Github user chandnisingh commented on the pull request:
https://github.com/apache/incubator-apex-core/pull/190#issuecomment-166792565
Added the Proxy for MetricsAggregator.
Moved MetricAggregatorMeta out of LogicalPlan as that class is more than
2000 lines.
Made MetricsAggregatorProxy nested class of MetricsAggregatorMeta
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