Yongcheng Liu created ZOOKEEPER-2660:
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Summary: acceptedEpoch and currentEpoch data inconsistency, ZK
process can not start!
Key: ZOOKEEPER-2660
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2660
Project: ZooKeeper
Issue Type: Bug
Components: quorum
Affects Versions: 3.4.9, 3.4.6
Environment: ZK: 3.4.9
Reporter: Yongcheng Liu
1. currentEpoch is bigger than acceptedEpoch, ZK will throw IOException when
start loadDataBase.
2. function bug. In function setAcceptedEpoch and setCurrentEpoch, it is modify
memory variable first, then write epoch to file. If write file failed, the
memory has been modified.
solution as follow:
for example,
public void setAcceptedEpoch(long e) throws IOException {
acceptedEpoch = e;
writeLongToFile(ACCEPTED_EPOCH_FILENAME, e);
}
need to modify as follow:
public void setAcceptedEpoch(long e) throws IOException {
writeLongToFile(ACCEPTED_EPOCH_FILENAME, e);
acceptedEpoch = e;
}
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