[ovs-build] Still Failing: igsilya/ovs#743 (tmp-master - 247e977)

[Travis CI]

Build Update for igsilya/ovs
-------------------------------------

Build: #743
Status: Still Failing

Duration: 54 mins and 56 secs
Commit: 247e977 (tmp-master)
Author: Ilya Maximets
Message: raft: Avoid sending equal snapshots.

Snapshots are huge.  In some cases we could receive several outdated
append replies from the remote server.  This could happen in high
scale cases if the remote server is overloaded and not able to process
all the raft requests in time.  As an action to each outdated append
reply we're sending full database snapshot.  While remote server is
already overloaded those snapshots will stuck in jsonrpc backlog for
a long time making it grow up to few GB.  Since remote server wasn't
able to timely process incoming messages it will likely not able to
process snapshots leading to the same situation with low chances to
recover.  Remote server will likely stuck in 'candidate' state, other
servers will grow their memory consumption due to growing jsonrpc
backlogs:

jsonrpc|INFO|excessive sending backlog, jsonrpc: ssl:192.16.0.3:6644,
             num of msgs: 3795, backlog: 8838994624.

This patch is trying to avoid that situation by avoiding sending of
equal snapshot install requests.

Signed-off-by: Ilya Maximets <i.maximets at ovn.org>

View the changeset: https://github.com/igsilya/ovs/compare/a4855d893f5a...247e977fe130

View the full build log and details: https://travis-ci.org/github/igsilya/ovs/builds/690208809?utm_medium=notification&utm_source=email

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