metrics: FileContext support overwrite mode
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Key: HADOOP-3753
URL: https://issues.apache.org/jira/browse/HADOOP-3753
Project: Hadoop Core
Issue Type: Improvement
Components: metrics
Reporter: Craig Macdonald
Priority: Minor
FileContext currently continually appends to the metrics log file(s),
generating an ever lengthening file.
In some scenarios, it would be useful to simply write the current statistics to
the file once every period, then overwrite the file for the next period.
For instance, this could be useful if an external application parsed the
metrics output - e.g. Cacti to create realtime graphs.
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