stray message problem when changing servers
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Key: ZOOKEEPER-417
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-417
Project: Zookeeper
Issue Type: Bug
Reporter: Benjamin Reed
Fix For: 3.2.0
There is a possibility for stray messages from a previous connection to
violate ordering and generally cause problems. Here is a scenario: we have a
client, C, two followers, F1 and F2, and a leader, L. The client is connected
to F1, which is a slow follower. C sends setData("/a", "1") to F1 and then
loses the connection, so C reconnects to F2 and sends setData("/a", "2"). it
is possible, if F1 is slow enough and the setData("/a", "1") got onto the
network before the connection break, for F1 to forward the setData("/a", "1")
to L after F2 forwards setData("/a", "2").
to fix this, the leader should keep track of which follower last registered a
session for a client and drop any requests from followers for clients for whom
they do not have a registration.
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