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From "Mohammad Arshad (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-2960) The dataDir and dataLogDir are used opposingly
Date Thu, 04 Jan 2018 08:21:00 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-2960?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16310965#comment-16310965
] 

Mohammad Arshad commented on ZOOKEEPER-2960:
--------------------------------------------

Thanks [~andorm] for reporting this issue, submitting your analysis and patch.
I also will have a look on this issue very soon.

> The dataDir and dataLogDir are used opposingly
> ----------------------------------------------
>
>                 Key: ZOOKEEPER-2960
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2960
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: server
>    Affects Versions: 3.4.11
>         Environment: Not relevant.
>            Reporter: Dan Milon
>            Assignee: Andor Molnar
>            Priority: Critical
>
> After upgrading from zookeeper 3.4.5, to 3.4.11, without editing {{zoo.cfg}}, the new
version of the server tries to use the {{dataDir}} as the {{dataLogDir}}, and the {{dataLogDir}}
as the {{dataDir}}. Or at least some parts of the server.
> Configuration file has:
> {noformat}
> $ grep -i data /etc/zookeeper/zoo.cfg 
> dataLogDir=/var/lib/zookeeper/datalog
> dataDir=/var/lib/zookeeper/data
> {noformat}
> But runtime configuration has:
> {noformat}
> $ echo conf | nc localhost 2181 | grep -i data
> dataDir=/var/lib/zookeeper/datalog/version-2
> dataLogDir=/var/lib/zookeeper/data/version-2
> {noformat}
> Also, I got this in the debug logs, so clearly some parts of the server confuse things.
> {noformat}
> [PurgeTask:FileTxnSnapLog@79] - Opening datadir:/var/lib/zookeeper/datalog snapDir:/var/lib/zookeeper/data
> [main:FileTxnSnapLog@79] - Opening datadir:/var/lib/zookeeper/data snapDir:/var/lib/zookeeper/datalog
> {noformat}
> I tried to look in the code for wrong uses of the directories. I only found [ZookeeperServer.java|https://github.com/apache/zookeeper/blob/master/src/java/main/org/apache/zookeeper/server/ZooKeeperServer.java#L227]
is passing the arguments to {{FileTxnSnapLog}} in the wrong order, but the code comment says
that this is legacy only for tests, so I assume it isn't the cause for my case.



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