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https://issues.apache.org/jira/browse/HADOOP-9041?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13502624#comment-13502624
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Yanbo Liang commented on HADOOP-9041:
-------------------------------------
As my tracing the process of running test case in maven+junit environment, I
have found that in this environment the ServiceLoader will directly load
service providers from the file
"target/class/META-INF/services/org.apache.hadoop.fs.FileSystem" rather than
load from the jar package. Because much resource would be loaded from this
directory "target/class/", so the classloader will reuse this URL and then
reuse the URL handler for the scheme of "file". ServiceLoader will call
classloader to load resource from the file in this directory, then the loading
will not use the the handler we just register. Due to not use the handler we
just register in FsUrlStreamHandlerFactory, the reusing handler will work well
and not fall into the infinite loop.
So this bug may be difficult to reproduce in junit environment. But in regular
development, it will be dangerous and hidden deep. Until here I think my patch
can resolve this problem and looking forward any comments.
> FileSystem initialization can go into infinite loop
> ---------------------------------------------------
>
> Key: HADOOP-9041
> URL: https://issues.apache.org/jira/browse/HADOOP-9041
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs
> Affects Versions: 2.0.2-alpha
> Reporter: Radim Kolar
> Assignee: Yanbo Liang
> Priority: Critical
> Attachments: fsinit-unit.txt, fstest.groovy, HADOOP-9041.patch,
> HADOOP-9041.patch
>
>
> More information is there: https://jira.springsource.org/browse/SHDP-111
> Referenced source code from example is:
> https://github.com/SpringSource/spring-hadoop/blob/master/src/main/java/org/springframework/data/hadoop/configuration/ConfigurationFactoryBean.java
> from isolating that cause it looks like if you register:
> org.apache.hadoop.fs.FsUrlStreamHandlerFactory before calling
> FileSystem.loadFileSystems() then it goes into infinite loop.
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