openstack/nova
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Updates to scheduling workflow doc

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There are a few updates here:

1. Fix the size of one of the existing boxes to fit the text.
2. Add a note at the top that anything about alternatives is
   future work since that didn't merge in Pike.
3. Add a box to note the call from scheduler to placement to
   make the "claim".

Change-Id: I8b6468766f4924d009b2567fe71c2f5d2733a6e3
This commit is contained in:
Matt Riedemann 2017-08-28 18:34:16 -04:00
parent ab352afeb2
commit 30fad527b2
1 changed files with 7 additions and 2 deletions
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9
doc/source/reference/scheduling.rst
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@ -25,11 +25,15 @@ Overview
The scheduling process is described below. The scheduling process is described below.
.. note:: This is current as of the 16.0.0 Pike release. Any mention of
alternative hosts passed between the scheduler and conductor(s) is future
work.
.. actdiag:: .. actdiag::
actdiag { actdiag {
build-spec -> send-spec -> send-reqs -> query -> return-rps -> build-spec -> send-spec -> send-reqs -> query -> return-rps ->
create -> filter -> return-hosts -> send-hosts; create -> filter -> claim -> return-hosts -> send-hosts;
lane conductor { lane conductor {
label = "Conductor"; label = "Conductor";
@ -40,7 +44,7 @@ The scheduling process is described below.
lane scheduler { lane scheduler {
label = "Scheduler"; label = "Scheduler";
send-reqs [label = "Submit resource requirements to placement", height = 38]; send-reqs [label = "Submit resource requirements to placement", height = 64];
create [label = "Create a HostState object for each RP returned from Placement", height = 64]; create [label = "Create a HostState object for each RP returned from Placement", height = 64];
filter [label = "Filter and weigh results", height = 38]; filter [label = "Filter and weigh results", height = 38];
return-hosts [label = "Return a list of selected host & alternates, along with their allocations, to the conductor", height = 89]; return-hosts [label = "Return a list of selected host & alternates, along with their allocations, to the conductor", height = 89];
@ -50,6 +54,7 @@ The scheduling process is described below.
label = "Placement"; label = "Placement";
query [label = "Query to determine the RPs representing compute nodes to satisfy requirements", height = 64]; query [label = "Query to determine the RPs representing compute nodes to satisfy requirements", height = 64];
return-rps [label = "Return list of resource providers and their corresponding allocations to scheduler", height = 89]; return-rps [label = "Return list of resource providers and their corresponding allocations to scheduler", height = 89];
claim [label = "Create allocations against selected compute node", height = 64];
} }
} }