Github user pwendell commented on a diff in the pull request:
https://github.com/apache/spark/pull/377#discussion_r11500167
--- Diff: docs/configuration.md ---
@@ -103,23 +103,30 @@ Apart from these, the following properties are also
available, and may be useful
</td>
</tr>
<tr>
+ <td>spark.system.reservedMemorySize</td>
+ <td>300m</td>
+ <td>
+ Amount of Heap to reserve for Spark's internal components, before
calculating memory available for storage
+ and shuffle as configured in <code>spark.storage.memoryFraction</code>
and <code>spark.shuffle.memoryFraction</code>
+ </td>
+</tr>
+<tr>
<td>spark.storage.memoryFraction</td>
<td>0.6</td>
<td>
- Fraction of Java heap to use for Spark's memory cache. This should not
be larger than the "old"
- generation of objects in the JVM, which by default is given 0.6 of the
heap, but you can increase
- it if you configure your own old generation size.
+ Fraction of Java heap to use for Spark's memory cache, after
accounting for <code>spark.system.reservedMemorySize</code>.
+ The effective size should not be larger than the "old"generation of
objects in the JVM.
--- End diff --
missing space here: `"old" generation`
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