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https://issues.apache.org/jira/browse/SPARK-10199?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Feynman Liang updated SPARK-10199:
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Description:
Multiple model save/load in MLlib use case classes to infer a schema for the
data frame saved to Parquet. However, inferring a schema from case classes uses
[runtime
reflection|https://github.com/apache/spark/blob/d7b4c095271c36fcc7f9ded267ecf5ec66fac803/sql/core/src/main/scala/org/apache/spark/sql/SQLContext.scala#L361]
which is unnecessary since the types are already known at the time `save` is
called.
It would be better to just specify the schema for the data frame directly using
`sqlContext.createDataFrame(dataRDD, schema)`.
was:
Multiple model save/load in ML use case classes to infer a schema for the data
frame saved to Parquet. However, inferring a schema from case classes uses
[runtime
reflection|https://github.com/apache/spark/blob/d7b4c095271c36fcc7f9ded267ecf5ec66fac803/sql/core/src/main/scala/org/apache/spark/sql/SQLContext.scala#L361]
which is unnecessary since the types are already known at the time `save` is
called.
It would be better to just specify the schema for the data frame directly using
`sqlContext.createDataFrame(dataRDD, schema)`.
> Avoid using reflections for parquet model save
> ----------------------------------------------
>
> Key: SPARK-10199
> URL: https://issues.apache.org/jira/browse/SPARK-10199
> Project: Spark
> Issue Type: Improvement
> Components: ML, MLlib
> Reporter: Feynman Liang
>
> Multiple model save/load in MLlib use case classes to infer a schema for the
> data frame saved to Parquet. However, inferring a schema from case classes
> uses [runtime
> reflection|https://github.com/apache/spark/blob/d7b4c095271c36fcc7f9ded267ecf5ec66fac803/sql/core/src/main/scala/org/apache/spark/sql/SQLContext.scala#L361]
> which is unnecessary since the types are already known at the time `save` is
> called.
> It would be better to just specify the schema for the data frame directly
> using `sqlContext.createDataFrame(dataRDD, schema)`.
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