[jira] [Created] (FLINK-8819) Rework travis script to use build stages

["Chesnay Schepler (JIRA)" <ji...@apache.org>]

Chesnay Schepler created FLINK-8819:
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             Summary: Rework travis script to use build stages
                 Key: FLINK-8819
                 URL: https://issues.apache.org/jira/browse/FLINK-8819
             Project: Flink
          Issue Type: Sub-task
          Components: Build System, Travis
            Reporter: Chesnay Schepler
            Assignee: Chesnay Schepler


This issue is for tracking efforts to rework our Travis scripts to use [stages|https://docs.travis-ci.com/user/build-stages/].

This feature allows us to define a sequence of jobs that are run one after another. This implies that we can define dependencies between jobs, in contrast to our existing jobs that have to be self-contained.

As an example, we could have a compile stage, and a test stage with multiple jobs.

The main benefit here is that we no longer have to compile modules multiple times, which would reduce our build times.

The major issue here however is that there is no _proper_ support for passing build-artifacts from one stage to the next. According to this [issue|https://github.com/travis-ci/beta-features/issues/28] it is on their to-do-list however.

In the mean-time we could manually transfer the artifacts between stages by either using the Travis cache or some other external storage.
 The major concern here is that of cleaning up the cache/storage.
 We can clean things up if
 * our script fails
 * the last stage succeeds.

We can *not* clean things up if
 * the build is canceled
 * travis fails the build due to a timeout or similar

as apparently there is [no way to run a script at the end of a build|https://github.com/travis-ci/travis-ci/issues/4221].



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