koertkuipers commented on issue #25739: [WIP][SPARK-28945][CORE][SQL] Support concurrent dynamic partition writes to different partitions in the same table URL: https://github.com/apache/spark/pull/25739#issuecomment-529995923 > > my understanding is that currently if you don't have dynamic partition overwrite enabled it will always delete all partitions before writing. > > IIRC, dynamic partition writing without dynamicPartitionOverwrite enabled, Spark will delete matching partitions(partitions prefixed by the static partition), not all partitions. > > For example, when insert overwrite `Partition(day=20190910, hour=01, action)`, Spark will first delete all the partitions under `$some/path/to/table/location/day=20190910/hour=01` when i need to overwrite a particular partition in a filesource such as parquet i will write directly to the partition path, e.g.: ``` df.write.format("parquet").save("some/path/to/table/location/day=20190910/hour=01") ``` but in that case concurrency already works, as the writers do not use the same baseDir. i was not aware that there is an alternative syntax or way of doing this without dynamic partition overwrite. sorry for the confusion.
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