[Hadoop-common-dev] [jira] Created: (HADOOP-3888) Clean up the JobTracker code

Clean up the JobTracker code
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Key: HADOOP-3888
URL: https://issues.apache.org/jira/browse/HADOOP-3888
Project: Hadoop Core
Issue Type: Improvement
Components: mapred
Affects Versions: 0.19.0
Reporter: Steve Loughran
Priority: Minor
Original Estimate: 1h
Remaining Estimate: 1h

My IDE flags a lot of trouble in the JobTracker code, but I dont want to mix those changes with any lifecycle changes. After doing that, then I'd like to clean up the code in JobTracker
-move to generic types and foreach loops over Vector and iterators.
-give all threads the correct type
-stop using package scoped static variables to pass instance-data around specifically
TASKTRACKER_EXPIRY_INTERVAL
RETIRE_JOB_CHECK_INTERVAL
RETIRE_JOB_INTERVAL
-fix up all the javadoc warnings
-remove the needless this. references on lots of local variables
-replace the log + stringifyException with log(text,exception).
Its only an hour or so of work, and would improve the code maintainability, but it would make merging existing code harder.