i did a benchmark a while back to see the effect of turning off the disk. (it wasn't as big as you would think.) i had to modify the code. there is an option to turn off the sync in the config that will get you most of the performance you would get by turning off the disk entirely.

ben

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:zookeeperserverm...@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.

Reply via email to