Issues with FLENewEpochTest
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Key: ZOOKEEPER-362
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-362
Project: Zookeeper
Issue Type: Bug
Affects Versions: 3.1.1
Reporter: Flavio Paiva Junqueira
Fix For: 3.2.0
I have been able to identify two reasons that cause FLENewEpochTest to fail:
1- There is a race condition that is triggered when two peers try to establish
a connection to each other for leader election. Basically, if they start
roughly at the same time, the server with highest id will try to open two
connections. The two competing connections will lead to one notification
message to be lost. This message happens to be critical for this two process
scenario;
2- The code to shut down a peer is not working well with the unit tests. For
this particular unit test, we need to be able to shut down a peer completely to
check the situation the test tries to reproduce. However, it seems that in some
runs timing causes the other peers to believe it is still alive, and end up
electing it. This peer, however, eventually shuts down and leader election
fails.
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