hadoop-common-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3925) Configuration paramater to set the maximum number of mappers/reducers for a job
Date Fri, 08 Aug 2008 07:54:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3925?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12620870#action_12620870
] 

Devaraj Das commented on HADOOP-3925:
-------------------------------------

Dhruba, what are the symptoms of the DOS? Does the JT lockup & stop responding to the
heartbeats/client-RPCs? Or, are you worried that a single large job would starve others?

> Configuration paramater to set the maximum number of mappers/reducers for a job
> -------------------------------------------------------------------------------
>
>                 Key: HADOOP-3925
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3925
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: mapred
>            Reporter: dhruba borthakur
>
> The JobTracker can be prone to a denial-of-service attack if a user submits a job that
has a very large number of tasks. This has happened once in our cluster. It would be nice
to have a configuration setting that limits the maximum tasks that a single job can have.


-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


Mime
View raw message