Comments (3)
You can deliver whole messages in any order, yes, and this implementation will be just fine with that. However if you simply swap TCP with UDP using the default implementation of the raft_io
interface, then you might get partial messages (or any sort of byte rearrangement of the message stream), and that won't work. You'd need to implement your own version of the raft_io
interface that is able to tolerate UDP re-arrangements and still deliver whole messages to the core engine (possibly out of order). See also raft.h
for the definition of the raft_io
interface.
Hope that helps.
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I suppose my follow up would be if there's a maximum size for the datagram. I would imagine if it's below the link MTU then we wouldn't need to worry about re-arrangement. On the other hand, TCP probably works fine.
from raft.
I suppose my follow up would be if there's a maximum size for the datagram. I would imagine if it's below the link MTU then we wouldn't need to worry about re-arrangement. On the other hand, TCP probably works fine.
We wouldn't need to worry about partial messages, correct. But the raft library can't make such a guarantee because the size of (say) AppendEntries messages basically depend on the user's payload.
Note that there's been anecdotal evidence that UDP doesn't make the Raft algorithm any faster in practice. Plus you'll very likely need to re-invent some part of TCP in your UDP-based implementation (e.g. flow control).
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Related Issues (20)
- missing getrandom on centos 7 HOT 1
- [question] Usage of raft_add, raft_remove, and raft_assign HOT 2
- [question] When is the first leader elected? HOT 2
- recvAppendEntries: Assertion `r->state == RAFT_FOLLOWER || r->state == RAFT_CANDIDATE` failed HOT 9
- [question] Forwarding request to leader HOT 8
- Potential use-after-free in handling of raft_transfer HOT 5
- Fix the 32-bit CI HOT 1
- can't build on m1 mac (`<linux/xxxxx.h>` is missing) HOT 3
- v1.x RFC: pull based approach HOT 5
- raft_start(): io: closed segment xxx is past last snapshot xxx HOT 4
- [question] Understanding how to add new servers HOT 15
- ./configure fails when no external dependency is found HOT 4
- Assertion: src/uv_truncate.c:168: UvTruncate: Assertion `index < uv->append_next_index' failed. HOT 3
- src/replication.c:457: getRequest: Assertion `req->type == type' failed. HOT 3
- Segment writes blocked when taking a snapshot. HOT 3
- src/log.c:87: refsTryInsert: Assertion `next_slot->term != term' failed. HOT 9
- Jepsen: Another truncate-related assertion failure
- [suggestion] add lock/unlock function pointers to raft_io (and use them) HOT 1
- `uvOsFallocateEmulation` taking too long time HOT 1
- CI: `xfs` test failures HOT 1
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