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on_synch_diff_cb is called every time
the level of synchronization of a replica with respect
to other replicas changes.
synced contains the names of the replicas
in the replication system with which this replica is
currently completely synchronized (including itself).
synching contains the names of the other replicas
in the replication system with which this replica is
still attempting to synchronize (synching is disjoint
from synced).
The parameter t indicates the type of synchronization
change causing this callback and the meaning of the
contents of diff. t can be one of following
| RHT_SYNCH_SUBTRACTIVE |
indicates a loss of communication
with formerly synchronized replicas |
| RHT_SYNCH_NEUTRAL |
indicates a change solely in the set of actively
synchronizing replicas (synching) |
| RHT_SYNCH_ADDITIVE |
indicates completion of synchronization with formerly
unsynchronized replicas |
RHT_SYNCH_SUBTRACTIVE indicates that diff contains
the names of the formerly synchronized replicas with
which communication was lost.
RHT_SYNCH_NEUTRAL indicates that diff is empty --
if you want to track changes in the synching set, you
will need to track them yourself.
RHT_SYNCH_ADDITIVE indicates that diff contains the
names of the newly synchronized replicas.
Note, that the synching set can change for all three
types. t and diff are really only there to distinguish
between types of changes with respect to completely
synchronized replicas.
Note that these name sets are only valid while in the
current callback and references to them must not be
kept. |
C API