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From "zhaP524 (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-21776) How to use the memory-mapped file on Spark???
Date Fri, 18 Aug 2017 03:48:00 GMT

    [ https://issues.apache.org/jira/browse/SPARK-21776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16131672#comment-16131672
] 

zhaP524 commented on SPARK-21776:
---------------------------------

!screenshot-2.png!

> How to use the memory-mapped file on Spark???
> ---------------------------------------------
>
>                 Key: SPARK-21776
>                 URL: https://issues.apache.org/jira/browse/SPARK-21776
>             Project: Spark
>          Issue Type: Question
>          Components: Block Manager, Documentation, Input/Output
>    Affects Versions: 2.1.1
>         Environment: Spark 2.1.1 
> Scala 2.11.8
>            Reporter: zhaP524
>         Attachments: screenshot-1.png, screenshot-2.png
>
>
>       In generation, we have to use the Spark full quantity loaded HBase table based
on one dimension table to generate business, because the base table is total quantity loaded,
the memory will pressure is very big, I want to see if the Spark can use this way to deal
with memory mapped file?Is there such a mechanism?How do you use it?
>       And I found in the Spark a parameter: spark.storage.memoryMapThreshold=2m, is not
very clear what this parameter is used for?
>        There is a putBytes and getBytes method in DiskStore.scala with Spark source code,
is this the memory-mapped file mentioned above?How to understand??
>        Let me know if you have any trouble..
> Wish to You!!



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