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Ben, I like the refactor you've done. A special thanks goes for updating 
comments for clarity and brevity. Below are my 2ยข on naming.

In general, the naming of executors and executor drivers in our codebase is a 
bit ambiguous. We have basic executor that lives in `exec.cpp` which is usually 
called the "executor driver", but we also have the executor driver, say 
`MesosExecutorDriver`, which is not relevant here. Therefore I can't decide 
what is the best name for the timeout that lives in `exec.cpp`, I opted for 
`ExecGracePeriod`, you for `ExecutorDriverGracePeriod`. Maybe we can come up 
with a better, less ambigouos name?

Again, `ExecutorGracePeriod` IMO doesn't reflect that this timeout lives in 
containerizer. The innermost timeout, which you renamed to 
`CommandExecutorGracePeriod`, can be in theory used by other "real" executors, 
that's why I gave it a more general name. But most probably custom executors 
will use the parameter from `ExecutorInfo`, so let's leave 
`CommandExecutorGracePeriod`.


src/slave/graceful_shutdown.hpp
<https://reviews.apache.org/r/30580/#comment116414>

    This is not necessary here: we take `Duration` as a function parameter, 
which means the caller already has access to `Duration`; and we do not 
manipulate `Duration` instances. An include in `.cpp` suffices.



src/slave/graceful_shutdown.cpp
<https://reviews.apache.org/r/30580/#comment116417>

    I think a `CHECK` is too strong. It would be nice to have validation in 
flags loading functionality, though.


- Alexander Rukletsov


On Feb. 4, 2015, 2:14 a.m., Ben Mahler wrote:
> 
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/30580/
> -----------------------------------------------------------
> 
> (Updated Feb. 4, 2015, 2:14 a.m.)
> 
> 
> Review request for mesos, Alexander Rukletsov, Niklas Nielsen, and Vinod Kone.
> 
> 
> Repository: mesos
> 
> 
> Description
> -------
> 
> This is a pure cleanup to clarify the documentation and naming around 
> graceful shutdown.
> 
> Note that I also namespaced the methods differently.
> 
> 
> Diffs
> -----
> 
>   src/exec/exec.cpp aada24664dba9060a92230e25689c89852585443 
>   src/launcher/executor.cpp 1cf28f168cac6e8c7e98686a35509c2b4e052504 
>   src/slave/constants.hpp 761cfafb3b1b342af4d1dbdb2dec39a45dd62794 
>   src/slave/flags.hpp 0f6cc41d60a2e3bc2121cc438351135541ef99ba 
>   src/slave/graceful_shutdown.hpp 59f5cfba032a81b5f69c2dd1bc1d96527686127c 
>   src/slave/graceful_shutdown.cpp 04d8f091dfc5a007ac46ccc91c7ff7bfe620b524 
>   src/slave/slave.cpp a8b262174ab5c9a524db8318d3d1438cd75a702b 
>   src/tests/gc_tests.cpp 454f0974833ad5db8b504a36b010cc72c3a19751 
>   src/tests/slave_tests.cpp e7e2af63da785644f3f7e6e23607c02be962a2c6 
> 
> Diff: https://reviews.apache.org/r/30580/diff/
> 
> 
> Testing
> -------
> 
> make check
> 
> 
> Thanks,
> 
> Ben Mahler
> 
>

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