Grant Henke has submitted this change and it was merged. ( 
http://gerrit.cloudera.org:8080/16181 )

Change subject: [docker] Use ccache and Gradle cache across builds
......................................................................

[docker] Use ccache and Gradle cache across builds

This patch uses buildkits `--mount=type=cache` syntax to allow
the builds ccache and Gradle cache to be used across Docker builds.

This speeds up the Docker build when re-building the thirdparty,
C++, and Java modules and mirrors the best practices for
non-Docker based builds.

See the buildkit documentation for details:
https://github.com/moby/buildkit/blob/master/frontend/dockerfile/docs/experimental.md#run---mounttypecache

Below shows the runtime difference for subsequent builds of the
thirdparty target and Kudu target before and after this change:

`thirdparty` target:
- Before: 1:18:13
- After:    0:17:47

`kudu` target:
- Before: 0:19:10
- After:    0:04:08

Change-Id: Ie21ed47983b990e9d2aac419454b9a37a0600334
Reviewed-on: http://gerrit.cloudera.org:8080/16181
Tested-by: Kudu Jenkins
Reviewed-by: Bankim Bhavsar <[email protected]>
Reviewed-by: Greg Solovyev <[email protected]>
Reviewed-by: Attila Bukor <[email protected]>
---
M docker/Dockerfile
M docker/README.adoc
M docker/docker-build.py
3 files changed, 40 insertions(+), 13 deletions(-)

Approvals:
  Kudu Jenkins: Verified
  Bankim Bhavsar: Looks good to me, but someone else must approve
  Greg Solovyev: Looks good to me, but someone else must approve
  Attila Bukor: Looks good to me, approved

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Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-MessageType: merged
Gerrit-Change-Id: Ie21ed47983b990e9d2aac419454b9a37a0600334
Gerrit-Change-Number: 16181
Gerrit-PatchSet: 3
Gerrit-Owner: Grant Henke <[email protected]>
Gerrit-Reviewer: Andrew Wong <[email protected]>
Gerrit-Reviewer: Attila Bukor <[email protected]>
Gerrit-Reviewer: Bankim Bhavsar <[email protected]>
Gerrit-Reviewer: Grant Henke <[email protected]>
Gerrit-Reviewer: Greg Solovyev <[email protected]>
Gerrit-Reviewer: Kudu Jenkins (120)

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