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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-2960) The dataDir and dataLogDir are used opposingly
Date Fri, 02 Mar 2018 00:37:00 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-2960?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16382933#comment-16382933
] 

ASF GitHub Bot commented on ZOOKEEPER-2960:
-------------------------------------------

Github user anmolnar commented on the issue:

    https://github.com/apache/zookeeper/pull/475
  
    I know what the problem is. 3.4.11 has a bug that swaps dataDir and dataLogDir from config
file.
    Sorry, it's only mentioned briefly on the release page:
    http://zookeeper.apache.org/releases.html
    > WARNING: ZOOKEEPER-2960 was recently identified as a regression in 3.4.11 ...
    
    Please wait for 3.4.12 for the fix and in the meantime you can probably workaround it
with your fix, but it should not be merged in the codebase.


> 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
>             Fix For: 3.4.12
>
>
> _emphasized text_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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