Aldan Brito created ZOOKEEPER-3826:
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             Summary: upgrade from 3.4.x to 3.5.x
                 Key: ZOOKEEPER-3826
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3826
             Project: ZooKeeper
          Issue Type: Bug
          Components: server
    Affects Versions: 3.5.7
         Environment: Kuberenetes 
            Reporter: Aldan Brito


upgrade of zookeeper from 3.4.14 to 3.5.7 

We faced the snapshot issue which is described in 
https://issues.apache.org/jira/browse/ZOOKEEPER-3056

After setting the property "snapshot.trust.empty=true" the upgrade was 
successful.

while reverting the "snapshot.trust.empty=false" flag one of the zookeeper 
server is failing with the similar stack trace no snapshot  found.
{code:java}
{"type":"log", "host":"zk-testzk-0", "level":"ERROR", 
"neid":"zookeeper-4636c00bfc3849e0be179bc71cef17f8", "system":"zookeeper", 
"time":"2020-05-12T08:32:17.685Z", "timezone":"UTC", "log":{"message":"main - 
org.apache.zookeeper.server.quorum.QuorumPeer - Unable to load database on 
disk"}}
java.io.IOException: No snapshot found, but there are log entries. Something is 
broken!
        at 
org.apache.zookeeper.server.persistence.FileTxnSnapLog.restore(FileTxnSnapLog.java:240)
        at 
org.apache.zookeeper.server.ZKDatabase.loadDataBase(ZKDatabase.java:240)
        at 
org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:901)
        at 
org.apache.zookeeper.server.quorum.QuorumPeer.start(QuorumPeer.java:887)
        at 
org.apache.zookeeper.server.quorum.QuorumPeerMain.runFromConfig(QuorumPeerMain.java:205)
        at 
org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:123)
        at 
org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:82)
{"type":"log", "host":"zk-testzk-0", "level":"ERROR", 
"neid":"zookeeper-4636c00bfc3849e0be179bc71cef17f8", "system":"zookeeper", 
"time":"2020-05-12T08:32:17.764Z", "timezone":"UTC", "log":{"message":"main - 
org.apache.zookeeper.server.quorum.QuorumPeerMain - Unexpected exception, 
exiting abnormally"}}
java.lang.RuntimeException: Unable to run quorum server
        at 
org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:938)
        at 
org.apache.zookeeper.server.quorum.QuorumPeer.start(QuorumPeer.java:887)
        at 
org.apache.zookeeper.server.quorum.QuorumPeerMain.runFromConfig(QuorumPeerMain.java:205)
        at 
org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:123)
        at 
org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:82)
Caused by: java.io.IOException: No snapshot found, but there are log entries. 
Something is broken!
        at 
org.apache.zookeeper.server.persistence.FileTxnSnapLog.restore(FileTxnSnapLog.java:240)
        at 
org.apache.zookeeper.server.ZKDatabase.loadDataBase(ZKDatabase.java:240)
        at 
org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:901)
{code}



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