[ZOOKEEPER-4493] ZK downgrade from 3.6.3 to 3.4.13 is not working

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Not A Bug
• Affects Version/s: 3.4.13
• Assignee: Unassigned
• Reporter: Prem Kumar
• Created: 14/Mar/22 02:45
• Updated: 14/Mar/22 05:02
• Resolved: 14/Mar/22 05:02

Description

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)