张焕明 created SPARK-29272:
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Summary: dataframe.write.format("libsvm").save() 保存时间太长
Key: SPARK-29272
URL: https://issues.apache.org/jira/browse/SPARK-29272
Project: Spark
Issue Type: Question
Components: ML
Affects Versions: 2.2.0
Reporter: 张焕明
我有一个pyspark的dataframe，小数据测试，只有3M，当调用
MLUtils.convertVectorColumnsToML(dataframe).write.format("libsvm").save('path'),
mode='overwrite')时，花费10秒，而当我用filter函数只筛选出10条数据再保存
temp_df =
dataframe.filter(train_df['__index'].between(int(0,10))，仍然需要8s的时间开销，为什么那么慢啊，我需要怎么改进吗
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