- **Milestone**: 5.19.07 --> 5.19.10
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** [tickets:#2908] dtm: Add support for connection-oriented TIPC**
**Status:** assigned
**Milestone:** 5.19.10
**Created:** Wed Aug 01, 2018 01:20 PM UTC by Anders Widell
**Last Updated:** Wed Jul 03, 2019 06:28 AM UTC
**Owner:** Minh Hon Chau
DTM currently uses TCP connections for communication between nodes. This ticket
proposes that support shall be added for using connection-oriented TIPC instead
of, or possibly also at the same time as TCP. The reason for using both TCP and
TIPC at the same time would be that DTM can monitor the connectivity between
nodes using both TIPC and TCP. The connectivity should then only be considered
to be up if both TCP and TIPC are connected. CLM could use this information to
disallow cluster membership of nodes that are not connected using both TCP and
TIPC. However, it could still be possible to send messages between the nodes
using just one of the two connection types - this could be useful to avoid
split-brain problems.
Another reason for adding support for TIPC in DTM is that we can avoid the
problem that our current TIPC implementation can lose messages, and we would no
longer require real-time priority for the MDS thread. In fact, the MDS thread
could be completely removed and we could remove the MDS code for handling TIPC
(only DTM would need to support TIPC).
This is a rather large enhancement if all features mentioned above are
implemented. However, as a first step a very small implementation could simply
add support in DTM for using TIPC instead of TCP. This ought to be easy to
implement. We would then have three possible configurations:
* TCP using DTM
* TIPC using DTM (new)
* TIPC without DTM
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