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  1. Jenkins
  2. JENKINS-23244

Slave build history page has no data and spawns a ton of very long-lived blocking threads on the master

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      Description

      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.

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            lkarnasiewicz Lukasz Karnasiewicz added a comment -

            Steps to reproduce:
            1. Display slave builds history page. Wait for it to render, there should be a small progress bar with "Computation in progress" hint
            2. Request any other page (e.g. the main page) - it will hang

            Sample thread dump illustrating the problem attached.
            Thread 30745 is processing request for slave builds history (http://jenkins/computer/slave_name/builds)
            All other requests now hang on jenkins.model.lazy.AbstractLazyLoadRunMap.load for up to 2 minutes in our case.

            Show
            lkarnasiewicz Lukasz Karnasiewicz added a comment - Steps to reproduce: 1. Display slave builds history page. Wait for it to render, there should be a small progress bar with "Computation in progress" hint 2. Request any other page (e.g. the main page) - it will hang Sample thread dump illustrating the problem attached. Thread 30745 is processing request for slave builds history ( http://jenkins/computer/slave_name/builds ) All other requests now hang on jenkins.model.lazy.AbstractLazyLoadRunMap.load for up to 2 minutes in our case.
            Hide
            mmitche Matthew Mitchell added a comment -

            I'm seeing this in our installation. It severely impacts the repsonsiveness of the system.

            Show
            mmitche Matthew Mitchell added a comment - I'm seeing this in our installation. It severely impacts the repsonsiveness of the system.
            Hide
            mmitche Matthew Mitchell added a comment -

            (FYI this installation is around 6-7k builds a day)

            Even in the case of walking newer builds, it seems like this woudl be super expensive. Maybe it's better to keep an index of buildname/number to machine to avoid loading the metadata at all?

            Show
            mmitche Matthew Mitchell added a comment - (FYI this installation is around 6-7k builds a day) Even in the case of walking newer builds, it seems like this woudl be super expensive. Maybe it's better to keep an index of buildname/number to machine to avoid loading the metadata at all?
            Hide
            scm_issue_link SCM/JIRA link daemon added a comment -

            Code changed in jenkins
            User: Akbashev Alexander
            Path:
            core/src/main/resources/hudson/model/BuildTimelineWidget/control.jelly
            http://jenkins-ci.org/commit/jenkins/2a0ac4f0989407a20e277444a7737e9c5f7ea78a
            Log:
            [FIX JENKINS-23244] Slave build history page has no data and spawns a ton of very long-lived blocking threads on the master (#2584)

            Mainly commit are doing two things:
            1) Show only selected (visible) builds
            2) Query build one-by-one - not it parallel

            Show
            scm_issue_link SCM/JIRA link daemon added a comment - Code changed in jenkins User: Akbashev Alexander Path: core/src/main/resources/hudson/model/BuildTimelineWidget/control.jelly http://jenkins-ci.org/commit/jenkins/2a0ac4f0989407a20e277444a7737e9c5f7ea78a Log: [FIX JENKINS-23244] Slave build history page has no data and spawns a ton of very long-lived blocking threads on the master (#2584) Mainly commit are doing two things: 1) Show only selected (visible) builds 2) Query build one-by-one - not it parallel
            Hide
            scm_issue_link SCM/JIRA link daemon added a comment -

            Code changed in jenkins
            User: Akbashev Alexander
            Path:
            core/src/main/resources/hudson/model/BuildTimelineWidget/control.jelly
            http://jenkins-ci.org/commit/jenkins/4421d1b94d143956475f20a03c63fb1a367321f2
            Log:
            [FIX JENKINS-23244] Slave build history page has no data and spawns a ton of very long-lived blocking threads on the master (#2584)

            Mainly commit are doing two things:
            1) Show only selected (visible) builds
            2) Query build one-by-one - not it parallel
            (cherry picked from commit 2a0ac4f0989407a20e277444a7737e9c5f7ea78a)

            Show
            scm_issue_link SCM/JIRA link daemon added a comment - Code changed in jenkins User: Akbashev Alexander Path: core/src/main/resources/hudson/model/BuildTimelineWidget/control.jelly http://jenkins-ci.org/commit/jenkins/4421d1b94d143956475f20a03c63fb1a367321f2 Log: [FIX JENKINS-23244] Slave build history page has no data and spawns a ton of very long-lived blocking threads on the master (#2584) Mainly commit are doing two things: 1) Show only selected (visible) builds 2) Query build one-by-one - not it parallel (cherry picked from commit 2a0ac4f0989407a20e277444a7737e9c5f7ea78a)

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              • Assignee:
                jimilian Alexander A
                Reporter:
                abayer Andrew Bayer
              • Votes:
                8 Vote for this issue
                Watchers:
                19 Start watching this issue

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                • Created:
                  Updated:
                  Resolved: