Yang, Thanks for your report
Il Mar 13 Dic 2022, 18:16 Yang Sirius <alpha.canis.majo...@outlook.com> ha scritto: > Hi everyone! > > Recently we discovered two issues in the ZooKeeper’s latest versions that > might cause data inconsistency or committed data loss. Details and analysis > of the issues are presented on JIRA: > > > - ZOOKEEPER-4643 <https://issues.apache.org/jira/browse/ZOOKEEPER-4643> : > Committed txns may be improperly truncated if follower crashes right > after updating currentEpoch but before persisting txns to disk. > - ZOOKEEPER-4646 <https://issues.apache.org/jira/browse/ZOOKEEPER-4646> > : Committed txns may still be lost if followers crash after replying > ACK-LD but before writing txns to disk. (This issue is related to the fix > of ZOOKEEPER-3911 > <https://issues.apache.org/jira/browse/ZOOKEEPER-3911>) > > > The issues seem to be critical since they lead to data loss or > inconsistency, which violate the properties that ZAB is supposed to > satisfy. I wonder whether the bugs should get a fix since data consistency > is of prime importance of ZooKeeper. If so, I will try to fix the code > together with further testing and verification techniques. > Help is always welcome! I personally don't have time to investigate and code a fix, but I will be happy to review your work Thank you very much Sharing problems and solutions is fundamental for an OSS community like Apache ZooKeeper Cheers Enrico > Thanks! > > Attached are example traces of these two issues that have been generated > in multiple versions such as 3.8.0 & 3.7.1. (The traces are also provided > on JIRA.) > Trace-ZK-4643: > Trace-ZK-4646: >
