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https://issues.apache.org/jira/browse/SPARK-26052?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen updated SPARK-26052:
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Priority: Minor (was: Major)
Issue Type: Improvement (was: Bug)
> Spark should output a _SUCCESS file for every partition correctly written
> -------------------------------------------------------------------------
>
> Key: SPARK-26052
> URL: https://issues.apache.org/jira/browse/SPARK-26052
> Project: Spark
> Issue Type: Improvement
> Components: Block Manager
> Affects Versions: 2.3.0
> Reporter: Matt Matolcsi
> Priority: Minor
>
> When writing a set of partitioned Parquet files to HDFS using
> dataframe.write.parquet(), a _SUCCESS file is written to hdfs://path/to/table
> after successful completion, though the actual Parquet files will end up in
> hdfs://path/to/table/partition_key1=val1/partition_key2=val2/....
> If partitions are written out one at a time (e.g., an hourly ETL), the
> _SUCCESS file is overwritten by each subsequent run and information on what
> partitions were correctly written is lost.
> I would like to be able to keep track of what partitions were successfully
> written in HDFS. I think this could be done by writing the _SUCCESS files to
> the same partition directories where the Parquet files reside, i.e.,
> hdfs://path/to/table/partition_key1=val1/partition_key2=val2/....
> Since https://issues.apache.org/jira/browse/SPARK-13207 has been resolved, I
> don't think this should break partition discovery.
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