[NIFI-1374] need to better document Java 7 class and codecache limitation in Admin Guide

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 0.5.0
• Component/s: Core Framework
• Labels: beginner newbie
• Assignee: Joe Witt
• Reporter: Matthew Clarke
• Created: 08/Jan/16 16:55
• Updated: 10/Jan/16 19:50
• Resolved: 10/Jan/16 19:50

Description

The documentation provided in NiFi does not include enough information on the default limitations of Java 7 that can offer result in Out of Memory: Permgen conditions. The Admin Guide should be updated in 2 places:
1. under system Requirements we should add a note about using Java 7 and point them to additional guidance under the bootstrap properties section.
2, In the bootstrap properties section we should document the commented out java 7 properties in the file and explain why they should have they should be used when running with Java 7.

Further, the codecache issues present in Java 7 and Java 8 also warrant commentary as the results can be terrible and extremely hard to figure out.