extra"><br clear="all">
<div>
<div class="gmail_signature"
data-smartmail="gmail_signature">
<div dir="ltr">
<div>
<div dir="ltr">
<pre cols="72"><span
style="font-family:arial,helvetica,sans-serif">Yaniv Dary
Technical Product Manager
Red Hat Israel Ltd.
34 Jerusalem Road
Building A, 4th floor
Ra'anana, Israel 4350109
Tel : +972 (9) 7692306
8272306
Email: <a moz-do-not-send="true" href="mailto:ydary@redhat.com"
target="_blank">ydary(a)redhat.com</a>
IRC : ydary</span></pre>
</div>
</div>
</div>
</div>
</div>
<br>
<div class="gmail_quote">On Tue, Feb 28, 2017 at 4:17 PM, Yaniv
Dary <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:ydary@redhat.com"
target="_blank">ydary(a)redhat.com</a>&gt;</span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr"><br>
<div class="gmail_extra"><span
class=""><br clear="all">
<div>
<div class="m_7881526957566044995gmail_signature">
<div dir="ltr">
<div>
<div dir="ltr">
<pre cols="72"><span
style="font-family:arial,helvetica,sans-serif">Yaniv Dary
Technical Product Manager
Red Hat Israel Ltd.
34 Jerusalem Road
Building A, 4th floor
Ra'anana, Israel 4350109
Tel : <a moz-do-not-send="true" href="tel:+972%209-769-2306"
value="+97297692306" target="_blank">+972 (9) 7692306</a>
8272306
Email: <a moz-do-not-send="true" href="mailto:ydary@redhat.com"
target="_blank">ydary(a)redhat.com</a>
IRC : ydary</span></pre>
</div>
</div>
</div>
</div>
</div>
<br>
</span>
<div class="gmail_quote">
<div>
<div class="h5">On Tue, Feb 28, 2017 at 4:06 PM,
Francesco Romani <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:fromani@redhat.com"
target="_blank">fromani(a)redhat.com</a>&gt;</span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0px
0px 0px 0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex"><span
class="m_7881526957566044995gmail-"><br>
On 02/28/2017 12:24 PM, Yaniv Dary wrote:<br>
> We need good answers from them to why
they do not support this use case.<br>
> Maybe a github issue on the use case
would get more attention. They<br>
> should allow us to choose how to present
and collect the data.<br>
> Can you open one?<br>
><br>
<br>
</span>I can, and I will if I get no answer in
few more days.<br>
Meantime, among other things, I'm doing my
homework to understand why<br>
they do like that.<br>
<br>
This is the best source of information I found
so far (please check the<br>
whole thread, it's pretty short):<br>
<br>
<a moz-do-not-send="true"
href="https://mailman.verplant.org/pipermail/collectd/2013-September...
rel="noreferrer"
target="_blank">https://mailman.verplant.org/p<wbr>ipe...
<br>
Quoting part of the email<br>
<br>
"""<br>
<br>
We only came up with one use case where having
the raw counter values is<br>
beneficial: If you want to calculate the average
rate over arbitrary<br>
time spans, it's easier to look up the raw
counter values for those<br>
points in time and go from there. However, you
can also sum up the<br>
individual rates to reach the same result.
Finally, when handling<br>
counter resets / overflows within this interval,
integrating over /<br>
summing rates is trivial by comparison.<br>
<br>
Do you have any other use-case for raw counter
values?<br>
<br>
Pro:<br>
<br>
* Handling of values becomes easier.<br>
* The rate is calculated only once, in
contrast to potentially several<br>
times, which might be more efficient
(currently each rate conversion<br>
involves a lookup call).<br>
* Together with (1), this removes the need for
having the "types.db",<br>
which could be removed then. We were in wild
agreement that this<br>
would be a worthwhile goal.<br>
</blockquote>
<div><br>
</div>
</div>
</div>
<div>Not for adding units:</div>
<div><a moz-do-not-send="true"
href="https://github.com/collectd/collectd/issues/2047"
target="_blank">https://github.com/collectd/<wbr>colle...
</div>
<span class="">
<div> </div>
<blockquote class="gmail_quote" style="margin:0px
0px 0px 0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<br>
Contra:<br>
<br>
* Original raw value is lost. It can be
reconstructed except for a<br>
(more or less) constant offset, though.<br>
</blockquote>
<div><br>
</div>
</span>
<div>How is this done?</div>
<span class="">
<div> </div>
<blockquote class="gmail_quote" style="margin:0px
0px 0px 0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
"""<br>
<br>
<br>
Looks like this change was intentional and
implemented after some<br>
discussion.<br>
</blockquote>
<div><br>
</div>
</span>
<div>I understand this, but most monitoring system
will not know what to do with this value.</div>
<span class="">
<div> </div>
<blockquote class="gmail_quote" style="margin:0px
0px 0px 0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<br>
Bests,<br>
<div class="m_7881526957566044995gmail-HOEnZb">
<div
class="m_7881526957566044995gmail-h5"><br>
--<br>
Francesco Romani<br>
Red Hat Engineering Virtualization R & D<br>
IRC: fromani<br>
<br>
</div>
</div>
</blockquote>
</span></div>
<br>
</div>
</div>
</blockquote>
</div>
<br>
</div>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
Francesco Romani
Red Hat Engineering Virtualization R & D
IRC: fromani</pre>
</body>
</html>
--------------E85C2B9AFE0A650E0EA7DD1A--
11:17 a.m.
New subject: [monitoring][collectd] the collectd virt plugin is now on par with Vdsm needs
+Yaniv Dary <ydary(a)redhat.com> can you help with a gap analysis to
understand what values we expecet as RAW and not supplied by collectd?
On Mon, Mar 13, 2017 at 9:45 AM Francesco Romani <fromani(a)redhat.com> wrote:
No updates yet. I'll move forward filing a github issue, hoping
to gather
more feedback.
Bests,
On 03/12/2017 03:38 PM, Yaniv Dary wrote:
Any updates on the usage of collectd with rates?
Yaniv Dary
Technical Product Manager
Red Hat Israel Ltd.
34 Jerusalem Road
Building A, 4th floor
Ra'anana, Israel 4350109
Tel : +972 (9) 7692306 <+972%209-769-2306>
8272306
Email: ydary(a)redhat.com
IRC : ydary
On Tue, Feb 28, 2017 at 4:17 PM, Yaniv Dary <ydary(a)redhat.com> wrote:
Yaniv Dary
Technical Product Manager
Red Hat Israel Ltd.
34 Jerusalem Road
Building A, 4th floor
Ra'anana, Israel 4350109
Tel : +972 (9) 7692306 <+972%209-769-2306>
8272306
Email: ydary(a)redhat.com
IRC : ydary
On Tue, Feb 28, 2017 at 4:06 PM, Francesco Romani <fromani(a)redhat.com>
wrote:
On 02/28/2017 12:24 PM, Yaniv Dary wrote:
> We need good answers from them to why they do not support this use case.
> Maybe a github issue on the use case would get more attention. They
> should allow us to choose how to present and collect the data.
> Can you open one?
>
I can, and I will if I get no answer in few more days.
Meantime, among other things, I'm doing my homework to understand why
they do like that.
This is the best source of information I found so far (please check the
whole thread, it's pretty short):
https://mailman.verplant.org/pipermail/collectd/2013-September/005924.html
Quoting part of the email
"""
We only came up with one use case where having the raw counter values is
beneficial: If you want to calculate the average rate over arbitrary
time spans, it's easier to look up the raw counter values for those
points in time and go from there. However, you can also sum up the
individual rates to reach the same result. Finally, when handling
counter resets / overflows within this interval, integrating over /
summing rates is trivial by comparison.
Do you have any other use-case for raw counter values?
Pro:
* Handling of values becomes easier.
* The rate is calculated only once, in contrast to potentially several
times, which might be more efficient (currently each rate conversion
involves a lookup call).
* Together with (1), this removes the need for having the "types.db",
which could be removed then. We were in wild agreement that this
would be a worthwhile goal.
Not for adding units:
https://github.com/collectd/collectd/issues/2047
Contra:
* Original raw value is lost. It can be reconstructed except for a
(more or less) constant offset, though.
How is this done?
"""
Looks like this change was intentional and implemented after some
discussion.
I understand this, but most monitoring system will not know what to do
with this value.
Bests,
--
Francesco Romani
Red Hat Engineering Virtualization R & D
IRC: fromani
--
Francesco Romani
Red Hat Engineering Virtualization R & D
IRC: fromani
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