srowen commented on a change in pull request #25689: [SPARK-28972][DOCS] 
Describe unit for `spark.memory.offHeap.size`
URL: https://github.com/apache/spark/pull/25689#discussion_r324677850
 
 

 ##########
 File path: docs/configuration.md
 ##########
 @@ -1207,16 +1207,18 @@ Apart from these, the following properties are also 
available, and may be useful
   <td><code>spark.io.compression.lz4.blockSize</code></td>
   <td>32k</td>
   <td>
-    Block size in bytes used in LZ4 compression, in the case when LZ4 
compression codec
+    Block size used in LZ4 compression, in the case when LZ4 compression codec
     is used. Lowering this block size will also lower shuffle memory usage 
when LZ4 is used.
+    Default unit is bytes, unless otherwise specified.
   </td>
 </tr>
 <tr>
   <td><code>spark.io.compression.snappy.blockSize</code></td>
   <td>32k</td>
   <td>
-    Block size in bytes used in Snappy compression, in the case when Snappy 
compression codec
-    is used. Lowering this block size will also lower shuffle memory usage 
when Snappy is used.
+    Block size in Snappy compression, in the case when Snappy compression 
codecis used. 
 
 Review comment:
   codecis -> codec is

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