Re: Review Request 68054: Added networking statistics to cni isolator.

[Sergey Urbanovich <se...@gmail.com>]

> On July 28, 2018, 12:29 a.m., Jie Yu wrote:
> > src/slave/containerizer/mesos/isolators/network/cni/cni.cpp
> > Lines 1506-1507 (patched)
> > <https://reviews.apache.org/r/68054/diff/2/?file=2064856#file2064856line1506>
> >
> >     No need for this temp variable
> 
> Sergey Urbanovich wrote:
>     I got the following error without the temp variable. What would be the best way to use `lambda::bind()` in that case?
>     
>     ```
>     ../src/slave/containerizer/mesos/isolators/network/cni/cni.cpp:1513:26: error: no matching member function for call to 'run'
>       return namespaceRunner.run(netns, "net", lambda::bind(&NetworkCniIsolatorProcess::_usage, ifNames));
>              ~~~~~~~~~~~~~~~~^~~
>     ../src/linux/ns.hpp:210:22: note: candidate template ignored: could not match 'function' against '_Bind'
>       process::Future<T> run(
>                          ^
>     ```

The temp variable adds explicit type conversion. I've been trying to use `std::function<>` in ns.hpp, but got the same error for `lambda::bind()` and `std::bind()`:

```
../src/slave/containerizer/mesos/isolators/network/cni/cni.cpp:1514:26: error: no matching member function for call to 'run'
  return namespaceRunner.run(
         ~~~~~~~~~~~~~~~~^~~
../src/linux/ns.hpp:211:22: note: candidate template ignored: could not match 'function' against '_Bind'
  process::Future<T> run(
                     ^
```

For `std::function<>` and lambda expressions I got another error:

```
../src/slave/containerizer/mesos/isolators/network/cni/cni.cpp:1513:26: error: no matching member function for call to 'run'
  return namespaceRunner.run(netns, "net",
         ~~~~~~~~~~~~~~~~^~~
../src/linux/ns.hpp:211:22: note: candidate template ignored: could not match 'function<Try<type-parameter-0-0, Error> ()>' against '(lambda at ../src/slave/containerizer/mesos/isolators/network/cni/cni.cpp:1514:7)'
  process::Future<T> run(
                     ^
```


- Sergey


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On July 27, 2018, 11:36 p.m., Sergey Urbanovich wrote:
> 
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/68054/
> -----------------------------------------------------------
> 
> (Updated July 27, 2018, 11:36 p.m.)
> 
> 
> Review request for mesos, Jie Yu and Qian Zhang.
> 
> 
> Bugs: MESOS-5647
>     https://issues.apache.org/jira/browse/MESOS-5647
> 
> 
> Repository: mesos
> 
> 
> Description
> -------
> 
> On receiving a request for getting `usage` for a given container
> the `network/cni` isolator uses getifaddrs(3) glibc function. The
> function returns basic networking metrics for each networking
> interface in the container networking namespace. It should work
> right out of the box on all modern Linux-based systems.
> 
> To get more networking metrics please use Netlink Protocol Library.
> However, you will have to open NETLINK sockets in each networking
> namespace and manage them from the `network/cni` isolator.
> 
> JIRA: https://issues.apache.org/jira/browse/MESOS-5647
> 
> 
> Diffs
> -----
> 
>   src/slave/containerizer/mesos/isolators/network/cni/cni.hpp 31ec4ddb1049b7259b0784e5e40b002e29f6a8da 
>   src/slave/containerizer/mesos/isolators/network/cni/cni.cpp f46c962d8f044092aaa113fafc536c6b25bab45c 
>   src/tests/containerizer/cni_isolator_tests.cpp 90d2d4103c8136d2dd883318acc135f7efca80d8 
> 
> 
> Diff: https://reviews.apache.org/r/68054/diff/3/
> 
> 
> Testing
> -------
> 
> bin/mesos-tests.sh --verbose --gtest_filter="CniIsolatorTest.ROOT_VerifyResourceStatistics" --gtest_break_on_failure --gtest_repeat=100
> 
> 
> Thanks,
> 
> Sergey Urbanovich
> 
>