[MAPREDUCE-1593] [Rumen] Improvements to random seed generation

• Type: Improvement
• Status: Closed
• Priority: Trivial
• Resolution: Fixed
• Affects Version/s: 0.21.0, 0.22.0
• Fix Version/s: 0.21.0
• Component/s: tools/rumen
• Hadoop Flags: Reviewed
• Assignee: Tamas Sarlos
• Reporter: Tamas Sarlos
• Created: 11/Mar/10 22:35
• Updated: 24/Aug/10 21:21
• Resolved: 18/Mar/10 21:01

Description

RandomSeedGenerator introduced in MAPREDUCE-1306 could be more efficient by reusing the MD5 object across calls. Wrapping the MD5 in a ThreadLocal makes the call thread safe as well. Neither of these is an issue with the current client, the mumak simulator, but the changes are small and make the code more useful in the future. Thanks to Chris Douglas for the suggestion.