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https://issues.apache.org/jira/browse/SOLR-5022?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13703245#comment-13703245
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Uwe Schindler edited comment on SOLR-5022 at 7/9/13 1:20 PM:
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Maybe I know, why the permgen issues do not happen for all of us! The reason is:
- Something seems to eat permgen by interning strings! Those interned strings
are never freed until the JVM dies.
- If you run with many CPUs, the test runner runs tests in multiple parallel
JVMs, so every JVMs runs less tests.
...the Jenkins server on MacOSX runs with one JVM only (because the virtual box
has only 2 virtual CPUs). So all tests have to share the permgen. Windows
always passes because no hadoop used. And linux fails more seldom (2 parallel
JVMs). On FreeBSD we also don't run hadoop tests.
We have to find out: Something seems to eat all permgen, not by loading
classes, but by interning strings. And that’s the issue here. My idea would be:
I will run forbidden-apis on all JAR files of Solr that were added and will
forbid {{String#intern()}} signature. This should show us very fast, who
interns strings and we can open bug reports or hot-patch those jar files.
was (Author: thetaphi):
Maybe I know, why the permgen issues do not happen for all of us! The
reason is:
- Something seems to eat permeg by interning strings! Those interned strings
are never freed until the JVM dies.
- If you run with many CPUs, the test runner runs tests in multiple parallel
JVMs, so every JVMs runs less tests.
...the Jenkins server on MacOSX runs with one JVM only (because the virtual box
has only 2 virtual CPUs). So all tests have to share the permgen. Windows
always passes because no hadoop used. And linux fails more seldom (2 parallel
JVMs). On FreeBSD we also don't run hadoop tests.
We have to find out: Something seems to eat all permgen, not by loading
classes, but by interning strings. And that’s the issue here. My idea would be:
I will run forbidden-apis on all JAR files of Solr that were added and will
forbid {{String#intern()}} signature. This should show us very fast, who
interns strings and we can open bug reports or hot-patch those jar files.
> PermGen exhausted test failures on Jenkins.
> -------------------------------------------
>
> Key: SOLR-5022
> URL: https://issues.apache.org/jira/browse/SOLR-5022
> Project: Solr
> Issue Type: Test
> Components: Tests
> Reporter: Mark Miller
> Priority: Blocker
> Fix For: 5.0, 4.4
>
>
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