womax/nova
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Update cells v2 layout doc caveats for Queens

Browse Source 
The instance list performance and reschedules issues have
been fixed in Queens so this updates the caveats section
of the cells v2 layout doc to point out those changes since
Pike.

Change-Id: I882f185554b6d2781534fa93e41e5010ea3a641d
This commit is contained in:
Matt Riedemann
2018-02-04 12:03:27 -05:00
parent 38eb95384f
commit 4ac7ef26ce
1 changed files with 12 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
doc/source/user/cellsv2-layout.rst
+12 -2
View File
@@ -245,7 +245,9 @@ this limitation.
Caveats of a Multi-Cell deployment
----------------------------------
.. note: This information is correct as of the Pike release.
.. note:: This information is correct as of the Pike release. Where
improvements have been made or issues fixed, they are noted per
item.
Cross-cell instance migrations
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -271,6 +273,8 @@ independent of the actual cell being reachable.
Performance of listing instances
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. note:: This has been resolved in the Queens release [#]_.
With multiple cells, the instance list operation may not sort and
paginate results properly when crossing multiple cell
boundaries. Further, the performance of a sorted list operation will
@@ -317,7 +321,10 @@ implement some features without such connectivity. Thus, anything that
requires a so-called "upcall" will not function. This impacts the
following:
#. Instance reschedules during boot
#. Instance reschedules during boot and resize
.. note:: This has been resolved in the Queens release [#]_.
#. Instance affinity reporting from the compute nodes to scheduler
#. The late anti-affinity check
#. Querying host aggregates from the cell
@@ -359,3 +366,6 @@ case of boot from volume where the *nova-compute* service itself creates the
volume and must tell Cinder in which availability zone to create the volume.
Long-term, volume creation during boot from volume should be moved to the
top-level superconductor which would eliminate this AZ up-call check problem.
.. [#] https://blueprints.launchpad.net/nova/+spec/efficient-multi-cell-instance-list-and-sort
.. [#] https://specs.openstack.org/openstack/nova-specs/specs/queens/approved/return-alternate-hosts.html