nwangtw opened a new pull request #3355: Add a cap to metrics communicator in TMasterSink and MetricsCacheSink URL: https://github.com/apache/incubator-heron/pull/3355 Without the cap, when MetricsCacheSink is enabled but MetricsCache is not running, the communication will keep growing. The same thing could happen with TMaster but it is less likely to have the problem.
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