Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/16989#discussion_r116906572
--- Diff: docs/configuration.md ---
@@ -954,16 +970,16 @@ Apart from these, the following properties are also
available, and may be useful
<td><code>spark.memory.offHeap.enabled</code></td>
<td>false</td>
<td>
- If true, Spark will attempt to use off-heap memory for certain
operations. If off-heap memory use is enabled, then
<code>spark.memory.offHeap.size</code> must be positive.
+ If true, Spark will attempt to use off-heap memory for certain
operations(e.g. allocate memory by Unsafe/Tungsten code). If off-heap memory
use is enabled, then <code>spark.memory.offHeap.size</code> must be positive.
--- End diff --
```
If true, Spark will attempt to use off-heap memory for certain operations,
e.g. sort, aggregate, etc. However, the buffer used for fetching shuffle blocks
is always off-heap. ...
```
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