Some Oozie actions – specifically DistCp, Streaming, Pig, Sqoop, and Hive – require external JAR files in order to run. Instead of having to keep these JAR files in each workflow's lib folder, or forcing you to manually manage them using the oozie.libpath property on every workflow using one of these actions, Oozie provides the ShareLib. The ShareLib behaves very similarly to oozie.libpath, except that it is specific to the aforementioned actions and their required JARs.

Continue reading:

• Redeploying the Oozie ShareLib Using Cloudera Manager
• Redeploying the Oozie ShareLib Using the Command Line