Details
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Bug
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Resolution: Fixed
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Major
Description
Installing a large downloaded tool on a network slave can be quite slow:
"Executor #... for ... : executing ... #... / waiting for hudson.remoting.Channel@...:HTTP full-duplex channel ..." Id=... Group=main TIMED_WAITING on hudson.remoting.UserRequest@... at java.lang.Object.wait(Native Method) - waiting on hudson.remoting.UserRequest@... at hudson.remoting.Request.call(Request.java:146) at hudson.remoting.Channel.call(Channel.java:672) at hudson.FilePath.act(FilePath.java:831) at hudson.FilePath.act(FilePath.java:824) at hudson.FilePath.unzipFrom(FilePath.java:485) at hudson.FilePath.installIfNecessaryFrom(FilePath.java:718) at hudson.tools.DownloadFromUrlInstaller.performInstallation(DownloadFromUrlInstaller.java:72) at com.soasta.jenkins.MakeAppTouchTestableInstaller.performInstallation(MakeAppTouchTestableInstaller.java:49) at com.soasta.jenkins.MakeAppTouchTestable.perform(MakeAppTouchTestable.java:94) at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:19) at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:728) at hudson.model.Build$BuildExecution.build(Build.java:199) at hudson.model.Build$BuildExecution.doRun(Build.java:160) at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:510) at hudson.model.Run.execute(Run.java:1505) at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46) at hudson.model.ResourceController.execute(ResourceController.java:88) at hudson.model.Executor.run(Executor.java:237)
JENKINS-7813 is partly to blame, but the main issue here is that the URL is being opened on master, a RemoteInputStream constructed, and the archive unpacked on the slave. It would be much faster to open the URL directly from the slave and use the remoting channel only for control.
In typical cases the slave can access a tool URL. There are some rarer cases where it is really intentional that the URL is resolved from the master; it might be a file-protocol URL, the slave might have no public internet access, the download location might be limited to particular IPs, etc. So installIfNecessaryFrom should first try to open from the slave, then fall back to the current implementation.
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