Problem with successive leader failures when no client is connected
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Key: ZOOKEEPER-313
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-313
Project: Zookeeper
Issue Type: Bug
Components: server
Affects Versions: 3.0.1, 3.0.0
Environment: all
Reporter: Sunanda Bera
Steps to reproduce:
Create a 3 node cluster . Run some transactions and then stop all clients. Make
sure no other clients connect for the duration of the test.
Let L1 be the current leader. Bring down L1. Let L2 be the leader chosen. Let
the third node be N3. Note that this will increase the txn id for N3's snapshot
without any transaction being logged. Now bring up L1 -- same will happen for
L1. Now bring down L2.
Both N3 and L1 now have snapshots with a transaction id greater than the last
logged transaction. Whoever is elected leader will try to restore its state
from the filesystem and fail.
One easy workaround is obviously to change the FileTxnSnapLog not to save a
snapshot if zxid > last logged zxid. The correct solution is possibly to log a
transaction for leader election as well.
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