Zhe Zhang created HADOOP-13747:
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Summary: Use LongAdder for more efficient metrics tracking
Key: HADOOP-13747
URL: https://issues.apache.org/jira/browse/HADOOP-13747
Project: Hadoop Common
Issue Type: Improvement
Components: metrics
Reporter: Zhe Zhang
Assignee: Erik Krogen
Currently most metrics, including {{RpcMetrics}} and {{RpcDetailedMetrics}},
use a synchronized counter to be updated by all handler threads (multiple
hundreds in large production clusters). As [~andrew.wang] suggested, it'd be
more efficient to use the [LongAdder |
http://gee.cs.oswego.edu/cgi-bin/viewcvs.cgi/jsr166/src/jsr166e/LongAdder.java?view=co]
library which dynamically create intermediate-result variables.
Assigning to [~xkrogen] who has already done some investigation on this.
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