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[SPARK-25312][Documentation, Spark Core] Add description for the conf… #22322

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9 changes: 9 additions & 0 deletions docs/security.md
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Expand Up @@ -81,6 +81,15 @@ The following table describes the different options available for configuring th
algorithms supported by the javax.crypto.SecretKeyFactory class in the JRE being used.
</td>
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<tr>
<td><code>spark.network.crypto.keyFactoryIterations</code></td>
<td>1024</td>
<td>
The number of iterations to run when generating keys. The default value was picked for speed,
assuming that a secret has good entropy. Should be used maximum number of iterations which have
negligible impact on the system.
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<tr>
<td><code>spark.network.crypto.config.*</code></td>
<td>None</td>
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