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Posted to common-issues@hadoop.apache.org by "Colin Patrick McCabe (JIRA)" <ji...@apache.org> on 2013/07/03 18:02:23 UTC
[jira] [Commented] (HADOOP-9618) Add thread which detects JVM
pauses
[ https://issues.apache.org/jira/browse/HADOOP-9618?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13699112#comment-13699112 ]
Colin Patrick McCabe commented on HADOOP-9618:
----------------------------------------------
This kind of info will be really useful in debugging.
+1.
If there are no more comments, I'll commit in a day or two.
> Add thread which detects JVM pauses
> -----------------------------------
>
> Key: HADOOP-9618
> URL: https://issues.apache.org/jira/browse/HADOOP-9618
> Project: Hadoop Common
> Issue Type: New Feature
> Components: util
> Affects Versions: 3.0.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Attachments: hadoop-9618.txt
>
>
> Often times users struggle to understand what happened when a long JVM pause (GC or otherwise) causes things to malfunction inside a Hadoop daemon. For example, a long GC pause while logging an edit to the QJM may cause the edit to timeout, or a long GC pause may make other IPCs to the NameNode timeout. We should add a simple thread which loops on 1-second sleeps, and if the sleep ever takes significantly longer than 1 second, log a WARN. This will make GC pauses obvious in logs.
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