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authorRyota Mibu <r-mibu@cq.jp.nec.com>2017-09-11 13:06:26 +0000
committerGerrit Code Review <gerrit@opnfv.org>2017-09-11 13:06:26 +0000
commit5ffd957a87858e026011e4bbde9b493c62c11b8e (patch)
tree5c26f5e69db992424b4667bdd81bbb6579ef7a36
parentdfb3c066a1c325ba7ca028be98d9ec04af994f48 (diff)
parentf5a750f19896f6f161876a5babc5b42c720dedf8 (diff)
Merge "Add host specific VM list to inspector design guide line"
-rw-r--r--docs/development/design/inspector-design-guideline.rst19
1 files changed, 18 insertions, 1 deletions
diff --git a/docs/development/design/inspector-design-guideline.rst b/docs/development/design/inspector-design-guideline.rst
index 4add8c0..faa5e42 100644
--- a/docs/development/design/inspector-design-guideline.rst
+++ b/docs/development/design/inspector-design-guideline.rst
@@ -31,7 +31,24 @@ Guidelines
Host specific VMs list
----------------------
-TBD, see `DOCTOR-76`_.
+While requirement in doctor project is to have alarm about fault to consumer in one second, it is just a limit we have
+set in requirements. When talking about fault management in Telco, the implementation needs to be by all means optimal
+and the one second is far from traditional Telco requirements.
+
+One thing to be optimized in inspector is to eliminate the need to read list of host specific VMs from Nova API, when
+it gets a host specific failure event. Optimal way of implementation would be to initialize this list when Inspector
+start by reading from Nova API and after this list would be kept up-to-date by ``instance.update`` notifications
+received from nova. Polling Nova API can be used as a complementary channel to make snapshot of hosts and VMs list in
+order to keep the data consistent with reality.
+
+This is enhancement and not perhaps something needed to keep under one second in a small system. Anyhow this would be
+something needed in case of production use.
+
+This guideline can be summarized as following:
+
+- cache the host VMs mapping instead of reading it on request
+- subscribe and handle update notifications to keep the list up to date
+- make snapshot periodically to ensure data consistency
Parallel execution
------------------