Github user shivaram commented on a diff in the pull request:
https://github.com/apache/spark/pull/10290#discussion_r47676426
--- Diff: docs/sparkr.md ---
@@ -148,7 +148,7 @@ printSchema(people)
</div>
The data sources API can also be used to save out DataFrames into multiple
file formats. For example we can save the DataFrame from the previous example
-to a Parquet file using `write.df`
+to a Parquet file using `write.df` (Before spark 1.7, mode's default value
is 'append', we change it to 'error' to be consistent with scala api)
--- End diff --
Could you reword this to
```
Until Spark 1.6, the default mode for writes was `append`. It was changed
in Spark {{site.SPARK_VERSION_SHORT}} to `error` to match the Scala API
```
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