From: Dan van der Ster <daniel.vanderster-vJEk5272eHo@public.gmane.org>
To: Sage Weil <sage-4GqslpFJ+cxBDgjK7y7TUQ@public.gmane.org>
Cc: ceph-devel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
ceph-users-Qp0mS5GaXlQ@public.gmane.org
Subject: Re: v0.80 Firefly released
Date: Wed, 7 May 2014 17:44:06 +0200 [thread overview]
Message-ID: <536A54C6.4060202@cern.ch> (raw)
In-Reply-To: <alpine.DEB.2.00.1405061757540.28165-vIokxiIdD2AQNTJnQDzGJqxOck334EZe@public.gmane.org>
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Hi,
Sage Weil wrote:
> **Primary affinity*: Ceph now has the ability to skew selection of
> OSDs as the "primary" copy, which allows the read workload to be
> cheaply skewed away from parts of the cluster without migrating any
> data.
Can you please elaborate a bit on this one? I found the blueprint [1]
but still don't quite understand how it works. Does this only change the
crush calculation for reads? i.e writes still go to the usual primary,
but reads are distributed across the replicas? If so, does this change
the consistency model in any way.
Cheers, Dan
[1]
http://wiki.ceph.com/Planning/Blueprints/Firefly/osdmap%3A_primary_role_affinity
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next prev parent reply other threads:[~2014-05-07 15:44 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-07 1:05 v0.80 Firefly released Sage Weil
[not found] ` <alpine.DEB.2.00.1405061757540.28165-vIokxiIdD2AQNTJnQDzGJqxOck334EZe@public.gmane.org>
2014-05-07 15:44 ` Dan van der Ster [this message]
[not found] ` <536A54C6.4060202-vJEk5272eHo@public.gmane.org>
2014-05-07 15:51 ` Sage Weil
2014-05-07 15:53 ` Gregory Farnum
2014-05-07 18:18 ` [ceph-users] " Mike Dawson
2014-05-07 18:30 ` Gregory Farnum
2014-05-08 12:20 ` Andrey Korolyov
2014-05-09 21:48 ` Mike Dawson
[not found] ` <536D4D48.5040307-ffsCFlcjuZBWk0Htik3J/w@public.gmane.org>
2014-05-11 12:32 ` Sergey Malinin
[not found] ` <BLU436-SMTP195A770E0A729DF4723DD28DF310@phx.gbl>
2014-05-16 13:09 ` Radosgw - bucket index Sage Weil
2014-05-16 16:42 ` Yehuda Sadeh
2014-05-18 6:25 ` Guang
2014-05-18 23:05 ` Sage Weil
2014-05-19 6:18 ` Guang Yang
2014-05-19 6:47 ` Yehuda Sadeh
2014-05-30 0:35 ` Guang Yang
[not found] ` <0F65B78C-DF9A-40E4-BAAF-7411443DA3B6@outlook.com>
2014-06-02 13:37 ` Guang Yang
[not found] ` <959F3CD3-D69A-4B9C-818C-7C0F241E48EC@outlook.com>
2014-06-06 12:50 ` Guang Yang
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