Flag -useHCatalog not working - hadoop

Question

I installed CDH5.4 in single node following the instructions here, also, I put the hive-metastore in localmode using these instructions and everything works perfectly, except when I tried to connect pig with the metastore:
➜ ~ pig -useHCatalog
log4j:WARN No appenders could be found for logger (org.apache.hadoop.util.Shell).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
2015-05-01 15:45:08,657 [main] INFO org.apache.pig.Main - Apache Pig version 0.12.0-cdh5.4.0 (rUnversioned directory) compiled Apr 21 2015, 12:19:15
2015-05-01 15:45:08,658 [main] INFO org.apache.pig.Main - Logging error messages to: /home/itam/pig_1430495108571.log
2015-05-01 15:45:09,035 [main] INFO org.apache.hadoop.conf.Configuration.deprecation - mapred.job.tracker is deprecated. Instead, use mapreduce.jobtracker.address
2015-05-01 15:45:09,035 [main] INFO org.apache.hadoop.conf.Configuration.deprecation - fs.default.name is deprecated. Instead, use fs.defaultFS
2015-05-01 15:45:09,035 [main] INFO org.apache.pig.backend.hadoop.executionengine.HExecutionEngine - Connecting to hadoop file system at: hdfs://localhost:8020
2015-05-01 15:45:09,940 [main] INFO org.apache.hadoop.conf.Configuration.deprecation - mapred.job.tracker is deprecated. Instead, use mapreduce.jobtracker.address
2015-05-01 15:45:09,941 [main] INFO org.apache.pig.backend.hadoop.executionengine.HExecutionEngine - Connecting to map-reduce job tracker at: localhost:8021
2015-05-01 15:45:09,941 [main] INFO org.apache.hadoop.conf.Configuration.deprecation - fs.default.name is deprecated. Instead, use fs.defaultFS
2015-05-01 15:45:09,999 [main] INFO org.apache.hadoop.conf.Configuration.deprecation - fs.default.name is deprecated. Instead, use fs.defaultFS
2015-05-01 15:45:10,001 [main] INFO org.apache.hadoop.conf.Configuration.deprecation - mapred.job.tracker is deprecated. Instead, use mapreduce.jobtracker.address
2015-05-01 15:45:10,088 [main] INFO org.apache.hadoop.conf.Configuration.deprecation - fs.default.name is deprecated. Instead, use fs.defaultFS
2015-05-01 15:45:10,089 [main] INFO org.apache.hadoop.conf.Configuration.deprecation - mapred.job.tracker is deprecated. Instead, use mapreduce.jobtracker.address
2015-05-01 15:45:10,125 [main] INFO org.apache.hadoop.conf.Configuration.deprecation - fs.default.name is deprecated. Instead, use fs.defaultFS
2015-05-01 15:45:10,126 [main] INFO org.apache.hadoop.conf.Configuration.deprecation - mapred.job.tracker is deprecated. Instead, use mapreduce.jobtracker.address
2015-05-01 15:45:10,160 [main] INFO org.apache.hadoop.conf.Configuration.deprecation - fs.default.name is deprecated. Instead, use fs.defaultFS
2015-05-01 15:45:10,162 [main] INFO org.apache.hadoop.conf.Configuration.deprecation - mapred.job.tracker is deprecated. Instead, use mapreduce.jobtracker.address
2015-05-01 15:45:10,194 [main] INFO org.apache.hadoop.conf.Configuration.deprecation - fs.default.name is deprecated. Instead, use fs.defaultFS
2015-05-01 15:45:10,195 [main] INFO org.apache.hadoop.conf.Configuration.deprecation - mapred.job.tracker is deprecated. Instead, use mapreduce.jobtracker.address
2015-05-01 15:45:10,227 [main] INFO org.apache.hadoop.conf.Configuration.deprecation - fs.default.name is deprecated. Instead, use fs.defaultFS
2015-05-01 15:45:10,228 [main] INFO org.apache.hadoop.conf.Configuration.deprecation - mapred.job.tracker is deprecated. Instead, use mapreduce.jobtracker.address
2015-05-01 15:45:10,261 [main] INFO org.apache.hadoop.conf.Configuration.deprecation - fs.default.name is deprecated. Instead, use fs.defaultFS
2015-05-01 15:45:10,262 [main] INFO org.apache.hadoop.conf.Configuration.deprecation - mapred.job.tracker is deprecated. Instead, use mapreduce.jobtracker.address
2015-05-01 15:45:10,295 [main] INFO org.apache.hadoop.conf.Configuration.deprecation - fs.default.name is deprecated. Instead, use fs.defaultFS
2015-05-01 15:45:10,296 [main] INFO org.apache.hadoop.conf.Configuration.deprecation - mapred.job.tracker is deprecated. Instead, use mapreduce.jobtracker.address
and when I tried to access the table:
grunt> a = load 'ufos' using org.apache.hcatalog.pig.HCatLoader();
2015-05-01 15:46:11,656 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR 1070: Could not resolve org.apache.hcatalog.pig.HCatLoader using imports: [, java.lang., org.apache.pig.builtin., org.apache.pig.impl.builtin.]
Details at logfile: /home/itam/pig_1430495108571.log
grunt>
Hadoop version
➜ ~ hadoop version
Hadoop 2.6.0-cdh5.4.0
Subversion http://github.com/cloudera/hadoop -r c788a14a5de9ecd968d1e2666e8765c5f018c271
Compiled by jenkins on 2015-04-21T19:16Z
Compiled with protoc 2.5.0
From source with checksum cd78f139c66c13ab5cee96e15a629025
This command was run using /usr/lib/hadoop/hadoop-common-2.6.0-cdh5.4.0.jar
UPDATE: I just tried with Impala, and It neither sees anything:
➜ ~ impala-shell
/usr/lib/python2.7/dist-packages/pkg_resources.py:1049: UserWarning: /home/itam/.python-eggs is writable by group/others and vulnerable to attack when used with get_resource_filename. Consider a more secure location (set with .set_extracti
on_path or the PYTHON_EGG_CACHE environment variable).
warnings.warn(msg, UserWarning)
Starting Impala Shell without Kerberos authentication
Connected to 6b512e41337d:21000
Server version: impalad version 2.2.0-cdh5 RELEASE (build 2ffd73a4255cefd521362ffe1cfb37463f67f75c)
Welcome to the Impala shell. Press TAB twice to see a list of available commands.
Copyright (c) 2012 Cloudera, Inc. All rights reserved.
(Shell build version: Impala Shell v2.2.0-cdh5 (2ffd73a) built on Tue Apr 21 12:09:21 PDT 2015)
[6b512e41337d:21000] > invalidate metadata;
Query: invalidate metadata
[6b512e41337d:21000] > show tables;
Query: show tables
Fetched 0 row(s) in 0.00s
but from beeline:
~ beeline -u jdbc:hive2://
scan complete in 2ms
Connecting to jdbc:hive2://
Connected to: Apache Hive (version 1.1.0-cdh5.4.0)
Driver: Hive JDBC (version 1.1.0-cdh5.4.0)
Transaction isolation: TRANSACTION_REPEATABLE_READ
Beeline version 1.1.0-cdh5.4.0 by Apache Hive
0: jdbc:hive2://> show tables;
OK
+-----------+--+
| tab_name |
+-----------+--+
| ufos |
+-----------+--+
1 row selected (0.701 seconds)
It worked... What is happening?
UPDATE: I am running hcatalog too
➜ ~ sudo service hive-webhcat-server status
* WEBHCat server is running
➜ ~ hcat -e "desc ufos"
OK
timestamp string from deserializer
city string from deserializer
state string from deserializer
shape string from deserializer
duration string from deserializer
summary string from deserializer
posted string from deserializer
Time taken: 1.314 seconds
UPDATE: The problem with impala was due that I didn't copy hive-site.xml to /etc/impala/conf, once this is done, impala-shell worked properly.

Answer 1

The loader you are using is deprecated. Instead of using org.apache.hcatalog.pig.HCatLoader, you need to use org.apache.hive.hcatalog.pig.HCatLoader.
From org.apache.hcatalog.pig.HCatLoader:
Deprecated.
Use/modify HCatLoader instead

Answer 2

I was facing the issue in HDP 2.3 and Pig 0.15 .
Package name for HCatLoader() class is different in Hortonworks distribution.
The following worked for me
USING org.apache.hive.hcatalog.pig.HCatLoader()
instead of
USING org.apache.hcatalog.pig.HCatLoader();

Answer 3

like you started to see the issues you have is with hive-site.xmlfile - you need to place it in the classpath
As mention here:
A workflow action interacting with HCatalog requires the following
jars in the classpath: hcatalog-core.jar, webhcat-java-client.jar,
hive-common.jar, hive-exec.jar, hive-metastore.jar, hive-serde.jar and
libfb303.jar. hive-site.xml which has the configuration to talk to the
HCatalog server also needs to be in the classpath. The correct version
of HCatalog and hive jars should be placed in classpath based on the
version of HCatalog installed on the cluster.
The jars can be added to the classpath of the action using one of the
below ways.
You can place the jars and hive-site.xml in the system shared library.
The shared library for a pig, hive or java action can be overridden to
include hcatalog shared libraries along with the action's shared
library. Refer to Shared Libraries for more information. The
oozie-sharelib-[version].tar.gz in the oozie distribution bundles the
required HCatalog jars in a hcatalog sharelib. If using a different
version of HCatalog than the one bundled in the sharelib, copy the
required HCatalog jars from such version into the sharelib.
You can
place the jars and hive-site.xml in the workflow application lib/
path.
You can specify the location of the jar files in archive tag and
the hive-site.xml in file tag in the corresponding pig, hive or java
action.
If you are going to use Oozie coordinator, upload them to HDFS coordinator path