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Add 'CDIST_ORDER_DEPENDENCY kills parallelization'

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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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45
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*. 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 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` things you are assuring that remote host has packages `sudo` and `curl`
installed. installed.
@ -316,3 +320,44 @@ Then, in init manifest you combine your complex types. It is:
* easier to follow * easier to follow
* easier to maintain * easier to maintain
* easier to debug. * 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