xukun created SPARK-11225:
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Summary: Prevent generate empty file
Key: SPARK-11225
URL: https://issues.apache.org/jira/browse/SPARK-11225
Project: Spark
Issue Type: Improvement
Components: Spark Core
Reporter: xukun
Priority: Minor
If no data will be written into the bucket, it will be generate empty files. So
open() must be called in the first write(key,value).
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