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https://issues.apache.org/jira/browse/HBASE-22924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17643132#comment-17643132
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Shanky Sharma commented on HBASE-22924:
---------------------------------------

Thank you [~zhangduo] for the clarification. So the change might also require 
removing the current shell script solution. I will wait for [~busbey] comment 
and move ahead accordingly.

> GitHUB PR job should use when clause to filter to just PRs.
> -----------------------------------------------------------
>
>                 Key: HBASE-22924
>                 URL: https://issues.apache.org/jira/browse/HBASE-22924
>             Project: HBase
>          Issue Type: Improvement
>          Components: build, community
>            Reporter: Sean Busbey
>            Priority: Minor
>              Labels: beginner
>
> Right now the GitHub PR checking job uses a Jenkins environment variable to 
> stop branch builds:
> {code}
>                         # If CHANGE_URL is set (e.g., Github Branch Source 
> plugin), process it.
>                         # Otherwise exit, because we don't want HBase to do a
>                         # full build.  We wouldn't normally do this check for 
> smaller
>                         # projects. :)
>                         if [[ -z "${CHANGE_URL}" ]]; then
>                             echo "Full build skipped" > 
> "${WORKSPACE}/${PATCHDIR}/report.html"
>                             exit 0
>                         fi
> {code}
> instead we should use a Jenkinsfile {{when}} clause 
> ([ref|https://jenkins.io/doc/book/pipeline/syntax/#when]) and the 
> {{changeRequest()}} filter to say we want to build PRs. Assuming the eventual 
> adaptation of the JIRA precommit job properly sets that it's testing a change 
> this should also help reuse there.
> {code}
>   stage ('precommit-run') {
>     when { changeRequest() }
>     steps {
>       ...
>     }
>   }
> {code}
> it would also be nice to fold things into a single stage so that we skip the 
> yetus checkout when we're not going to run tests.



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