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From "Michael Han (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ZOOKEEPER-3056) Fails to load database with missing snapshot file but valid transaction log file
Date Tue, 05 Jun 2018 15:04:00 GMT
Michael Han created ZOOKEEPER-3056:
--------------------------------------

             Summary: 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: 3.5.4, 3.5.3
            Reporter: Michael Han


[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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