GitHub user yanboliang opened a pull request:
https://github.com/apache/spark/pull/15888
[SPARK-18444][SPARKR] SparkR running in yarn-cluster mode should not
download Spark package.
## What changes were proposed in this pull request?
When running SparkR job in yarn-cluster mode, it will download Spark
package from apache website which is not necessary.
```
./bin/spark-submit --master yarn-cluster ./examples/src/main/r/dataframe.R
```
The following is output:
```
Attaching package: âSparkRâ
The following objects are masked from âpackage:statsâ:
cov, filter, lag, na.omit, predict, sd, var, window
The following objects are masked from âpackage:baseâ:
as.data.frame, colnames, colnames<-, drop, endsWith, intersect,
rank, rbind, sample, startsWith, subset, summary, transform, union
Spark not found in SPARK_HOME:
Spark not found in the cache directory. Installation will start.
MirrorUrl not provided.
Looking for preferred site from apache website...
......
```
There's no ```SPARK_HOME``` in yarn-cluster mode since the R process is in
a remote host of the yarn cluster rather than in the client host. The JVM comes
up first and the R process then connects to it. So in such cases we should
never have to download Spark as Spark is already running.
## How was this patch tested?
Offline test.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/yanboliang/spark spark-18444
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/15888.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 #15888
----
commit 16aa40086f8e2e58f7e3d7c3ec95a2e4d5967e5b
Author: Yanbo Liang <yblia...@gmail.com>
Date: 2016-11-15T10:01:38Z
SparkR running in yarn-cluster mode should not download Spark package.
----
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