NameNode to report frequency, length, and type of garbage collection
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Key: HADOOP-3167
URL: https://issues.apache.org/jira/browse/HADOOP-3167
Project: Hadoop Core
Issue Type: Improvement
Reporter: Marco Nicosia
Priority: Minor
Right now, we don't know for how long, nor how frequently, the Hadoop NameNode
engages in garbage collection. We can re-constitute this data from logs, but
it'd be much better if Hadoop could report this as a metric along with all
other metrics reported, so we can graph these alongside.
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