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https://issues.apache.org/jira/browse/HDFS-1935?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13032831#comment-13032831
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Jolly Chen commented on HDFS-1935:
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Doesn't usetimestamps="true" already do the trick?
If you really don't want to depend on ant 1.8.0, you can use a
condition-available trick as is already one with the ant-eclipse.jar.exists
property elsewhere in the build file.
> Build should not redownload ivy on every invocation
> ---------------------------------------------------
>
> Key: HDFS-1935
> URL: https://issues.apache.org/jira/browse/HDFS-1935
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: 0.22.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Priority: Trivial
> Fix For: 0.22.0
>
> Attachments: hdfs-1935.txt
>
>
> Currently we re-download ivy every time we build. If the jar already exists,
> we should skip this.
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