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From Reza Motamedi <reza.motam...@gmail.com>
Subject Re: Review Request 60376: Observer task page to load consumption info from history
Date Tue, 18 Jul 2017 06:26:41 GMT


> On July 18, 2017, 12:46 a.m., Santhosh Kumar Shanmugham wrote:
> > src/main/python/apache/thermos/monitoring/resource.py
> > Line 54 (original), 53-60 (patched)
> > <https://reviews.apache.org/r/60376/diff/3/?file=1766459#file1766459line54>
> >
> >     Can you add some docstrings to these classes to explain what they will contain?
Particularly the difference between the `AggregateResourceResult` and `(Proc|Full)ResourceResult`.

Done.


> On July 18, 2017, 12:46 a.m., Santhosh Kumar Shanmugham wrote:
> > src/main/python/apache/thermos/monitoring/resource.py
> > Line 61 (original), 67 (patched)
> > <https://reviews.apache.org/r/60376/diff/3/?file=1766459#file1766459line68>
> >
> >     Update docstring.

Done.


> On July 18, 2017, 12:46 a.m., Santhosh Kumar Shanmugham wrote:
> > src/main/python/apache/thermos/monitoring/resource.py
> > Line 68 (original), 74 (patched)
> > <https://reviews.apache.org/r/60376/diff/3/?file=1766459#file1766459line75>
> >
> >     Update docstring.

Done.


> On July 18, 2017, 12:46 a.m., Santhosh Kumar Shanmugham wrote:
> > src/main/python/apache/thermos/monitoring/resource.py
> > Lines 88 (patched)
> > <https://reviews.apache.org/r/60376/diff/3/?file=1766459#file1766459line89>
> >
> >     snake-case the field names.

Done.


> On July 18, 2017, 12:46 a.m., Santhosh Kumar Shanmugham wrote:
> > src/main/python/apache/thermos/monitoring/resource.py
> > Lines 175-179 (patched)
> > <https://reviews.apache.org/r/60376/diff/3/?file=1766459#file1766459line181>
> >
> >     Can we use `sum` and `zip` to sum the tuples column-wise?

Not sure if that makes it easier to read. I moved to something that matches what this part
of the calculation looked like before:

```
    aggregated_procs = sum(map(attrgetter('num_procs'), full_resources.proc_usage.values()))
    aggregated_sample = sum(map(attrgetter('process_sample'), full_resources.proc_usage.values()),
        ProcessSample.empty())
```


> On July 18, 2017, 12:46 a.m., Santhosh Kumar Shanmugham wrote:
> > src/test/python/apache/thermos/monitoring/test_resource.py
> > Lines 104-105 (patched)
> > <https://reviews.apache.org/r/60376/diff/3/?file=1766461#file1766461line106>
> >
> >     Feed some random values.

done.


> On July 18, 2017, 12:46 a.m., Santhosh Kumar Shanmugham wrote:
> > src/test/python/apache/thermos/monitoring/test_resource.py
> > Lines 113 (patched)
> > <https://reviews.apache.org/r/60376/diff/3/?file=1766461#file1766461line115>
> >
> >     Assert disk_usage.

done.


- Reza


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https://reviews.apache.org/r/60376/#review180775
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On July 18, 2017, 6:26 a.m., Reza Motamedi wrote:
> 
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/60376/
> -----------------------------------------------------------
> 
> (Updated July 18, 2017, 6:26 a.m.)
> 
> 
> Review request for Aurora, David McLaughlin, Joshua Cohen, Jordan Ly, and Santhosh Kumar
Shanmugham.
> 
> 
> Repository: aurora
> 
> 
> Description
> -------
> 
> # Observer task page to load consumption info from history
> 
> Resource consumptions of Thermos Processes are periodically calculated by TaskResourceMonitor
threads (one thread per Thermos task). This information is used to display a (semi) fresh
state of the tasks running on a host in the Observer host page, aka landing page. An aggregate
history of the consumptions is kept at the task level, although TaskResourceMonitor needs
to first collect the resource at the Process level and then aggregate them.
> 
> On the other hand, when an Observer _task page_ is visited, the resources consumption
of Thermos Processes within that task are calculated again and displayed without being aggregated.
This can become very slow since time to complete resource calculation is affected by the load
on the host.
> 
> By applying this patch we take advantage of the periodic work and fulfill information
resource requested in Observer task page from already collected resource consumptions.
> 
> 
> Diffs
> -----
> 
>   src/main/python/apache/thermos/monitoring/resource.py 434666696e600a0e6c19edd986c86575539976f2

>   src/test/python/apache/aurora/executor/common/test_resource_manager.py a898e4d81d34d1e30e39db1be1a66bc9e0ab1a35

>   src/test/python/apache/thermos/monitoring/test_resource.py d794a998f1d9fc52ba260cd31ac444aee7f8ed28

> 
> 
> Diff: https://reviews.apache.org/r/60376/diff/4/
> 
> 
> Testing
> -------
> 
> I stress tested this patch on a host that had a slow Observer page. Interestingly, I
did not need to do much to make the Observer slow. There are a few points to be made clear
first.
> - We at Twitter limit the resources allocated to the Observer using `systemd`. The observer
is allowed to use only 20% of a CPU core. The attached screen shots are from such a setup.
> - Having assigned 20% of a cpu core to Observer, starting only 8 `task`s, each with 3
`process`es is enough to make the Observer slow; 11secs to load `task page`.
> 
> 
> File Attachments
> ----------------
> 
> without the patch -- Screen Shot 2017-06-22 at 1.11.12 PM.png
>   https://reviews.apache.org/media/uploaded/files/2017/06/22/03968028-a2f5-4a99-ba57-b7a41c471436__without_the_patch_--_Screen_Shot_2017-06-22_at_1.11.12_PM.png
> with the patch -- Screen Shot 2017-06-22 at 1.07.41 PM.png
>   https://reviews.apache.org/media/uploaded/files/2017/06/22/5962c018-27d3-4463-a277-f6ad48b7f2d7__with_the_patch_--_Screen_Shot_2017-06-22_at_1.07.41_PM.png
> 
> 
> Thanks,
> 
> Reza Motamedi
> 
>


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