Code changed in jenkins
User: Vincent Latombe
Path:
core/src/main/java/jenkins/model/PeepholePermalink.java
http://jenkins-ci.org/commit/jenkins/f768fb7aed02bf4e944eff10cb2ba3007d98e560
Log:
JENKINS-20534 Avoid usage of temporary file to write symlink.

Creating a symlink is an atomic operation, and additionally
usage of tmp file + rename performs very badly on NTFS file
system because of the way the rename is tracked in the $MFT.

In case symbolic links are not supported, we still fallback to
a regular file.

(cherry picked from commit c0742b8bff9fe407e568da7ed860f30d9ea8aedc)

Integrated in jenkins_main_trunk #3192
JENKINS-20534 Avoid usage of temporary file to write symlink. (Revision c0742b8bff9fe407e568da7ed860f30d9ea8aedc)
[FIXED JENKINS-20534] Noting merge of #1057. (Revision 5c83c64e7af95bc5f216d841e4257c79403931d8)

Result = SUCCESS
Vincent Latombe : c0742b8bff9fe407e568da7ed860f30d9ea8aedc
Files :

• core/src/main/java/jenkins/model/PeepholePermalink.java

Jesse Glick : 5c83c64e7af95bc5f216d841e4257c79403931d8
Files :

• changelog.html

Marked the issue as lts-candidate

Code changed in jenkins
User: Jesse Glick
Path:
changelog.html
http://jenkins-ci.org/commit/jenkins/5c83c64e7af95bc5f216d841e4257c79403931d8
Log:
[FIXED JENKINS-20534] Noting merge of #1057.

Compare: https://github.com/jenkinsci/jenkins/compare/da8eba20babf...5c83c64e7af9

Code changed in jenkins
User: Vincent Latombe
Path:
core/src/main/java/jenkins/model/PeepholePermalink.java
http://jenkins-ci.org/commit/jenkins/c0742b8bff9fe407e568da7ed860f30d9ea8aedc
Log:
JENKINS-20534 Avoid usage of temporary file to write symlink.

Creating a symlink is an atomic operation, and additionally
usage of tmp file + rename performs very badly on NTFS file
system because of the way the rename is tracked in the $MFT.

In case symbolic links are not supported, we still fallback to
a regular file.

PR to avoid renaming of symlinks
https://github.com/jenkinsci/jenkins/pull/1057

A significant number of threads seem to take time during rename of the cache file. Corresponding disk queues don't seem stressed at all, it only has a CPU impact.

java.lang.Thread.State: RUNNABLE
	at java.io.WinNTFileSystem.rename0(Native Method)
	at java.io.Win32FileSystem.rename(Win32FileSystem.java:535)
	at java.io.File.renameTo(File.java:1391)
	at jenkins.model.PeepholePermalink.writeSymlink(PeepholePermalink.java:185)
	at jenkins.model.PeepholePermalink.updateCache(PeepholePermalink.java:142)
	at jenkins.model.PeepholePermalink$RunListenerImpl.onCompleted(PeepholePermalink.java:219)
	at hudson.model.listeners.RunListener.fireCompleted(RunListener.java:199)
	at hudson.maven.MavenBuild$ProxyImpl2.end(MavenBuild.java:574)