So I went to try to see the usage for a slave on builds.apache.org, and the page had no builds on it. I eventually noticed the "Calculation in progress" bit and thought "Oh, ok, I'll leave this up and check again later". That was a mistake. Now there are 30+ threads on the master like the ones in https://gist.github.com/abayer/88e390e3f0859f8b64e2 - i.e., a whole ton of HTTP POST requests to /computer/foo/timeline/data, all but one blocking on the one that's running, and the one that's running takes a long time to finish.
This means (a) that the build history page for a slave is useless and (b) that we're churning CPU/IO and, I'm guessing, doing so repeatedly without caching, since when I check it now, even an hour and a half later, there's no data on the page.
Originally reported by 
abayer, imported from: Slave build history page has no data and spawns a ton of very long-lived blocking threads on the master
- assignee:
jimilian
- status: Resolved
- priority: Major
- component(s): core
- label(s): 2.19.4-fixed, lazy-loading, performance
- resolution: Fixed
- resolved: 2016-10-17T15:18:59+00:00
- votes: 8
- watchers: 18
- imported: 2025-11-24
Raw content of original issue
So I went to try to see the usage for a slave on builds.apache.org, and the page had no builds on it. I eventually noticed the "Calculation in progress" bit and thought "Oh, ok, I'll leave this up and check again later". That was a mistake. Now there are 30+ threads on the master like the ones in https://gist.github.com/abayer/88e390e3f0859f8b64e2 - i.e., a whole ton of HTTP POST requests to /computer/foo/timeline/data, all but one blocking on the one that's running, and the one that's running takes a long time to finish.
This means (a) that the build history page for a slave is useless and (b) that we're churning CPU/IO and, I'm guessing, doing so repeatedly without caching, since when I check it now, even an hour and a half later, there's no data on the page.
1 attachment
So I went to try to see the usage for a slave on builds.apache.org, and the page had no builds on it. I eventually noticed the "Calculation in progress" bit and thought "Oh, ok, I'll leave this up and check again later". That was a mistake. Now there are 30+ threads on the master like the ones in https://gist.github.com/abayer/88e390e3f0859f8b64e2 - i.e., a whole ton of HTTP POST requests to /computer/foo/timeline/data, all but one blocking on the one that's running, and the one that's running takes a long time to finish.
This means (a) that the build history page for a slave is useless and (b) that we're churning CPU/IO and, I'm guessing, doing so repeatedly without caching, since when I check it now, even an hour and a half later, there's no data on the page.
Originally reported by
abayer, imported from: Slave build history page has no data and spawns a ton of very long-lived blocking threads on the master
Raw content of original issue
1.554.1 withJENKINS-22822backported onto it1 attachment