Jiafu Jiang created ZOOKEEPER-3393:
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Summary: Read-only file system may make the whole ZooKeeper
cluster to be unavailable.
Key: ZOOKEEPER-3393
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3393
Project: ZooKeeper
Issue Type: Bug
Components: leaderElection, server
Affects Versions: 3.4.14, 3.4.12
Reporter: Jiafu Jiang
Say we have 3 nodes: zk1, zk2, and zk3, zk3 is the leader.
If the file system of the ZooKeeper data directory of the leader is read-only
due to some hardware error, the leader will exit and begin a new election.
But the election will keep looping because the new leader may be zk3 again, but
zk3 will fail to write epoch to disk due to read-only file system.
Since we have 3 nodes, if only one of them is in problem, should the ZooKeeper
cluster be available? If the answer is yes, then we ought to fix this problem.
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