[jira] [Commented] (ZOOKEEPER-4493) ZK downgrade from 3.6.3 to 3.4.13 is not working

["Christopher Tubbs (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-4493?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17505965#comment-17505965 ] 

Christopher Tubbs commented on ZOOKEEPER-4493:
----------------------------------------------

In general, I would not expect a downgrade to work across even a single minor version, never mind two. The whole point of a minor version bump is that it implies newer features could be added that did not previously exist in, and therefore cannot be expected to be supported by, earlier versions. As a ticket, I think this might be an unreasonable change request. But, perhaps somebody might be able to help on the mailing list?

> ZK downgrade from 3.6.3 to 3.4.13 is not working
> ------------------------------------------------
>
>                 Key: ZOOKEEPER-4493
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-4493
>             Project: ZooKeeper
>          Issue Type: Bug
>    Affects Versions: 3.4.13
>            Reporter: Prem Kumar
>            Priority: Major
>
> Hi Team,
> I have upgraded my zk cluster from 3.4.13 to 3.6.3 and it was successful. when i am trying to rollback from 3.6.3 to 3.4.13, i am facing some issues and it was not successful.
> Can someone help me on this issue?
>  
> *Logs:*
> 2022-02-10 12:50:37,532 [myid:3] - INFO [main:QuorumPeer@1178] - minSessionTimeout set to 4000
> 2022-02-10 12:50:37,533 [myid:3] - INFO [main:QuorumPeer@1189] - maxSessionTimeout set to 40000
> 2022-02-10 12:50:37,540 [myid:3] - INFO [main:QuorumPeer@1467] - QuorumPeer communication is not secured!
> 2022-02-10 12:50:37,541 [myid:3] - INFO [main:QuorumPeer@1496] - quorum.cnxn.threads.size set to 20
> 2022-02-10 12:50:37,551 [myid:3] - INFO [main:FileSnap@86] - Reading snapshot /zk/version-2/snapshot.18000000bd
> 2022-02-10 12:50:37,641 [myid:3] - ERROR [main:QuorumPeer@692] - Unable to load database on disk
> *java.io.IOException: Unsupported Txn with type=%d15*
> at org.apache.zookeeper.server.util.SerializeUtils.deserializeTxn(SerializeUtils.java:89)
> at org.apache.zookeeper.server.persistence.FileTxnLog$FileTxnIterator.next(FileTxnLog.java:641)
> at org.apache.zookeeper.server.persistence.FileTxnLog$FileTxnIterator.init(FileTxnLog.java:556)
> at org.apache.zookeeper.server.persistence.FileTxnLog$FileTxnIterator.<init>(FileTxnLog.java:531)
> at org.apache.zookeeper.server.persistence.FileTxnLog.read(FileTxnLog.java:358)
> at org.apache.zookeeper.server.persistence.FileTxnSnapLog.fastForwardFromEdits(FileTxnSnapLog.java:193)
> at org.apache.zookeeper.server.persistence.FileTxnSnapLog.restore(FileTxnSnapLog.java:176)
> at org.apache.zookeeper.server.ZKDatabase.loadDataBase(ZKDatabase.java:217)
> at org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:645)
> at org.apache.zookeeper.server.quorum.QuorumPeer.start(QuorumPeer.java:635)
> at org.apache.zookeeper.server.quorum.QuorumPeerMain.runFromConfig(QuorumPeerMain.java:170)
> at org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:114)
> at org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:81)
> 2022-02-10 12:50:37,643 [myid:3] - ERROR [main:QuorumPeerMain@92] - Unexpected exception, exiting abnormally
> java.lang.RuntimeException: Unable to run quorum server
> at org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:693)
> at org.apache.zookeeper.server.quorum.QuorumPeer.start(QuorumPeer.java:635)
> at org.apache.zookeeper.server.quorum.QuorumPeerMain.runFromConfig(QuorumPeerMain.java:170)
> at org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:114)
> at org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:81)
> *Caused by: java.io.IOException: Unsupported Txn with type=%d15*
> at org.apache.zookeeper.server.util.SerializeUtils.deserializeTxn(SerializeUtils.java:89)
> at org.apache.zookeeper.server.persistence.FileTxnLog$FileTxnIterator.next(FileTxnLog.java:641)
> at org.apache.zookeeper.server.persistence.FileTxnLog$FileTxnIterator.init(FileTxnLog.java:556)
> at org.apache.zookeeper.server.persistence.FileTxnLog$FileTxnIterator.<init>(FileTxnLog.java:531)
> at org.apache.zookeeper.server.persistence.FileTxnLog.read(FileTxnLog.java:358)
> at org.apache.zookeeper.server.persistence.FileTxnSnapLog.fastForwardFromEdits(FileTxnSnapLog.java:193)
> at org.apache.zookeeper.server.persistence.FileTxnSnapLog.restore(FileTxnSnapLog.java:176)
> at org.apache.zookeeper.server.ZKDatabase.loadDataBase(ZKDatabase.java:217)
> at org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:645)



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