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Posted to user@hbase.apache.org by Antonio D'Ettole <co...@gmail.com> on 2009/11/26 14:46:49 UTC

Zookeper not found in the classpath?

Hi folks,
I was trying to run the RowCounter example on my hadoop cluster. I followed
the instructions at
http://hadoop.apache.org/hbase/docs/current/api/org/apache/hadoop/hbase/mapreduce/package-summary.htmland
modified my HADOOP_CLASSPATH . I can tell this works because by
invoking


./bin/hadoop org.apache.hadoop.hbase.mapreduce.RowCounter mytable

the rowcounter example starts and the job is submitted to the jobtracker.
Alas, all task attempts exit with this exception:

Error: java.lang.ClassNotFoundException: org.apache.zookeeper.Watcher
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
at java.security.AccessController.doPrivileged(Native Method)
        [............]

I'm _sure_ I added the right zookeper library to the path because when I
remove it the process exits immediately with the exception

Exception in thread "main" java.lang.NoClassDefFoundError:
org/apache/zookeeper/Watcher

and the process isn't even launched. By putting the jar file back into the
classpath, the job is submitted and started but i'm back to the first
exception. Does anyone have an idea what I could be doing wrong?

Thanks

Antonio

Re: Zookeper not found in the classpath?

Posted by Antonio D'Ettole <co...@gmail.com>.

Lars,
you are absolutely right. I forgot to restart MapReduce.
Thanks.
Antonio

On Thu, Nov 26, 2009 at 3:09 PM, Lars George <la...@worldlingo.com> wrote:

> Hi Antonio,
>
> Are you sure you copied the right hadoop-env.sh to all cluster nodes and
> restarted the MapReduce framework (with stop-mapred.sh and start-mapred.sh)?
>
> Also you should try first running the row counter as a Driver like so:
>
> ./bin/hadoop <path-to-hbase>/hbase-0.20.2jar rowcounter mytable colfam1
> colfam2 ...
>
> It needs to have some columns to scan or else it will report a NPE later in
> the TableInputFormat.
>
> Lars
>
>
> Antonio D'Ettole schrieb:
>
>  Hi folks,
>> I was trying to run the RowCounter example on my hadoop cluster. I
>> followed
>> the instructions at
>>
>> http://hadoop.apache.org/hbase/docs/current/api/org/apache/hadoop/hbase/mapreduce/package-summary.htmland
>> modified my HADOOP_CLASSPATH . I can tell this works because by
>> invoking
>>
>>
>> ./bin/hadoop org.apache.hadoop.hbase.mapreduce.RowCounter mytable
>>
>> the rowcounter example starts and the job is submitted to the jobtracker.
>> Alas, all task attempts exit with this exception:
>>
>> Error: java.lang.ClassNotFoundException: org.apache.zookeeper.Watcher
>> at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
>> at java.security.AccessController.doPrivileged(Native Method)
>>        [............]
>>
>> I'm _sure_ I added the right zookeper library to the path because when I
>> remove it the process exits immediately with the exception
>>
>> Exception in thread "main" java.lang.NoClassDefFoundError:
>> org/apache/zookeeper/Watcher
>>
>> and the process isn't even launched. By putting the jar file back into the
>> classpath, the job is submitted and started but i'm back to the first
>> exception. Does anyone have an idea what I could be doing wrong?
>>
>> Thanks
>>
>> Antonio
>>
>>
>>
>

Re: Zookeper not found in the classpath?

Posted by Lars George <la...@worldlingo.com>.

Hi Antonio,

Are you sure you copied the right hadoop-env.sh to all cluster nodes and 
restarted the MapReduce framework (with stop-mapred.sh and start-mapred.sh)?

Also you should try first running the row counter as a Driver like so:

./bin/hadoop <path-to-hbase>/hbase-0.20.2jar rowcounter mytable colfam1 
colfam2 ...

It needs to have some columns to scan or else it will report a NPE later 
in the TableInputFormat.

Lars


Antonio D'Ettole schrieb:
> Hi folks,
> I was trying to run the RowCounter example on my hadoop cluster. I followed
> the instructions at
> http://hadoop.apache.org/hbase/docs/current/api/org/apache/hadoop/hbase/mapreduce/package-summary.htmland
> modified my HADOOP_CLASSPATH . I can tell this works because by
> invoking
>
>
> ./bin/hadoop org.apache.hadoop.hbase.mapreduce.RowCounter mytable
>
> the rowcounter example starts and the job is submitted to the jobtracker.
> Alas, all task attempts exit with this exception:
>
> Error: java.lang.ClassNotFoundException: org.apache.zookeeper.Watcher
> at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
> at java.security.AccessController.doPrivileged(Native Method)
>         [............]
>
> I'm _sure_ I added the right zookeper library to the path because when I
> remove it the process exits immediately with the exception
>
> Exception in thread "main" java.lang.NoClassDefFoundError:
> org/apache/zookeeper/Watcher
>
> and the process isn't even launched. By putting the jar file back into the
> classpath, the job is submitted and started but i'm back to the first
> exception. Does anyone have an idea what I could be doing wrong?
>
> Thanks
>
> Antonio
>
>