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https://issues.apache.org/jira/browse/SPARK-5073?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16131667#comment-16131667
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zhaP524 commented on SPARK-5073:
--------------------------------

I wonder what this parameter is for?Also want to know if this parameter is 
related to the memory-mapped file?I hope You can tell you the trouble.

> "spark.storage.memoryMapThreshold" has two default values
> ---------------------------------------------------------
>
>                 Key: SPARK-5073
>                 URL: https://issues.apache.org/jira/browse/SPARK-5073
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core
>    Affects Versions: 1.2.0
>            Reporter: Jianhui Yuan
>            Priority: Minor
>
> In org.apache.spark.storage.DiskStore:
>      val minMemoryMapBytes = 
> blockManager.conf.getLong("spark.storage.memoryMapThreshold", 2 * 4096L)
> In org.apache.spark.network.util.TransportConf:
>      public int memoryMapBytes() {
>          return conf.getInt("spark.storage.memoryMapThreshold", 2 * 1024 * 
> 1024);
>      }



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