Pig Hcatalog failed to read data from hive table - hive

Question

grunt> table_load = load ‘test_table_one’ USING org.apache.hive.hcatalog.pig.HCatLoader();
grunt> dump table_load;
2016-10-05 17:25:43,798 [main] INFO
org.apache.hadoop.conf.Configuration.deprecation – fs.default.name is
deprecated. Instead, use fs.defaultFS 2016-10-05 17:25:43,930 [main]
INFO hive.metastore – Trying to connect to metastore with URI
thrift://localhost:9084 2016-10-05 17:25:43,931 [main] INFO
hive.metastore – Opened a connection to metastore, current
connections: 1 2016-10-05 17:25:43,934 [main] INFO hive.metastore –
Connected to metastore. … 2016-10-05 17:25:58,707 [main] INFO
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher
– HadoopJobId: job_1475669003352_0017 2016-10-05 17:25:58,707 [main]
INFO
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher
– Processing aliases table_load 2016-10-05 17:25:58,707 [main] INFO
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher
– detailed locations: M: table_load[7,13] C: R: 2016-10-05
17:25:58,716 [main] INFO
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher
– 0% complete 2016-10-05 17:25:58,716 [main] INFO
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher
– Running jobs are [job_1475669003352_0017] 2016-10-05 17:26:13,753
[main] WARN
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher
– Ooops! Some job has failed! Specify -stop_on_failure if you want Pig
to stop immediately on failure. 2016-10-05 17:26:13,753 [main] INFO
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher
– job job_1475669003352_0017 has failed! Stop running all dependent
jobs 2016-10-05 17:26:13,753 [main] INFO
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher
– 100% complete 2016-10-05 17:26:13,882 [main] ERROR
org.apache.pig.tools.pigstats.mapreduce.MRPigStatsUtil – 1 map reduce
job(s) failed! 2016-10-05 17:26:13,883 [main] INFO
org.apache.pig.tools.pigstats.mapreduce.SimplePigStats – Script
Statistics:
HadoopVersion PigVersion UserId StartedAt FinishedAt Features
2.6.0 0.15.0 hadoop 2016-10-05 17:25:57 2016-10-05 17:26:13 UNKNOWN
Failed!
Failed Jobs: JobId Alias Feature Message Outputs
job_1475669003352_0017 table_load MAP_ONLY Message: Job failed!
hdfs://mycluster/tmp/temp81690062/tmp2002161033,
Input(s): Failed to read data from “test_table_one”
Output(s): Failed to produce result in
“hdfs://mycluster/tmp/temp81690062/tmp2002161033”
Counters: Total records written : 0 Total bytes written : 0 Spillable
Memory Manager spill count : 0 Total bags proactively spilled: 0 Total
records proactively spilled: 0
Job DAG: job_1475669003352_0017
2016-10-05 17:26:13,883 [main] INFO
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher
– Failed! 2016-10-05 17:26:13,889 [main] ERROR
org.apache.pig.tools.grunt.Grunt – ERROR 1066: Unable to open iterator
for alias table_load Details at logfile:
/home/hadoop/pig_1475674706670.log
Can you help me to find why it is happening to me.?

Answer 1

Either use pig -useHCatalog or use pig and REGISTER the supporting JARS for HCAT to work with grunt.
You can find the required jars that are been shared into HDFS when you use pig -useHCatalog.

Answer 2

grunt> table_load = load ‘test_table_one’ USING org.apache.hive.hcatalog.pig.HCatLoader();
grunt> dump table_load;
This may be the reason that you haven't created Hive table with the exact name. Check the hive table and schema for the same.
Before using Hcatlog we have to create table schema on top on the location from where we are loading the data. uSE any queue name if require. Before executing please check for the table in hive.
Hope it will help. Try