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https://issues.apache.org/jira/browse/ZOOKEEPER-4493?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17505965#comment-17505965
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Christopher Tubbs edited comment on ZOOKEEPER-4493 at 3/14/22, 2:59 AM:
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In general, I would not expect a downgrade to work across even a single minor
version, never mind two (and especially not to a version marked as end-of-life,
like 3.4 is). 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?
was (Author: ctubbsii):
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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