Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/21825#discussion_r206126633
--- Diff: docs/configuration.md ---
@@ -1215,6 +1215,13 @@ Apart from these, the following properties are also
available, and may be useful
if it is too small, <code>BlockManager</code> might take a performance
hit.
</td>
</tr>
+<tr>
+ <td><code>spark.broadcast.checksum</code></td>
+ <td>true</td>
+ <td>
+ Controls whether to enable checksum for broadcast.
--- End diff --
If this is going to be documented, it should be documented in a way that's
useful for end users. This typically means describing what turning it on and
off does from an end-user perspective. Does it make things faster, slower? more
reliable, compatible, etc? This description here pretty much reiterates what's
in the property key itself.
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