Hi Everybody,
I am using Apache's Hadoop-0.20.2 and Apache's
Hive-0.7.0. I have a 2 node cluster. One Redhat Linux 6.0(Hadoop Server) and
other Windows 7 using Cygwin. The Hadoop cluster is working fine. I have
checked by executing various examples provided with Hadoop. Map reduce jobs are
being executed fine. For Hive I am using MySQL for metastore with following
configuration is hive-site.xml :
<property>
<name>javax.jdo.option.ConnectionURL</name>
<value>jdbc:mysql://localhost:3306/metastore?createDatabaseIfNotExist=true</value>
</property>
<property>
<name>javax.jdo.option.ConnectionDriverName</name>
<value>com.mysql.jdbc.Driver</value>
</property>
<property>
<name>javax.jdo.option.ConnectionUserName</name>
<value>hiveuser</value>
</property>
<property>
<name>javax.jdo.option.ConnectionPassword</name>
<value>hiveuser</value>
</property>
<property>
<name>datanucleus.autoCreateSchema</name>
<value>false</value>
</property>
<property>
<name>datanucleus.fixedDatastore</name>
<value>true</value>
</property>
I created the DB and hiveuser in mysql using following commands:
mysql> CREATE DATABASE metastore;
mysql> USE metastore;
mysql> SOURCE
/usr/local/hive/scripts/metastore/upgrade/mysql/hive-schema-0.7.0.mysql.sql;
mysql> CREATE USER 'hiveuser'@'%' IDENTIFIED BY 'hiveuser';
mysql> GRANT ALL ON metastore.* TO 'hiveuser'@'%';
I created a table using the following command on hive:
hive> Create table abcd(ab int, cd string) row format delimited fields
terminated by '#' stored as textfile;
Then I created a file abcddata.txt containing the following data
11#aa
22#bb
33#cc
Then I loaded this data into table abcd using :
Hive> Load sata local inpath 'path/to/abcd.txt' into table abcd;
Now when I execute "select * from abcd" it runs successfully and shows the data
in abcd.
But if I run "select ab from abcd" or " select * from abcd where cd='aa'" it
returns error:
FAILED: Execution Error, return code 2 from
org.apache.hadoop.hive.ql.exec.MapRedTask
In the logs I found:
Caused by: java.util.NoSuchElementException
at java.util.Vector.lastElement(Vector.java:456)
at com.sun.beans.ObjectHandler.lastExp(ObjectHandler.java:134)
at com.sun.beans.ObjectHandler.dequeueResult(ObjectHandler.java:138)
at java.beans.XMLDecoder.readObject(XMLDecoder.java:201)
at
org.apache.hadoop.hive.ql.exec.Utilities.deserializeMapRedWork(Utilities.java:462)
at
org.apache.hadoop.hive.ql.exec.Utilities.getMapRedWork(Utilities.java:184)
And when I tried to access Hive from a java program using connection string:
(jdbc:mysql://master:3306/metastore","hiveuser","hiveuser")
Running command "describe abcd" it returns:
Exception in thread "main"
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table
'metastore.abcd' doesn't exist
Then on the mysql server I ran:
mysql> use metastore;
mysql> show tables;
The table abcd is not there. The table is not being stored in the mysql
metastore db.
So how come on Hive CLI, when I do "select * from abcd" it shows the data in
the table. And "show tables" shows abcd there. It means Hive CLI is not using
the mysql metastore for storing and "select *" statement but whenever it's a
statement that requires map reduce jobs or while accessing via java program
using connection string it uses mysql metastore. It must be some configuration
mistake I think. Please help me out.
Regards,
Aditya Singh
Infosys, India.
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