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https://issues.apache.org/jira/browse/ZOOKEEPER-2325?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15706823#comment-15706823
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Andrew Grasso commented on ZOOKEEPER-2325:
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This looks good to me. Thanks for putting the pull request together.
> Data inconsistency if all snapshots empty or missing
> ----------------------------------------------------
>
> Key: ZOOKEEPER-2325
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2325
> Project: ZooKeeper
> Issue Type: Bug
> Components: server
> Affects Versions: 3.4.6
> Reporter: Andrew Grasso
> Assignee: Andrew Grasso
> Priority: Critical
> Attachments: ZOOKEEPER-2325-test.patch, ZOOKEEPER-2325.001.patch,
> zk.patch
>
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> When loading state from snapshots on startup, FileTxnSnapLog.java ignores the
> result of FileSnap.deserialize, which is -1L if no valid snapshots are found.
> Recovery proceeds with dt.lastProcessed == 0, its initial value.
> The result is that Zookeeper will process the transaction logs and then begin
> serving requests with a different state than the rest of the ensemble.
> To reproduce:
> In a healthy zookeeper cluster of size >= 3, shut down one node.
> Either delete all snapshots for this node or change all to be empty files.
> Restart the node.
> We believe this can happen organically if a node runs out of disk space.
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