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https://issues.apache.org/jira/browse/HADOOP-17858?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Takanobu Asanuma updated HADOOP-17858:
--------------------------------------
    Fix Version/s: 3.3.2
                   3.2.3
                   3.4.0
       Resolution: Fixed
           Status: Resolved  (was: Patch Available)

> Avoid possible class loading deadlock with VerifierNone initialization
> ----------------------------------------------------------------------
>
>                 Key: HADOOP-17858
>                 URL: https://issues.apache.org/jira/browse/HADOOP-17858
>             Project: Hadoop Common
>          Issue Type: Bug
>            Reporter: Viraj Jasani
>            Assignee: Viraj Jasani
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 3.4.0, 3.2.3, 3.3.2
>
>          Time Spent: 50m
>  Remaining Estimate: 0h
>
> Superclass Verifier has a static initializer VERIFIER_NONE that initializes 
> sub-class VerifierNone. This reference can result in deadlock during class 
> loading as per 
> [https://docs.oracle.com/javase/specs/jls/se8/html/jls-12.html#jls-12.4.2].
> As of today, only RpcProgram use this instance and hence it is safe but if 
> more clients start using this (specifically static ones), it has potential to 
> bring deadlock. We should break this referencing before it is late.



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