Issue

When accessing graphs on a Build History Trend page cause Jenkins to become unresponsive

This is being manifested on:
* At Browser, it can been seen at HTTP 503 Service unavailable.
* Jenkins is unresponsive but still running and cannot login via browser.
* At Thread Dumps, it can been seen Requests containing /timeline/data/ as BLOCKED. For instance something similar to:

"Handling POST /view/Builds/timeline/data/ from example.com : ajp-bio-127.0.0.1-9009-exec-57" Id=7549 BLOCKED on hudson.model.RunMap@197b81f7 owned by "Handling POST /view/Builds/timeline/data/ from example.com : ajp-bio-127.0.0.1-9009-exec-28" Id=203
	at jenkins.model.lazy.AbstractLazyLoadRunMap.getByNumber(AbstractLazyLoadRunMap.java:356)
	-  blocked on hudson.model.RunMap@197b81f7
	at jenkins.model.lazy.AbstractLazyLoadRunMap.search(AbstractLazyLoadRunMap.java:332)
	at jenkins.model.lazy.AbstractLazyLoadRunMap.newestBuild(AbstractLazyLoadRunMap.java:274)
	at jenkins.model.lazy.LazyLoadRunMapEntrySet$1.<init>(LazyLoadRunMapEntrySet.java:65)
	at jenkins.model.lazy.LazyLoadRunMapEntrySet.iterator(LazyLoadRunMapEntrySet.java:63)
	at java.util.AbstractMap$2$1.<init>(AbstractMap.java:389)
	at java.util.AbstractMap$2.iterator(AbstractMap.java:388)
	at hudson.util.RunList.iterator(RunList.java:97)
	...

Environment

• CloudBees Jenkins Enterprise (CJE)
• CloudBees Request Filter plugin

Resolution

Install the CloudBees Request Filter plugin >= 1.1 and block .*/computer/.*/timeline/data/ requests.

Please have a look at How Do I Use The CloudBees Request Filter Plugin.