PIG setup throwing error - hadoop

Question

I was trying to install PIG v0.13.0 in my Fedora 20 system. After extracting the tar.gz contents, I did the PATH setup for JAVA_HOME and PIG/bin. Then I type the command pig in the console and this is what I got: Unable to understand what went wrong:
[root#localhost /]# pig
14/12/21 00:05:15 INFO pig.ExecTypeProvider: Trying ExecType : LOCAL
14/12/21 00:05:15 INFO pig.ExecTypeProvider: Trying ExecType : MAPREDUCE
14/12/21 00:05:15 INFO pig.ExecTypeProvider: Picked MAPREDUCE as the ExecType
2014-12-21 00:05:16,082 [main] INFO org.apache.pig.Main - Apache Pig version 0.13.0 (r1606446) compiled Jun 29 2014, 02:27:58
2014-12-21 00:05:16,083 [main] INFO org.apache.pig.Main - Logging error messages to: //pig_1419100516081.log
2014-12-21 00:05:16,130 [main] INFO org.apache.pig.impl.util.Utils - Default bootup file /root/.pigbootup not found
2014-12-21 00:05:16,765 [main] INFO org.apache.hadoop.conf.Configuration.deprecation - mapred.job.tracker is deprecated. Instead, use mapreduce.jobtracker.address
2014-12-21 00:05:16,771 [main] INFO org.apache.hadoop.conf.Configuration.deprecation - fs.default.name is deprecated. Instead, use fs.defaultFS
2014-12-21 00:05:16,771 [main] INFO org.apache.pig.backend.hadoop.executionengine.HExecutionEngine - Connecting to hadoop file system at: hdfs://localhost:8020
2014-12-21 00:05:16,780 [main] INFO org.apache.hadoop.conf.Configuration.deprecation - mapred.used.genericoptionsparser is deprecated. Instead, use mapreduce.client.genericoptionsparser.used
2014-12-21 00:05:19,130 [main] INFO org.apache.hadoop.conf.Configuration.deprecation - mapred.job.tracker is deprecated. Instead, use mapreduce.jobtracker.address
2014-12-21 00:05:19,130 [main] INFO org.apache.pig.backend.hadoop.executionengine.HExecutionEngine - Connecting to map-reduce job tracker at: localhost:8021
2014-12-21 00:05:19,136 [main] INFO org.apache.hadoop.conf.Configuration.deprecation - fs.default.name is deprecated. Instead, use fs.defaultFS
grunt> ls
2014-12-21 00:05:33,697 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR 2997: Encountered IOException. Call From localhost.localdomain/127.0.0.1 to localhost:8020 failed on connection exception: java.net.ConnectException: Connection refused; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused
Details at logfile: //pig_1419100516081.log
Please let me know why did the ls command in grunt shell throw the error?
Please guide.

Answer 1

When you type pig in console, by default it will go to MAPREDUCE mode, for that you need access to a Hadoop cluster and HDFS installation. Mapreduce mode is the default mode in pig.
It looks like your hadoop cluster is not configured properly that is the reason you are getting the connection refunded error. Please follow up this link to solve this connect-refused problem.http://wiki.apache.org/hadoop/ConnectionRefused.
As a workaround use LOCAL mode, this doesn't need hadoop installation.
In the console type pig -x local this will bring the grunt shell and type ls command.
Local mode
$ pig -x local
Mapreduce mode
$ pig
(or) //try to connect HDFS
$ pig -x mapreduce

Answer 2

Ok I got this one working. if I connect to the pig mapreduce mode the the ls command will change to ls hdfs:/. Hence changing the above command from ls to ls hdfs:/ resolves my problem. But again, if I am connecting to the local mode then the ls command works fine.