openstack
/
nova
Code Issues Proposed changes

Expand on when you might want to set --max-count for map_instances 

The default behavior for the "nova-manage cell_v2 map_instances"
command is to map all instances in the cell in batches of 50.

This can be slow when there are several thousand instances in the
deployment and an operator may want to specify a higher --max-count
value and run the command until it completes.

This simply updates the command option description and man page to
point this out for consideration.

Change-Id: I59c2ed89fe02212977445f6825c6da8fedbb8ccf
Related-Bug: #1742649
This commit is contained in:
Matt Riedemann 2018-01-23 15:30:47 -05:00
parent 27eadbc499
commit 2890d8db67
2 changed files with 8 additions and 1 deletions
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4
doc/source/cli/nova-manage.rst
View File

@ -152,6 +152,10 @@ Nova Cells v2
instances have been mapped, and 1 if there are still instances to be
mapped.
If ``--max-count`` is not specified, all instances in the cell will be
mapped in batches of 50. If you have a large number of instances, consider
specifying a custom value and run the command until it exits with 0.
``nova-manage cell_v2 map_cell_and_hosts [--name <cell_name>] [--transport-url <transport_url>] [--verbose]``
Create a cell mapping to the database connection and message queue

5
nova/cmd/manage.py
View File

@ -1073,7 +1073,10 @@ class CellV2Commands(object):
help='Unmigrated instances will be mapped to the cell with the '
'uuid provided.')
@args('--max-count', metavar='<max_count>', dest='max_count',
help='Maximum number of instances to map')
help='Maximum number of instances to map. If not set, all instances '
'in the cell will be mapped in batches of 50. If you have a '
'large number of instances, consider specifying a custom value '
'and run the command until it exits with 0.')
def map_instances(self, cell_uuid, max_count=None):
"""Map instances into the provided cell.