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From "Brian Nixon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-3056) Fails to load database with missing snapshot file but valid transaction log file
Date Thu, 21 Jun 2018 23:23:00 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-3056?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16519839#comment-16519839
] 

Brian Nixon commented on ZOOKEEPER-3056:
----------------------------------------

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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