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diff --git a/docs/configuration.md b/docs/configuration.md
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+++ b/docs/configuration.md
@@ -885,6 +885,15 @@ Apart from these, the following properties are also available, and may be useful
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</tr>
<tr>
+ <td><code>spark.core.connection.ack.wait.timeout</code></td>
+ <td>60</td>
+ <td>
+ Number of seconds for the connection to wait for ack to occur before timing
+ out and giving up. To avoid unwilling timeout caused by long pause like GC,
+ you can set larger value.
+ </td>
+</tr>
+<tr>
<td><code>spark.ui.filters</code></td>
<td>None</td>
<td>