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From "Hudson (Jira)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-3056) Fails to load database with missing snapshot file but valid transaction log file
Date Thu, 05 Sep 2019 00:48:00 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-3056?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16922967#comment-16922967
] 

Hudson commented on ZOOKEEPER-3056:
-----------------------------------

ABORTED: Integrated in Jenkins build Zookeeper-trunk-single-thread #514 (See [https://builds.apache.org/job/Zookeeper-trunk-single-thread/514/])
ZOOKEEPER-3056: Fails to load database with missing snapshot file but (enrico.olivelli: rev
68c21988d55c57e483370d3ee223c22da2d1bbcf)
* (edit) zookeeper-server/src/main/java/org/apache/zookeeper/server/persistence/FileTxnSnapLog.java
* (edit) zookeeper-docs/src/main/resources/markdown/zookeeperAdmin.md
* (edit) zookeeper-server/src/test/java/org/apache/zookeeper/test/EmptiedSnapshotRecoveryTest.java


> 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
>            Assignee: Michael Han
>            Priority: Critical
>              Labels: pull-request-available
>             Fix For: 3.6.0, 3.5.6
>
>         Attachments: snapshot.0
>
>          Time Spent: 5h 10m
>  Remaining Estimate: 0h
>
> [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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