To: "user@cassandra.apache.org"
Subject: Measuring Cassandra Metrics at a Sessions/Connection Levels
Message from External Sender
Hi all ...
We are facing a scenario where we have to measure for some metrics on a per
connection or client basis. For example. count of read/write reques
Hi all ...
We are facing a scenario where we have to measure for some metrics on a per
connection or client basis. For example. count of read/write request by
client IP/host/user/program. We want to know the source of C* requests for
budgeting, capacity planing, or charge-backs.
We are running 2.2
Anyone is aware of a blog/reference/doc that can give me step by step to
accomplish this? Appreciate the help. Thanks in advance!
Sushanta
ic – it depends on your chosen consistency
>> level to determine if writes will fail or succeed.
>>
>>
>>
>> *From:* Павел Сапежко [mailto:amelius0...@gmail.com]
>> *Sent:* Friday, July 07, 2017 8:23 AM
>> *To:* user@cassandra.apache.org
>> *S
consistency
> level to determine if writes will fail or succeed.
>
>
>
> *From:* Павел Сапежко [mailto:amelius0...@gmail.com]
> *Sent:* Friday, July 07, 2017 8:23 AM
> *To:* user@cassandra.apache.org
> *Subject:* Re: Understanding of cassandra metrics
>
>
>
> Are yo
[mailto:amelius0...@gmail.com]
Sent: Friday, July 07, 2017 8:23 AM
To: user@cassandra.apache.org
Subject: Re: Understanding of cassandra metrics
Are you really think that I don't read docs? Do you have enough information in
the documentation? I think no. What exactly does mean CoordinatorScanLa
t;
>> Hello, I have several question about cassandra metrics. What does exactly
>> mean the next metrics:
>>
>>- CoordinatorReadLatency
>>- CoordinatorScanLatency
>>- ReadLatency
>>- RangeLatency
>>- ViewLockAcquireTime
>>
1st result on google returns:
http://cassandra.apache.org/doc/latest/operating/metrics.html
On Fri, Jul 7, 2017 at 12:16 PM, Павел Сапежко
wrote:
> Hello, I have several question about cassandra metrics. What does exactly
> mean the next metrics:
>
>- Coordinato
Hello, I have several question about cassandra metrics. What does exactly
mean the next metrics:
- CoordinatorReadLatency
- CoordinatorScanLatency
- ReadLatency
- RangeLatency
- ViewLockAcquireTime
- ViewReadTime
--
С уважением,
Павел Сапежко
skype: p.sapezhko
t;> in the prevelance of HT and you see a lot of 24+ flush writer
>>>> systems in the wild)
>>>>
>>>> No disrespect intended but that default hasn't worked out well at
>>>> all in my exposure to it, and 0.6 has never been worse than the
>>
at all in
>>> my exposure to it, and 0.6 has never been worse than the default yet.
>>> Obviously write patterns, heap configuration, memtable size limits and what
>>> not affect the exact optimal setting and I've rarely had it end up 0.6
>>> after a tuning exercise. I nev
6 after a tuning
exercise. I never intended that as a blanket recommendation, just a starting
one.
_
From: Benedict Elliott Smith <bened...@apache.org>
Sent: Friday, August 26, 2016 9:40 AM
Subject: Re: Guidelines for configuring Thresholds for Cassandra met
Elliott Smith
Sent: Friday, August 26, 2016 9:40 AM
Subject: Re: Guidelines for configuring Thresholds for Cassandra metrics
To:
The default when I wrote it was 0.4 but it was found this did not saturate
flush writers in JBOD configurations. Iirc it now defaults to 1/(1+#disks)
which is not a
e. I never intended that as a blanket recommendation,
> just a starting one.
>
> _
> From: Benedict Elliott Smith >
> Sent: Friday, August 26, 2016 9:40 AM
> Subject: Re: Guidelines for configuring Thresholds for Cassandra metrics
> To: >
>
>
> The default when I wrote
etting and I've rarely had it end up 0.6 after a tuning
exercise. I never intended that as a blanket recommendation, just a starting
one.
_
From: Benedict Elliott Smith
Sent: Friday, August 26, 2016 9:40 AM
Subject: Re: Guidelines for configuring Thre
The default when I wrote it was 0.4 but it was found this did not saturate
flush writers in JBOD configurations. Iirc it now defaults to 1/(1+#disks)
which is not a terrible default, but obviously comes out much lower if you
have many disks.
This smaller value behaves better for peak performance,
Forgot the most important thing. LogsERROR you should investigateWARN you
should have a list of known ones. Use case dependent. Ideally you change
configuration accordingly.*PoolCleaner (slab or native) - good indication node
is tuned badly if you see a ton of this. Set memtable_cleanup_thresho
Thomas,
Not all metrics are KPIs and are only useful when researching a specific issue
or after a use case specific threshold has been set.
The main "canaries" I monitor are:* Pending compactions (dependent on the
compaction strategy chosen but 1000 is a sign of severe issues in all cases)*
drop
Hello,
I am working on setting up a monitoring tool to monitor Cassandra Instances.
Are there any wikis which specifies optimum value for each Cassandra KPIs?
For instance, I am not sure,
What value of "Memtable Columns Count" can be considered as "Normal".
What value of the same has to be
This isn't a direct answer to your question, but jolokia (
https://jolokia.org/) may be a useful alternative. It runs as an agent
attached to your cassandra process and provides a REST API for JMX.
On Tue, Jul 19, 2016 at 11:19 AM, Ricardo Sancho
wrote:
> Is anyone using a custom reporter to pl
Is anyone using a custom reporter to plugin to their own monitoring
systems?
ie one that does not use graphite or something for which a reporter exists.
Any documentation on plugging this in?
We have a custom reporter, it's been loaded and we see report method being
called. But when we iterate the
ed using Cassandra. As of now, I am only using
> cfstats and cfhistograms to monitor individual CF stats. What all cassandra
> metrics should I watch for stability and performance? Are there any tools
> to do the same? Is there any performance overhead if I start monitoring too
> many metrics?
> >
> > Thanks
> > - Saurabh
>
tograms to monitor individual CF stats. What all cassandra metrics
> should I watch for stability and performance? Are there any tools to do the
> same? Is there any performance overhead if I start monitoring too many
> metrics?
>
> Thanks
> - Saurabh
: user@cassandra.apache.org
Objet : Cassandra Metrics
Hi,
I have recently started using Cassandra. As of now, I am only using cfstats and
cfhistograms to monitor individual CF stats. What all cassandra metrics should
I watch for stability and performance? Are there any tools to do the same? Is
Hi,
I have recently started using Cassandra. As of now, I am only using cfstats
and cfhistograms to monitor individual CF stats. What all cassandra metrics
should I watch for stability and performance? Are there any tools to do the
same? Is there any performance overhead if I start monitoring too
Many thanks for information Dennis and Karl.
I don’t think I can test until Monday, but I will let you know what (hopefully)
works.
Regards
Nigel
From: d...@aegisco.com [mailto:d...@aegisco.com]
Sent: 17 December 2014 22:31
To: user@cassandra.apache.org
Subject: Re: Cassandra metrics
>
>
> > On Dec 17, 2014, at 11:04 AM, Nigel LEACH
> wrote:
> >
> > I'm running Cassandra Cassandra 2.0.11.83 (via DSE 4.6.0), and Graphite
> 0.9.10. I know a bit about Cassandra, but not much about Graphite.
> >
> > Our Graphite server exposes system
t; wrote:
>
> I'm running Cassandra Cassandra 2.0.11.83 (via DSE 4.6.0), and Graphite
> 0.9.10. I know a bit about Cassandra, but not much about Graphite.
>
> Our Graphite server exposes system metrics, and also those from the example
> python scripts, successfully.
>
>
I'm running Cassandra Cassandra 2.0.11.83 (via DSE 4.6.0), and Graphite 0.9.10.
I know a bit about Cassandra, but not much about Graphite.
Our Graphite server exposes system metrics, and also those from the example
python scripts, successfully.
I can see Cassandra metrics hitting the Gra
On Thu, Aug 28, 2014 at 3:39 PM, Donald Smith <
donald.sm...@audiencescience.com> wrote:
> Maybe there’s a way to reset lifetime metrics to zero.
No. [1]
=Rob
[1] At least, they never have before and neither driftx or I believe they
have been created.
3:56 PM
To: user@cassandra.apache.org
Subject: Re: How often are JMX Cassandra metrics reset?
In the version of metrics used theres a uniform reservoir and a exponentially
weighted one. This is used to compute the min, max, mean, std dev and
quantiles. For the timers it uses by default it use
t; Min = 95.64
> StdDev = 3,034.62
> 75thPercentile = 626.34
> 95thPercentile = 954.31
> 98thPercentile = 1,443.11
> 99thPercentile = 1,472.4
> 999thPercentile = 1,858.1
>
>
> From: Nick Bailey [mailto:n...@datastax.com]
> Sent: Thursd
@cassandra.apache.org
Subject: Re: How often are JMX Cassandra metrics reset?
Those percentile values should be for the lifetime of the node yes. Depending
on what version of OpsCenter you are using it is either using the 'recent'
metrics described by Rob, or it is using the FiveMinuteRate from J
Those percentile values should be for the lifetime of the node yes.
Depending on what version of OpsCenter you are using it is either using the
'recent' metrics described by Rob, or it is using the FiveMinuteRate from
JMX as well as doing some of it's own aggregation depending on the rollup
size.
On Thu, Aug 28, 2014 at 9:27 AM, Donald Smith <
donald.sm...@audiencescience.com> wrote:
> And yet OpsCenter shows graphs with ever-changing metrics that show
> recent performance. Does OpsCenter not get its stats from JMX?
>
1) Certain JMX endpoints expose "recent" metrics, or at least used to.
metrics reset?
On Wed, Aug 27, 2014 at 12:38 PM, Donald Smith
mailto:donald.sm...@audiencescience.com>>
wrote:
I’m using JMX to retrieve Cassandra metrics. I notice that Max and Count are
cumulative and aren’t reset.How often are the stats for Mean,
99tthPercentile, etc reset back t
On Wed, Aug 27, 2014 at 12:38 PM, Donald Smith <
donald.sm...@audiencescience.com> wrote:
> I’m using JMX to retrieve Cassandra metrics. I notice that Max and
> Count are cumulative and aren’t reset.How often are the stats for Mean,
> 99tthPercentile, etc reset back to zero
I'm using JMX to retrieve Cassandra metrics. I notice that Max and Count are
cumulative and aren't reset.How often are the stats for Mean,
99tthPercentile, etc reset back to zero?
For example, 99thPercentile shows as 1.5 mls. Over how many minutes?
ClientRequest/Re
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