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MapReduce >> mail # user >> Map task failed: No protocol specified


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Map task failed: No protocol specified
I am using CDH4 and I am trying to access GPU from cleanup() method of
mapper class using JOCL.
(Note: My normal code(without map reduce) works fine on GPU).

When I execute my map-reduce code, It throws an error (specified below).

******************************Error********************************************
attempt_201309171647_0021_m_000000_1: No protocol specified
attempt_201309171647_0021_m_000000_1:* No protocol specified*
13/09/20 18:03:01 INFO mapred.JobClient: Task Id :
attempt_201309171647_0021_m_000000_2, Status : FAILED
org.jocl.CLException:* CL_DEVICE_NOT_FOUND*
    at org.jocl.CL.checkResult(CL.java:569)
    at org.jocl.CL.clGetDeviceIDs(CL.java:2239)
    at com.testMR.jocl.WordCountMapper.cleanup(WordCountMapper.java:106)
    at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:142)
    at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:672)
    at org.apache.hadoop.mapred.MapTask.run(MapTask.java:330)
    at org.apache.hadoop.mapred.Child$4.run(Child.java:268)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.security.auth.Subject.doAs(Subject.java:396)
    at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1408)
    at org.apache.hadoop.mapred.Child.main(Child.java:262)
******************************************************************************

*Each map task throws an error  "No protocol specified". what does this
mean ?*
What are the protocols used in mapper class ?

Regards
Rohit Sarewar
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB