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Posted to dev@zookeeper.apache.org by "Andrew Grasso (JIRA)" <ji...@apache.org> on 2015/11/18 23:22:11 UTC

[jira] [Created] (ZOOKEEPER-2325) Data inconsistency if all snapshots empty or missing

Andrew Grasso created ZOOKEEPER-2325:
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             Summary: 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


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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