squito commented on issue #23767: [SPARK-26329][CORE][WIP] Faster polling of executor memory metrics. URL: https://github.com/apache/spark/pull/23767#issuecomment-465753529 btw we should probably also update the docs on `ExecutorMetricType` to explain threading concerns, as its less clear now. IIUC, implementations do *not* need to be thread-safe currently -- they will only be called by one thread at a time.
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