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Posted to common-issues@hadoop.apache.org by "Inigo Goiri (JIRA)" <ji...@apache.org> on 2017/04/26 00:44:04 UTC
[jira] [Commented] (HADOOP-14354) SysInfoWindows is not thread safe
[ https://issues.apache.org/jira/browse/HADOOP-14354?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15983912#comment-15983912 ]
Inigo Goiri commented on HADOOP-14354:
--------------------------------------
In the NodeManager there are two threads that indirectly read values from {{SysInfo}}:
* {{NodeResourceMonitor}}
* {{ContainersMonitor}}
We have seen some cases where values get to weird values once in a while.
The reason is that once in a while two threads try to get a value and both get into {{refreshIfNeeded()}}.
Even if the refresh was thread safe, there is no point on two threads trying to refresh these values at the same time.
> SysInfoWindows is not thread safe
> ---------------------------------
>
> Key: HADOOP-14354
> URL: https://issues.apache.org/jira/browse/HADOOP-14354
> Project: Hadoop Common
> Issue Type: Bug
> Reporter: Inigo Goiri
> Assignee: Inigo Goiri
> Attachments: HADOOP-14354-000.patch
>
>
> Multiple threads can trigger {{refreshIfNeeded()}} in {{SysInfoWindows}} at the same time and cause undesired behaviors.
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