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doc/mgr: Add limitations section to plugin guide #21347

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Apr 11, 2018
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doc/mgr: Add limitations section to plugin guide #21347

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9 changes: 9 additions & 0 deletions doc/mgr/plugins.rst
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Expand Up @@ -193,6 +193,15 @@ If a module implements the ``serve()`` method, it should also implement
the ``shutdown()`` method to shutdown cleanly: misbehaving modules
may otherwise prevent clean shutdown of ceph-mgr.

Limitations
-----------

It is not possible to call back into C++ code from a module's
``__init__()`` method. For example calling ``self.get_config()`` at
this point will result in an assertion failure in ceph-mgr. For modules
that implement the ``serve()`` method, it usually makes sense to do most
initialization inside that method instead.

Is something missing?
---------------------

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