Github user darabos commented on the issue:
https://github.com/apache/spark/pull/13618
Thanks Sean! 0.66 would probably work well. But I think @gaborfeher tested
only with 0.6, and this value seemed to be the conclusion on JIRA
([comment](https://issues.apache.org/jira/browse/SPARK-15796?focusedCommentId=15318526&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15318526)).
If you're updating the documentation files anyway, how about copying the
line from `spark.storage.memoryFraction` to `spark.memory.fraction`? It's good
advice:
> 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.
Thanks!
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