- **Milestone**: future --> never
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** [tickets:#634] MDS: TIPC DROPPABLE usage**
**Status:** wontfix
**Milestone:** never
**Created:** Thu Nov 21, 2013 12:26 PM UTC by Hans Feldt
**Last Updated:** Fri Aug 07, 2015 04:00 AM UTC
**Owner:** nobody
MDS uses RDM (Reliable DatagraM) type of TIPC sockets.
The default setting of DEST_DROPPABLE for RDM sockets is True. This means that
TIPC is allowed to SILENTLY discard messages at congestion at the receiving
node. We can see this happen with a collocated application using TIPC at the
same IMPORTANCE. The consequence seen is often that IMM sync fails and immnd on
many nodes exit. Or amfnd gets out of sync with messages and exits.
The difference of RDM and DGRAM sockets is basically the default value of
SRC_DROPPABLE which is False for RDM. This means that on the sending node a
send can fail due to link congestion. For RDM socket this will be returned to
the client whereas for DGRAM it will not. Today I guess MDS just logs that this
happened and return and error to the client.
Please comment/discuss!
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