Zach Brown c061ada671 scoutfs: mounts connect once server is listening ...

An elected leader writes a quorum block showing that it's elected before
it assumes exclusive access to the device and starts bringing up the
server.  This lets another later elected leader find and fence it if
something happens.

Other mounts were trying to connect to the server once this elected
quorum block was written and before the server was listening.  They'd
get conection refused, decide to elect a new leader, and try to fence
the server that's still running.

Now, they should have tried much harder to connect to the elected leader
instead of taking a single failed attempt as fatal.  But that's a
problem for another day that involves more work in balancing timeouts
and retries.

But mounts should not have tried try to connect to the server until its
listening.  That's easy to signal by adding a simple listening flag to
the quorum block.  Now mounts will only try to connect once they see the
listening flag and don't see these racey refused connections.

Signed-off-by: Zach Brown <zab@versity.com>

2019-05-30 15:01:00 -07:00

kmod

scoutfs: mounts connect once server is listening

2019-05-30 15:01:00 -07:00

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