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[jira] [Created] (ARROW-2563) [Rust] Poor caching in Travis-CI

Antoine Pitrou created ARROW-2563:

             Summary: [Rust] Poor caching in Travis-CI
                 Key: ARROW-2563
                 URL: https://issues.apache.org/jira/browse/ARROW-2563
             Project: Apache Arrow
          Issue Type: Improvement
          Components: Continuous Integration, Rust
            Reporter: Antoine Pitrou

Since the Rust project isn't at the repo root, Travis-CI won't compiled cache artifacts by default. This leads to long CI times as all packages get recompiled (see https://docs.travis-ci.com/user/caching/#Rust-Cargo-cache for what gets cached).

In https://travis-ci.org/pitrou/arrow/jobs/376859806 I tried the following:

and after a first run, the build time went down to 2 minutes (from 15-18 minutes).

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