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https://issues.apache.org/jira/browse/ZOOKEEPER-3056?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16974835#comment-16974835
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Anton commented on ZOOKEEPER-3056:
----------------------------------
Faced the same issue when upgrade from 3.4.9 to 3.5.6
{noformat}
2019-11-15 06:04:18,455 [main] ERROR QuorumPeer.java (line 955) 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:222)
at org.apache.zookeeper.server.ZKDatabase.loadDataBase(ZKDatabase.java:240)
at
org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:919)
at org.apache.zookeeper.server.quorum.QuorumPeer.start(QuorumPeer.java:905)
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)
2019-11-15 06:04:18,462 [main] ERROR QuorumPeerMain.java (line 101) Unexpected
exception, exiting abnormally
{noformat}
> Fails to load database with missing snapshot file but valid transaction log
> file
> --------------------------------------------------------------------------------
>
> Key: ZOOKEEPER-3056
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3056
> Project: ZooKeeper
> Issue Type: Bug
> Components: server
> Affects Versions: 3.5.3, 3.5.4
> Reporter: Michael Han
> Assignee: Michael Han
> Priority: Critical
> Labels: pull-request-available
> Fix For: 3.6.0, 3.5.6
>
> Attachments: snapshot.0
>
> Time Spent: 5h 10m
> Remaining Estimate: 0h
>
> [An
> issue|https://lists.apache.org/thread.html/cc17af6ef05d42318f74148f1a704f16934d1253f1472cccc1a93b4b@%3Cdev.zookeeper.apache.org%3E]
> was reported when a user failed to upgrade from 3.4.10 to 3.5.4 with missing
> snapshot file.
> The code complains about missing snapshot file is
> [here|https://github.com/apache/zookeeper/blob/release-3.5.4/src/java/main/org/apache/zookeeper/server/persistence/FileTxnSnapLog.java#L206]
> which is introduced as part of ZOOKEEPER-2325.
> With this check, ZK will not load the db without a snapshot file, even the
> transaction log files are present and valid. This could be a problem for
> restoring a ZK instance which does not have a snapshot file but have a sound
> state (e.g. it crashes before being able to take the first snap shot with a
> large snapCount parameter configured).
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