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-rw-r--r--docs/configuration.md9
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diff --git a/docs/configuration.md b/docs/configuration.md
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--- a/docs/configuration.md
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@@ -481,6 +481,15 @@ Apart from these, the following properties are also available, and may be useful
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+ <td><code>spark.storage.unrollFraction</code></td>
+ <td>0.2</td>
+ <td>
+ Fraction of <code>spark.storage.memoryFraction</code> to use for unrolling blocks in memory.
+ This is dynamically allocated by dropping existing blocks when there is not enough free
+ storage space to unroll the new block in its entirety.
+ </td>
+</tr>
+<tr>
<td><code>spark.tachyonStore.baseDir</code></td>
<td>System.getProperty("java.io.tmpdir")</td>
<td>