Tuesday, January 6, 2015

How to add auxiliary JARs into Hive


Sometimes we need to add auxiliary JARs into Hive classpath.
For example, using customized SERDE JARs or Hive integration with other applications.
This article shows how to add JARs into Hive classpath.


Firstly the JAR files should be accessible by all hadoop nodes.

1. Hive server(HS1 or HS2)

Modify /opt/mapr/hive/hive-<version>/conf/hive-site.xml to add parameter hive.aux.jars.path.
The value is comma separated.
For example:
And then restart the Hive server.
For HS1, kill the hive process and :
nohup hive --service hiveserver &
For HS2:
maprcli node services -name hs2 -action stop -nodes <hostname>
maprcli node services -name hs2 -action start -nodes <hostname>

2.Hive shell

a. Add the JAR in hive shell:
ADD JAR <jar_path>; 
For example:
hive> ADD JAR /opt/mapr/hive/hive-0.13/aux/hive-json-serde-0.2.jar;
Added /opt/mapr/hive/hive-0.13/aux/hive-json-serde-0.2.jar to class path
Added resource: /opt/mapr/hive/hive-0.13/aux/hive-json-serde-0.2.jar
hive> list jars;
b. Use option "--auxpath":
hive --auxpath <path_to_jar>,<path_to_jar2>
For example:
hive --auxpath /opt/mapr/hive/hive-0.13/aux/hive-json-serde-0.2.jar
c. Use environment variable HIVE_AUX_JARS_PATH before launching hive command:
export HIVE_AUX_JARS_PATH=<path_to_jar>,<path_to_jar2>
For example:
export HIVE_AUX_JARS_PATH=/opt/mapr/hive/hive-0.13/aux/hive-json-serde-0.2.jar

No comments:

Post a Comment

Popular Posts