Github user cricket007 commented on the issue:
https://github.com/apache/nifi/pull/1372
Why is this image so large? Did someone not realize that `chown` is
doubling the layer that downloads the binary?
`docker history --no-trunc apache/nifi:1.3.0`
```
3 GID=50 NIFI_VERSION=1.3.0 UID=1000 /bin/sh -c chown -R nifi:nifi
$NIFI_HOME => 983 MB
3 GID=50 NIFI_VERSION=1.3.0 UID=1000 /bin/sh -c curl -fSL $NIFI_BINARY_URL
-o $NIFI_BASE_DIR/nifi-$NIFI_VERSION-bin.tar.gz ... => 983 MB
```
For comparison, I have built this myself (granted, using openjdk-alpine and
without switching user accounts), but still, a 2.4x size difference!
```
local/nifi 1.3.0 f28ea17bf37b 15 minutes ago
1.07 GB
apache/nifi 1.3.0 ccd137e275bc 32 hours ago
2.58 GB
```
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