Sage Weil
83ca14fdd3
libceph: add support for HASHPSPOOL pool flag
...
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 >
2013-02-26 15:03:06 -08:00
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