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https://issues.apache.org/jira/browse/ZOOKEEPER-3848?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17116368#comment-17116368
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Mohammad Arshad commented on ZOOKEEPER-3848:
--------------------------------------------
zookeeper.snapshot.trust.empty is not the correct configuration if you are
adding in zoocfg.
try adding snapshot.trust.empty=true in zoo.cfg it will work.
> Zookeeper upgrade fails due to missing snapshots on branch-3.6
> --------------------------------------------------------------
>
> Key: ZOOKEEPER-3848
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3848
> Project: ZooKeeper
> Issue Type: Bug
> Components: server
> Affects Versions: 3.6.2
> Reporter: Zhuqi Jin
> Priority: Major
>
> We tested upgrading a single-node zookeeper from branch-3.4/branch-3.5 to
> branch-3.6, but the upgraded node failed to start.
> The error message is shown as following:
> {code:java}
> 2020-05-24 00:24:24,996 [myid:1] - ERROR [main:ZooKeeperServerMain@90] -
> Unexpected exception, exiting abnormally
> java.io.IOException: No snapshot found, but there are log entries. Something
> is broken!
> at
> org.apache.zookeeper.server.persistence.FileTxnSnapLog.restore(FileTxnSnapLog.java:281)
> at
> org.apache.zookeeper.server.ZKDatabase.loadDataBase(ZKDatabase.java:285)
> at
> org.apache.zookeeper.server.ZooKeeperServer.loadData(ZooKeeperServer.java:484)
> at
> org.apache.zookeeper.server.ZooKeeperServer.startdata(ZooKeeperServer.java:655)
> at
> org.apache.zookeeper.server.NIOServerCnxnFactory.startup(NIOServerCnxnFactory.java:758)
> at
> org.apache.zookeeper.server.ServerCnxnFactory.startup(ServerCnxnFactory.java:130)
> at
> org.apache.zookeeper.server.ZooKeeperServerMain.runFromConfig(ZooKeeperServerMain.java:159)
> at
> org.apache.zookeeper.server.ZooKeeperServerMain.initializeAndRun(ZooKeeperServerMain.java:112)
> at
> org.apache.zookeeper.server.ZooKeeperServerMain.main(ZooKeeperServerMain.java:67)
> at
> org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:140)
> at
> org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:90)
> 2020-05-24 00:24:24,999 [myid:1] - INFO [main:ZKAuditProvider@42] -
> ZooKeeper audit is disabled.
> 2020-05-24 00:24:25,001 [myid:1] - ERROR [main:ServiceUtils@42] - Exiting JVM
> with code 1 {code}
> The error can be reproduced through the following steps:
> # Step1: Start a single-node zookeeper (compiled from either branch-3.4 or
> branch-3.5) with the following configuration(zoo.cfg):
> {code:java}
> tickTime=2000
> initLimit=10
> syncLimit=5
> dataDir=/tmp/zookeeper
> clientPort=2181
> server.1=localhost:2888:3888{code}
> # Step2: Use a zookeeper stress testing tool - zk-smoketool
> ([https://github.com/phunt/zk-smoketest.git]) - to test this node. We invoked
> create, set, and get operations in zk-smoketool but not delete operation, so
> that generated data are left on disk.
> # Step3: Upgrade the node to branch-3.6 with the same configuration. After
> upgraded, as the log suggested, zookeeper failed to start.
> We learned about ZOOKEEPER-3056 and ZOOKEEPER-3513, and added
> {code:java}
> zookeeper.snapshot.trust.empty=true {code}
> to branch-3.6's configuration(zoo.cfg), but it ran into the same failure.
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