Change ChukwaJobInstrumentation class to use the new API for getting job
history file name.
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Key: CHUKWA-256
URL: https://issues.apache.org/jira/browse/CHUKWA-256
Project: Hadoop Chukwa
Issue Type: Improvement
Components: data collection
Environment: Redhat EL 5.1, Java 6
Reporter: Eric Yang
Hadoop getJobHistoryFileName has scability problem, the entire method is in a
synchronized block. When there are too many files existed in the log
directory, this method takes a very long time to return the file name. This
could cause the job tracker to run very slowly.
There is a new API put in place (HADOOP-4372) getNewJobHistoryFileName should
be much more lightweight and work for Chukwa Jobtracker Instrumentation API.
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