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https://issues.apache.org/jira/browse/ARROW-4785?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16785545#comment-16785545
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Hatem Helal commented on ARROW-4785:
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Here are a couple recent examples from a travis build:
[https://travis-ci.org/apache/arrow/jobs/502285685#L492]
[https://travis-ci.org/apache/arrow/jobs/502285699#L973]
> [CI] Make Travis CI resilient against hash sum mismatch errors
> --------------------------------------------------------------
>
> Key: ARROW-4785
> URL: https://issues.apache.org/jira/browse/ARROW-4785
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Continuous Integration
> Reporter: Hatem Helal
> Priority: Minor
> Labels: ci-failure
>
> Travis Jobs sometime fail with a GPG error:
> {code:java}
> W: An error occurred during the signature verification. The repository is not
> updated and the previous index files will be used. GPG error:
> https://packagecloud.io/github/git-lfs/ubuntu trusty InRelease: The following
> signatures couldn't be verified because the public key is not available:
> NO_PUBKEY 6B05F25D762E3157W: Failed to fetch
> https://packagecloud.io/github/git-lfs/ubuntu/dists/trusty/InRelease The
> following signatures couldn't be verified because the public key is not
> available: NO_PUBKEY 6B05F25D762E3157E: Failed to fetch
> http://security.ubuntu.com/ubuntu/dists/trusty-security/main/binary-i386/Packages.gz
> Hash Sum mismatchW: Some index files failed to download. They have been
> ignored, or old ones used instead.The command "if [ $TRAVIS_OS_NAME ==
> "linux" ]; then{{ sudo bash -c "echo -e 'Acquire::Retries 10;
> Acquire::http::Timeout \"20\";' > /etc/apt/apt.conf.d/99-travis-retry"}}{{
> sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test}}{{ sudo apt-get
> update -qq}}{{ fi}}{{ " failed and exited with 100 during .}} Your build has
> been stopped.{code}
> It would be nice if the number of retries, timeout, or both could be
> increased to make the travis jobs more resilient to this seemingly sporadic
> issue.
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