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From pwendell <>
Subject [GitHub] spark pull request: [WIP] Spark-1392: Add parameter to reserve min...
Date Thu, 10 Apr 2014 18:37:26 GMT
Github user pwendell commented on a diff in the pull request:
    --- Diff: docs/ ---
    @@ -103,23 +103,30 @@ Apart from these, the following properties are also available, and
may be useful
    +  <td>spark.system.reservedMemorySize</td>
    +  <td>300m</td>
    +  <td>
    +    Amount of Heap to reserve for Spark's internal components, before calculating memory
available for storage 
    +    and shuffle as configured in <code></code>
and <code>spark.shuffle.memoryFraction</code>
    +  </td>
    -    Fraction of Java heap to use for Spark's memory cache. This should not be larger
than the "old"
    -    generation of objects in the JVM, which by default is given 0.6 of the heap, but
you can increase
    -    it if you configure your own old generation size.
    +    Fraction of Java heap to use for Spark's memory cache, after accounting for <code>spark.system.reservedMemorySize</code>.
    +    The effective size should not be larger than the "old"generation of objects in the
    --- End diff --
    missing space here: `"old" generation`

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