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From Patrick Hunt <ph...@apache.org>
Subject Re: ZK recovery questions
Date Wed, 21 Jul 2010 06:14:36 GMT
Not having a datadir is currently not possible - the servers expect to 
read/write snapshot and log files. In particular the leader needs to be 
able to stream updates, and in some cases the entire latest snapshot, to 
a follower. It does this by streaming data directly from the filesystem.

Patrick

On 07/20/2010 11:01 PM, Ashwin Jayaprakash wrote:
>
> I did try a quick test on Windows (yes, some of us use Windows :)
>
> I thought simply changing the "dataDir" to the "/dev/null" equivalent on
> Windows would do the trick. It didn't work. It looks like a Java issue
> because I noticed inconsistencies in the File API regarding this. I wrote
> about it here -
> http://javaforu.blogspot.com/2010/07/devnull-on-windows.html
> devnull-on-windows .
>
> BTW the Windows equivalent is "nul".
>
> This is the error I got on Windows (below). The mkdirs() returns false. As
> noted on my blog, it returns true for some cases.
>
> 2010-07-20 22:25:47,851 - FATAL [main:ZooKeeperServerMain@62] - Unexpected
> exception, exiting abnormally
> java.io.IOException: Unable to create data directory nul:\version-2
>          at
> org.apache.zookeeper.server.persistence.FileTxnSnapLog.<init>(FileTxnSnapLog.java:79)
>          at
> org.apache.zookeeper.server.ZooKeeperServerMain.runFromConfig(ZooKeeperServerMain.java:102)
>          at
> org.apache.zookeeper.server.ZooKeeperServerMain.initializeAndRun(ZooKeeperServerMain.java:85)
>          at
> org.apache.zookeeper.server.ZooKeeperServerMain.main(ZooKeeperServerMain.java:51)
>          at
> org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:108)
>          at
> org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:76)
>
>
> Ashwin.

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