[JIRA] (JENKINS-16215) Avoid unnecessary downloads in FilePath.installIfNecessaryFrom

[l...@hulte.net (JIRA)]

Lars Hvile created JENKINS-16215 Avoid unnecessary downloads in FilePath.installIfNecessaryFrom Issue Type: Improvement Affects Versions: current Assignee: Unassigned Components: core Created: 28/Dec/12 11:18 AM Description: FilePath.installIfNecessaryFrom is used by the DownloadFromUrlInstaller when installing things like the JDK. The current implementation issues a regular GET request just to access the 'last modified' header. This also seems to be triggered per executor resulting in lots of stress on the server hosting the JDK zip/tar.gz. installIfNecessaryFrom could be changed to read the cached timestamp first, and issue that in the 'If-Modified-Since' header. http://docs.oracle.com/javase/6/docs/api/java/net/URLConnection.html#setIfModifiedSince%28long%29 Project: Jenkins Priority: Major Reporter: Lars Hvile

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