I got the same error. The problem solved by setting 
export HBASE_MANAGES_ZK=false
in hbase-env.sh in the slave machine



Jean-Daniel Cryans-2 wrote:
> 
> Mark,
> 
> Using only 1 ZK quorum member isn't a problem with fully-distributed
> mode, just put the hostname of the machine instead of "localhost".
> 
> That NodeExists sometimes happen but I don't remember why... do you
> have a bigger stack trace? Also IIRC it's harmless.
> 
> Thx,
> 
> J-D
> 
> On Fri, Oct 23, 2009 at 10:49 AM, Mark Vigeant
> <[email protected]> wrote:
>> Hey-
>>
>> I just manually configured zookeeper (I had been letting hbase do the
>> managing) on 2 nodes (I know I should use an odd number of nodes but I
>> didn't want to be in standalone mode and I only have 2 machines to play
>> with right now) and when I start up hbase I get an interesting error
>> message on one node:
>>
>> 2009-10-24 13:43:43,798 - WARN
>>  [ProcessThread:-1:preprequestproces...@402] - Got exception when
>> processing sessionid:0x124827089980006 type:create cxid:0x1d
>> zxid:0xfffffffffffffffe txntype:unknown n/a
>> org.apache.zookeeper.KeeperException$NodeExistsException: KeeperErrorCode
>> = NodeExists
>>      at
>> org.apache.zookeeper.server.PrepRequestProcessor.pRequest(PrepRequestProcessor.java:245)
>>      at
>> org.apache.zookeeper.server.PrepRequestProcessor.run(PrepRequestProcessor.java:114)
>>
>> It repeats this every now and again... is this something I should be
>> worrying about? Hbase still works fine
>>
>> Mark Vigeant
>> RiskMetrics Group, Inc.
>>
>>
> 
> 

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