Github user ash211 commented on a diff in the pull request:
https://github.com/apache/spark/pull/880#discussion_r13115427
--- Diff: docs/configuration.md ---
@@ -151,41 +230,43 @@ Apart from these, the following properties are also
available, and may be useful
</td>
</tr>
<tr>
- <td><code>spark.storage.memoryMapThreshold</code></td>
- <td>8192</td>
+ <td><code>spark.shuffle.compress</code></td>
+ <td>true</td>
<td>
- Size of a block, in bytes, above which Spark memory maps when reading
a block from disk.
- This prevents Spark from memory mapping very small blocks. In general,
memory
- mapping has high overhead for blocks close to or below the page size
of the operating system.
+ Whether to compress map output files. Generally a good idea.
--- End diff --
Putting the compression algorithm here would be good. I think this is
controlled by a setting somewhere?
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