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https://issues.apache.org/jira/browse/ZOOKEEPER-3056?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16519839#comment-16519839
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Brian Nixon commented on ZOOKEEPER-3056:
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As a work-around for anyone currently blocked on this issue, I've uploaded a
empty snapshot file here.
To perform an upgrade (3.4 -> 3.5):
* download the "snapshot.0" file attached
* copy it to the versioned directory (e.g. "version-2") within your data
directory (parameter "dataDir" in your config - this is the directory
containing the "myid" file for a peer)
* restart the peer
* upgrade the peer (this can be combined with the above step if you like)
> 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
> Priority: Critical
> Attachments: snapshot.0
>
>
> [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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