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https://issues.apache.org/jira/browse/HADOOP-18973?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17785999#comment-17785999
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ASF GitHub Bot commented on HADOOP-18973:
-----------------------------------------
adoroszlai opened a new pull request, #6273:
URL: https://github.com/apache/hadoop/pull/6273
## What changes were proposed in this pull request?
* Clean yum cache after installing `which` to reduce image size by ~230MB.
* Reorder installation of Hadoop and `which`. Hadoop release bits are not
going to change, but we may want to install other packages in the image. The
updated order reduces the number of image layers that have to be downloaded
after such future change.
https://issues.apache.org/jira/browse/HADOOP-18973
## How was this patch tested?
```
$ docker pull apache/hadoop:2
$ docker run -it --rm apache/hadoop:2 du -sh /var/cache/yum
234M /var/cache/yum
$ ./build.sh
...
Successfully built c88de0d4d5c2
Successfully tagged apache/hadoop:2
$ docker run -it --rm apache/hadoop:2 du -sh /var/cache/yum
64K /var/cache/yum
$ docker image ls | head -3
REPOSITORY TAG
IMAGE ID CREATED SIZE
apache/hadoop 2
c88de0d4d5c2 9 minutes ago 1.18GB
apache/hadoop <none>
ba716169c882 49 minutes ago 1.43GB
```
> Clean yum cache after installing which in hadoop2 docker image
> --------------------------------------------------------------
>
> Key: HADOOP-18973
> URL: https://issues.apache.org/jira/browse/HADOOP-18973
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Attila Doroszlai
> Assignee: Attila Doroszlai
> Priority: Minor
>
> Minor addendum to HADOOP-18970: clean yum cache after installing {{which}} to
> reduce image size by ~230MB.
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