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libceph: add support for HASHPSPOOL pool flag

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The legacy behavior adds the pgid seed and pool together as the input for
CRUSH.  That is problematic because each pool's PGs end up mapping to the
same OSDs: 1.5 == 2.4 == 3.3 == ...

Instead, if the HASHPSPOOL flag is set, we has the ps and pool together and
feed that into CRUSH.  This ensures that two adjacent pools will map to
an independent pseudorandom set of OSDs.

Advertise our support for this via a protocol feature flag.

Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Alex Elder <elder@inktank.com>
This commit is contained in:
Sage Weil 2013-02-26 10:39:09 -08:00
parent 1b83bef24c
commit 83ca14fdd3
3 changed files with 31 additions and 14 deletions
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4
include/linux/ceph/ceph_features.h
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@ -34,6 +34,7 @@
#define CEPH_FEATURE_REPLY_CREATE_INODE (1<<27)
#define CEPH_FEATURE_OSD_HBMSGS (1<<28)
#define CEPH_FEATURE_MDSENC (1<<29)
#define CEPH_FEATURE_OSDHASHPSPOOL (1<<30)
/*
* Features supported.
@ -45,7 +46,8 @@
CEPH_FEATURE_OSDENC | \
CEPH_FEATURE_CRUSH_TUNABLES | \
CEPH_FEATURE_CRUSH_TUNABLES2 | \
CEPH_FEATURE_REPLY_CREATE_INODE)
CEPH_FEATURE_REPLY_CREATE_INODE | \
CEPH_FEATURE_OSDHASHPSPOOL)
#define CEPH_FEATURES_REQUIRED_DEFAULT \
(CEPH_FEATURE_NOSRCADDR | \