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https://issues.apache.org/jira/browse/ARROW-2563?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16469540#comment-16469540
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Antoine Pitrou commented on ARROW-2563:
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{quote}I've seen this before but not sure whether it is related to caching:
could you restart the job and see if this happens consistently?{quote}
I've restarted it twice already. Feel free to try on your side. The branch I
tried this on is unrelated, I was just surprised by the Rust compilation times
and experimented a bit.
> [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
> Priority: Major
>
> 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:
> {code}
> export CARGO_TARGET_DIR=$TRAVIS_BUILD_DIR/target
> {code}
> and after a first run, the build time went down to 2 minutes (from 15-18
> minutes).
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