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Add 'CDIST_ORDER_DEPENDENCY kills parallelization'

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This commit is contained in:
Darko Poljak 2019-05-06 17:11:23 +02:00
parent 28082c710a
commit 02eb6c75a7
1 changed files with 45 additions and 0 deletions
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docs/src/cdist-best-practice.rst
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@ -237,6 +237,10 @@ It essentially helps you to build up blocks of code that build upon each other
This can be helpful, but it can also be the source of *evil*.
CDIST_ORDER_DEPENDENCY easily causes unobvious dependency cycles
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Let's see an example. Suppose you have special init manifest where among other
things you are assuring that remote host has packages `sudo` and `curl`
installed.
@ -316,3 +320,44 @@ Then, in init manifest you combine your complex types. It is:
* easier to follow
* easier to maintain
* easier to debug.
CDIST_ORDER_DEPENDENCY kills parallelization
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Suppose you have defined CDIST_ORDER_DEPENDENCY and then, among other things,
you specify creation of three, by nature independent, files.
**init**
.. code-block:: sh
CDIST_ORDER_DEPENDENCY=1
export CDIST_ORDER_DEPENDENCY
...
__file /tmp/file1
__file /tmp/file2
__file /tmp/file3
...
Due to defined CDIST_ORDER_DEPENDENCY cdist will execute them in specified order.
It is better to use CDIST_ORDER_DEPENDENCY in well defined blocks:
**init**
.. code-block:: sh
CDIST_ORDER_DEPENDENCY=1
export CDIST_ORDER_DEPENDENCY
...
unset CDIST_ORDER_DEPENDENCY
__file /tmp/file1
__file /tmp/file2
__file /tmp/file3
CDIST_ORDER_DEPENDENCY=1
export CDIST_ORDER_DEPENDENCY
...
unset CDIST_ORDER_DEPENDENCY