Re: pg_num not being set to ceph.conf default when creating pool via python librados

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Hello Gregory,

 

Thanks for the quick response. Does this mean that the rados python library is out of date? create_pool in rados.py (https://github.com/ceph/ceph/blob/master/src/pybind/rados.py#L535) only requires a pool_name….doesn’t even offer pg_num as an optional argument.

 

Thank you,

-Jason

 

From: Gregory Farnum [mailto:greg@xxxxxxxxxxx]
Sent: Monday, January 26, 2015 10:09 AM
To: Jason Anderson; ceph-users@xxxxxxxxxxxxxx
Subject: Re: [ceph-users] pg_num not being set to ceph.conf default when creating pool via python librados

 

Just from memory, I think these values are only used for the initial pool creations when the cluster is first set up.

We have been moving for a while to making users specify pg_num explicitly on every pool create, and you should do so. :)
-Greg

On Mon, Jan 26, 2015 at 7:38 AM Jason Anderson <Jason.Anderson@xxxxxxxxxxxxxxxx> wrote:

Hello fellow Cephers,

 

I am running Ceph Giant on Centos 6.6 and am running into an issue where the create_pool() method in the librados python library isn't using ceph.conf's pg_num and pgp_num settings during pool creation.

 

My ceph.conf:

[global]

auth_service_required = cephx

filestore_xattr_use_omap = true

auth_client_required = cephx

auth_cluster_required = cephx

mon_host = 64.0.1.210,64.0.1.211

public_network = 64.0.1.192/26

mon_initial_members = MON05, MON06

fsid = 91eda869-9a34-4f74-8189-7d5fb6952f4a

osd pool default pg num = 256

osd pool default pgp num = 256

 

In python, using the above ceph.conf, conf_get returns the correct pg_num and I am able to create the pool.

[root@DCOS01 lib]# python

>>> import rados

>>> cluster = rados.Rados(conffile='/etc/ceph/ceph.conf')

>>> cluster.conf_get('osd pool default pg num')

'256'

>>> cluster.connect()

>>> cluster.create_pool('PE-TEST4')

 

After the pool is created via the librados python library, I check the pg_num of the pool and it's 8; not 256.

[root@DCOS01 lib]# ceph osd pool get PE-TEST4 pg_num

pg_num: 8

 

Has anyone else run into this issue? Am I missing something? I know I could just spawn a subprocess call to the ceph command line utility, but I would like to avoid that in the name of a cleaner python integration.

 

Your assistance is greatly appreciated.

 

Thank you,

- Jason

 

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