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https://issues.apache.org/jira/browse/HADOOP-14686?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16102554#comment-16102554
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Allen Wittenauer commented on HADOOP-14686:
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It's an apples and oranges comparison, really. Docker images are (effectively)
built per-git hash. They are also cached with a one week expiry. trunk's is
very well cached because it gets used frequently. You can tell because of lots
of " ---> Using cache" lines in the 20424 build. The 12867 build uses a
different hash (since 2.7 and trunk have different requirements) and has nearly
nothing cached. Thus it is building completely from scratch. The location of
the Dockerfile is in dev-support/docker in the hadoop source tree if you'd like
to take a look at them.
> Branch-2.7 .gitignore is out of date
> ------------------------------------
>
> Key: HADOOP-14686
> URL: https://issues.apache.org/jira/browse/HADOOP-14686
> Project: Hadoop Common
> Issue Type: Bug
> Components: build, precommit
> Affects Versions: 2.7.4
> Reporter: Sean Busbey
> Assignee: Sean Busbey
> Priority: Blocker
> Fix For: 2.7.4
>
> Attachments: HADOOP-14686-branch-2.7.v0.patch,
> HADOOP-14686-branch-2.7.v1.patch
>
>
> .gitignore is out of date on branch-2.7, which is causing issues in precommit
> checks for that branch.
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