def __init__(self, conf, greedy=True):
super(CephStorage, self).__init__(conf)
self.rados, self.ioctx = ceph.create_rados_connection(conf)
# NOTE(sileht): constants can't be class attributes because
# they rely on presence of rados module
# NOTE(sileht): We allow to read the measure object on
# outdated replicats, that safe for us, we will
# get the new stuffs on next metricd pass.
self.OMAP_READ_FLAGS = (rados.LIBRADOS_OPERATION_BALANCE_READS
| rados.LIBRADOS_OPERATION_SKIPRWLOCKS)
# NOTE(sileht): That should be safe to manipulate the omap keys
# with any OSDs at the same times, each osd should replicate the
# new key to others and same thing for deletion.
# I wonder how ceph handle rm_omap and set_omap run at same time
# on the same key. I assume the operation are timestamped so that will
# be same. If not, they are still one acceptable race here, a rm_omap
# can finish before all replicats of set_omap are done, but we don't
# care, if that occurs next metricd run, will just remove it again, no
# object with the measure have already been delected by previous, so
# we are safe and good.
self.OMAP_WRITE_FLAGS = rados.LIBRADOS_OPERATION_SKIPRWLOCKS
def __init__(self, conf, greedy=True):
super(CephStorage, self).__init__(conf)
self.rados, self.ioctx = ceph.create_rados_connection(conf)
# NOTE(sileht): constants can't be class attributes because
# they rely on presence of rados module
# NOTE(sileht): We allow to read the measure object on
# outdated replicats, that safe for us, we will
# get the new stuffs on next metricd pass.
self.OMAP_READ_FLAGS = (rados.LIBRADOS_OPERATION_BALANCE_READS |
rados.LIBRADOS_OPERATION_SKIPRWLOCKS)
# NOTE(sileht): That should be safe to manipulate the omap keys
# with any OSDs at the same times, each osd should replicate the
# new key to others and same thing for deletion.
# I wonder how ceph handle rm_omap and set_omap run at same time
# on the same key. I assume the operation are timestamped so that will
# be same. If not, they are still one acceptable race here, a rm_omap
# can finish before all replicats of set_omap are done, but we don't
# care, if that occurs next metricd run, will just remove it again, no
# object with the measure have already been delected by previous, so
# we are safe and good.
self.OMAP_WRITE_FLAGS = rados.LIBRADOS_OPERATION_SKIPRWLOCKS
def __init__(self, conf):
super(CephStorage, self).__init__(conf)
self.rados, self.ioctx = ceph.create_rados_connection(conf)
def __init__(self, conf):
super(CephStorage, self).__init__(conf)
self.rados, self.ioctx = ceph.create_rados_connection(conf)
