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https://issues.apache.org/jira/browse/SPARK-16008?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Seth Hendrickson updated SPARK-16008:
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Issue Type: Improvement (was: Bug)
> ML Logistic Regression aggregator serializes unnecessary data
> -------------------------------------------------------------
>
> Key: SPARK-16008
> URL: https://issues.apache.org/jira/browse/SPARK-16008
> Project: Spark
> Issue Type: Improvement
> Components: ML
> Reporter: Seth Hendrickson
>
> LogisticRegressionAggregator class is used to collect gradient updates in ML
> logistic regression algorithm. The class stores a reference to the
> coefficients array of length equal to the number of features. It also stores
> a reference to an array of standard deviations which is length numFeatures
> also. When a task is completed it serializes the class which also serializes
> a copy of the two arrays. These arrays don't need to be serialized (only the
> gradient updates are being aggregated). This causes issues performance issues
> when the number of features is large and can trigger excess garbage
> collection when the executor doesn't have much excess memory.
> This results in serializing 2*numFeatures excess data. When multiclass
> logistic regression is implemented, the excess will be numFeatures +
> numClasses * numFeatures.
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