Add more Metrics to Namenode to capture heap usage
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Key: HADOOP-5897
URL: https://issues.apache.org/jira/browse/HADOOP-5897
Project: Hadoop Core
Issue Type: Improvement
Reporter: Suresh Srinivas
Assignee: Suresh Srinivas
Recently we had GC issues, where Namenode used more heap than usual. There was
no growth indicated by the data in current Metrics to justify the heap usage.
Adding more stats such as:
- Counter to track blocks that are pending deletion
- BlocksMap hashmap capacity
- Counter to track excess number of blocks
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