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From "Anton Vinogradov (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (IGNITE-6186) Remove redundant parameter of GridFutureAdapter::unregisterWaiter()
Date Wed, 31 Jan 2018 10:02:00 GMT

     [ https://issues.apache.org/jira/browse/IGNITE-6186?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Anton Vinogradov updated IGNITE-6186:
-------------------------------------
    Fix Version/s: 2.5

> Remove redundant parameter of GridFutureAdapter::unregisterWaiter()
> -------------------------------------------------------------------
>
>                 Key: IGNITE-6186
>                 URL: https://issues.apache.org/jira/browse/IGNITE-6186
>             Project: Ignite
>          Issue Type: Improvement
>    Affects Versions: 2.1
>            Reporter: Andrey Kuznetsov
>            Assignee: Andrey Kuznetsov
>            Priority: Minor
>             Fix For: 2.5
>
>
> The method is not thread-safe unless actual parameter is currentThread.
> Let future state is a list of listeners and two concurrent threads are removing two adjacent
non-root listener nodes from list simultaneously by calling {{unregisterWaiter()}}. Then data
race is possible: one of these listeners can survive its removal. If the listener is a thread
waiting for completion in {{get0()}} then this race leads at worst case to 1 extra call to
{{LockSupport.park()}}, and it's negligible. Otherwise we deal with an arbitrary listener,
and its {{apply()}} will be called twice.
> To be precise, this Jira issue does not relate to any existing bug, but it eliminates
fragile construct that can explode on future chages/refactorings.



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