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https://issues.apache.org/jira/browse/ZOOKEEPER-2960?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16382933#comment-16382933
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ASF GitHub Bot commented on ZOOKEEPER-2960:
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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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