GitHub user zsxwing opened a pull request:
https://github.com/apache/spark/pull/3671
[SPARK-4824][Core] Add 'iterator' to reduce memory consumed by join
In Scala, `map` and `flatMap` of `Iterable` will copy the contents of
`Iterable` to a new `Seq`. Such as,
```Scala
val iterable = Seq(1, 2, 3).map(v => {
println(v)
v
})
println("Iterable map done")
val iterator = Seq(1, 2, 3).iterator.map(v => {
println(v)
v
})
println("Iterator map done")
```
outputed
```
1
2
3
Iterable map done
Iterator map done
```
So we should use 'iterator' to reduce memory consumed by join.
Found by Johannes Simon in
http://mail-archives.apache.org/mod_mbox/spark-user/201412.mbox/%3C5BE70814-9D03-4F61-AE2C-0D63F2DE4446%40mail.de%3E
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/zsxwing/spark SPARK-4824
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/3671.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #3671
----
commit 95d59d697a7f2fabd877dac864e9dff8d1011d5a
Author: zsxwing <[email protected]>
Date: 2014-12-11T02:42:02Z
Add 'iterator' to reduce memory consumed by join
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