[NIFI-1460] Test Performance improvement. Test Timeout Mitigation.

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.4.1
• Fix Version/s: 0.5.0
• Component/s: Core Framework, Tools and Build
• Labels: performance
• Environment: linux, unix with true random number generator.
• Flags: Important
• Assignee: Tony Kurc
• Reporter: Puspendu Banerjee
• Created: 02/Feb/16 22:56
• Updated: 04/Feb/16 02:53
• Resolved: 04/Feb/16 02:53

Description

Existing test case nifi-framework-core/src/test/java/org/apache/nifi/controller/TestStandardFlowFileQueue.java uses a huge number of call to UUID.randomUUID() which is very slow in linux , unix environment if there is not much activity [ like mouse move etc.] .In addition to that UUID.randomUUID() depends on /dev/(u)random to get a random number, such system call costs IO and /dev/random is bandwidth/rate limited which again slows down overall performance.

Workaround is rngd daemon(ref: http://linux.die.net/man/8/rngd)