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Posted to user@flink.apache.org by Avi Levi <av...@bluevoyant.com> on 2019/03/10 11:41:51 UTC

estimate number of keys on rocks db

Hi,
I am trying to estimate number of keys at a given minute.
I created a graph based on avg_over_time
<https://prometheus.io/docs/prometheus/latest/querying/functions/#aggregation_over_time>
with
1hr and 5m interval. looking at the graph you can see that it has high
spikes which doesn't make sense (IMO) how can the average have those spikes
? after all since I do not delete keys I would expect to go up or remain
the same.
any ideas what can explain such behaviour ?
attached are graphs 5m and 1 h intervals
[image: Screen Shot 2019-03-10 at 13.37.44.png]
[image: Screen Shot 2019-03-10 at 13.33.40.png]

Re: estimate number of keys on rocks db

Posted by Avi Levi <av...@bluevoyant.com>.

Thanks Yun,
Attached. Please let me know if it is ok.
I made several trials including aggregation functions but couldn't figure
out why the line is not going straight up and why having those picks .



On Sun, Mar 10, 2019 at 4:49 PM Yun Tang <my...@live.com> wrote:

> Hi Avi
>
> Unfortunately, we cannot see the attached images. By the way, did you ever
> use window in this job?
>
> Best
> Yun Tang
> ------------------------------
> *From:* Avi Levi <av...@bluevoyant.com>
> *Sent:* Sunday, March 10, 2019 19:41
> *To:* user
> *Subject:* estimate number of keys on rocks db
>
> Hi,
> I am trying to estimate number of keys at a given minute.
> I created a graph based on avg_over_time
> <https://prometheus.io/docs/prometheus/latest/querying/functions/#aggregation_over_time> with
> 1hr and 5m interval. looking at the graph you can see that it has high
> spikes which doesn't make sense (IMO) how can the average have those spikes
> ? after all since I do not delete keys I would expect to go up or remain
> the same.
> any ideas what can explain such behaviour ?
> attached are graphs 5m and 1 h intervals
> [image: Screen Shot 2019-03-10 at 13.37.44.png]
> [image: Screen Shot 2019-03-10 at 13.33.40.png]
>
>
>
>

Re: estimate number of keys on rocks db

Posted by Yun Tang <my...@live.com>.

Hi Avi

Unfortunately, we cannot see the attached images. By the way, did you ever use window in this job?

Best
Yun Tang
________________________________
From: Avi Levi <av...@bluevoyant.com>
Sent: Sunday, March 10, 2019 19:41
To: user
Subject: estimate number of keys on rocks db

Hi,
I am trying to estimate number of keys at a given minute.
I created a graph based on avg_over_time<https://prometheus.io/docs/prometheus/latest/querying/functions/#aggregation_over_time> with 1hr and 5m interval. looking at the graph you can see that it has high spikes which doesn't make sense (IMO) how can the average have those spikes ? after all since I do not delete keys I would expect to go up or remain the same.
any ideas what can explain such behaviour ?
attached are graphs 5m and 1 h intervals
[Screen Shot 2019-03-10 at 13.37.44.png]
[Screen Shot 2019-03-10 at 13.33.40.png]