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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