Hello Kudu Jenkins, Andrew Wong, Bankim Bhavsar,

I'd like you to reexamine a change. Please visit

    http://gerrit.cloudera.org:8080/16181

to look at the new patch set (#2).

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
---
M docker/Dockerfile
M docker/README.adoc
M docker/docker-build.py
3 files changed, 40 insertions(+), 13 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/81/16181/2
--
To view, visit http://gerrit.cloudera.org:8080/16181
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Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Ie21ed47983b990e9d2aac419454b9a37a0600334
Gerrit-Change-Number: 16181
Gerrit-PatchSet: 2
Gerrit-Owner: Grant Henke <[email protected]>
Gerrit-Reviewer: Andrew Wong <[email protected]>
Gerrit-Reviewer: Bankim Bhavsar <[email protected]>
Gerrit-Reviewer: Kudu Jenkins (120)

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