Michael Han created ZOOKEEPER-3056:
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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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