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From Neil Conway <neil.con...@gmail.com>
Subject Re: Review Request 51021: Added GC of unreachable agent metadata from the registry.
Date Tue, 13 Sep 2016 12:37:19 GMT


> On Sept. 12, 2016, 10:52 p.m., Vinod Kone wrote:
> > src/master/flags.cpp, line 571
> > <https://reviews.apache.org/r/51021/diff/5/?file=1496749#file1496749line571>
> >
> >     do we want to enforce that `registry_max_agent_age` is >= `registry_gc_interval`?
otherwise, users might be confused why old agents are not being GC'ed?

I considered this. I ended up not doing it because it seemed like additional complexity to
explain to users why certain configuration values are illegal. Configuring `registry_max_agent_age`
to be smaller than `registry_gc_interval` certainly seems like an usual configuration, but
it doesn't seem *wrong* or harmful, so I thought I'd allow it. Let me know if disagree.


- Neil


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On Sept. 12, 2016, 1:48 p.m., Neil Conway wrote:
> 
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/51021/
> -----------------------------------------------------------
> 
> (Updated Sept. 12, 2016, 1:48 p.m.)
> 
> 
> Review request for mesos and Vinod Kone.
> 
> 
> Bugs: MESOS-5965
>     https://issues.apache.org/jira/browse/MESOS-5965
> 
> 
> Repository: mesos
> 
> 
> Description
> -------
> 
> Information about agents that have been marked unreachable is stored
> in the registry. Since the number of unreachable agents can grow without
> bound, this commit implements a garbage collection scheme. The current
> leading master will periodically examine the registry and discard
> information about unreachable agents according to two criteria:
> `registry_max_agent_age` and `registry_max_agent_count`. The frequency
> with which the master examines the registry is controlled by a third
> parameter, `registry_gc_interval`.
> 
> 
> Diffs
> -----
> 
>   src/master/constants.hpp cd80dace80968a1f67a8de5b2c112fb1396e26aa 
>   src/master/flags.hpp c6e85303f60387f42b5e187eaedb6a01000f948f 
>   src/master/flags.cpp 19ae6c1c30a1054b64a9585f325bd0bf943af218 
>   src/master/master.hpp 4992ab0a0bb5babbf6a4fa3e6eff3577590fc879 
>   src/master/master.cpp 1dcce6cd66804990af238176c61aca03bb5c9471 
>   src/master/registry.proto 03c896c39458b54b3966ce32c45eaa33c890ed28 
>   src/tests/partition_tests.cpp f3142ad8d50daafcdb70ad9dbb2772f8ba30db00 
>   src/tests/registrar_tests.cpp b04fc92c66449f1094212a534899e16d5f6f01bd 
> 
> Diff: https://reviews.apache.org/r/51021/diff/
> 
> 
> Testing
> -------
> 
> make check
> 
> 
> Thanks,
> 
> Neil Conway
> 
>


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