Michael Brown has uploaded a new patch set (#6).

Change subject: IMPALA-4188: Leopard: support external Docker volumes
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IMPALA-4188: Leopard: support external Docker volumes

To be able to run the Random Query Generator with Impala and Kudu, we
need to use external Docker volumes as a workaround to KUDU-1419. This
patch introduces a series of environment variables a user may tweak in
order to help with that purpose. The patch assumes a viable, reasonable
Docker container based on a standard Linux distribution like Ubuntu 14.

To assist users, I've updated the Leopard README with instructions on
the environment variables' meanings.

The gist here is that the container is the source of truth, which means
to create an external volume, we need the testdata off the container
onto the host running Docker Engine. To do that we suggest a strategy
using rsync via passwordless SSH key.

Testing:
I used a Cloudera Docker container that has Impala in /home/dev/Impala.
Before, Kudu would fail to start due to KUDU-1419. Now, we load testdata
into an external volume, build Impala, run the minicluster including
Kudu, and can access the tpch_kudu data.

I made flake8 fixes as well. flake8 on this file is now clean.

Change-Id: Ia7d9d9253fcd7e3905e389ddeb1438cee3e24480
---
M tests/comparison/leopard/README
M tests/comparison/leopard/impala_docker_env.py
2 files changed, 199 insertions(+), 60 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/78/4678/6
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Ia7d9d9253fcd7e3905e389ddeb1438cee3e24480
Gerrit-PatchSet: 6
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Michael Brown <mi...@cloudera.com>
Gerrit-Reviewer: David Knupp <dkn...@cloudera.com>
Gerrit-Reviewer: Michael Brown <mi...@cloudera.com>
Gerrit-Reviewer: Taras Bobrovytsky <tbobrovyt...@cloudera.com>

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