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From Thomas Rampelberg <tho...@saunter.org>
Subject Re: Python bindings are changing!
Date Thu, 14 Aug 2014 23:46:53 GMT
There is one important step to do during the upgrade:

- Upgrade your python framework and executor. You'll be able to either
import using the new configuration or the old. Replace the existing
imports with this:

    try:
        from mesos.native import MesosExecutorDriver, MesosSchedulerDriver
        from mesos.interface import Executor, Scheduler
        from mesos.interface import mesos_pb2
    except ImportError:
        from mesos import Executor, MesosExecutorDriver,
MesosSchedulerDriver, Scheduler
        import mesos_pb2

Then, you'll be able to follow the normal upgrade instructions.
Following the ones from the 0.18.x -> 0.19.x instructions:

- Install the new master binaries and restart the masters.
- Install the new slave binaries and restart the slaves.
- Upgrade the schedulers by installing the latest python egg.
- Restart the schedulers.
- Upgrade the executors by installing the latest python egg.

On Wed, Aug 13, 2014 at 10:19 AM, Jie Yu <yujie.jay@gmail.com> wrote:
> Thomas,
>
> We are about to cut the 0.20.0 release. I am updating the docs/upgrades.md.
> Regarding the python binding change, can you let us know the exact deploy
> procedure if someone is using the old python binding?
>
> More specifically, say all masters/slaves/executors/schedulers are using
> 0.19.1. What should we upgrade first? For example
> 1) If we upgrade the slaves first (libmesos.so will be updated), what
> happens if the new slave launches an old executor? (here, you actually have
> two cases: a) the executor bundles libmesos.so; b) the execute does not
> bundle libmesos.so)
> 2) Same question for framework, which one should we upgrade first (scheduler
> or master)?
>
> Also, would you please test all these scenarios so that we can provide
> correct guidance to the community. Thanks a lot!
>
> - Jie
>
>
> On Sun, Aug 3, 2014 at 11:18 PM, Benjamin Mahler <benjamin.mahler@gmail.com>
> wrote:
>>>
>>> It might work to use
>>> 0.19 with a 0.20 mesos (or visa versa), but there be dragons =)
>>
>>
>> Is there a deprecation cycle? How should folks be upgrading Python
>> schedulers
>> and executors to 0.20.0 if they are not statically bundling libmesos?
>> Is there an upgrade order required?
>>
>> We will need to document this carefully in the upgrade procedures for
>> 0.20.0.
>>
>> Thanks for cleaning this up Thomas! Appreciate it.
>>
>> On Sat, Aug 2, 2014 at 12:12 PM, Thomas Rampelberg <thomas@saunter.org>
>> wrote:
>>>
>>> You'll want to match the python bindings to your mesos version as the
>>> functionality is coming from libmesos itself. It might work to use
>>> 0.19 with a 0.20 mesos (or visa versa), but there be dragons =)
>>>
>>>
>>> On Fri, Aug 1, 2014 at 1:30 PM, Jie Yu <yujie.jay@gmail.com> wrote:
>>> > Thomas,
>>> >
>>> > Thank you for the heads-up. One question: what if mesos and python
>>> > binding
>>> > have different versions? For example, is it ok to use a 0.19.0 python
>>> > binding and having a 0.20.0 mesos? Same question for the reverse.
>>> >
>>> > - Jie
>>> >
>>> >
>>> > On Fri, Aug 1, 2014 at 9:37 AM, Thomas Rampelberg <thomas@saunter.org>
>>> > wrote:
>>> >
>>> >> - What problem are we trying to solve?
>>> >>
>>> >> Currently, the python bindings group protobufs, stub implementations
>>> >> and compiled code into a single python package that cannot be
>>> >> distributed easily. This forces python projects using mesos to copy
>>> >> protobufs around and forces a onerous dependency on anyone who would
>>> >> like to do a pure python binding.
>>> >>
>>> >> - How was this problem solved?
>>> >>
>>> >> The current python package has been split into two separate packages:
>>> >>
>>> >> - mesos.interface (stub implementations and protobufs)
>>> >> - mesos.native (old _mesos module)
>>> >>
>>> >> These are python meta-packages and can be installed as separate
>>> >> pieces. The `mesos.interface` package will be hosted on pypi and can
>>> >> be installed via. easy_install and pip.
>>> >>
>>> >> See https://issues.apache.org/jira/browse/MESOS-857 and
>>> >> https://reviews.apache.org/r/23224/.
>>> >>
>>> >> - Why should I care?
>>> >>
>>> >> These changes are not backwards compatible. With 0.20.0 you will need
>>> >> to change how you use the python bindings. Here's a quick overview:
>>> >>
>>> >>     mesos.Scheduler -> mesos.interface.Scheduler
>>> >>     mesos.mesos_pb2 -> mesos.interface.mesos_pb2
>>> >>     mesos.MesosSchedulerDriver -> mesos.native.MesosSchedulerDriver
>>> >>
>>> >> For more details, you can take a look at the examples in
>>> >> `src/examples/python".
>>> >>
>>
>>
>

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