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Hadoop QA commented on MAPREDUCE-5583: -------------------------------------- {color:green}+1 overall{color}. Here are the results of testing the latest attachment http://issues.apache.org/jira/secure/attachment/12699734/MAPREDUCE-5583v3.patch against trunk revision d49ae72. {color:green}+1 @author{color}. The patch does not contain any @author tags. {color:green}+1 tests included{color}. The patch appears to include 1 new or modified test files. {color:green}+1 javac{color}. The applied patch does not increase the total number of javac compiler warnings. {color:green}+1 javadoc{color}. There were no new javadoc warning messages. {color:green}+1 eclipse:eclipse{color}. The patch built with eclipse:eclipse. {color:green}+1 findbugs{color}. The patch does not introduce any new Findbugs (version 2.0.3) warnings. {color:green}+1 release audit{color}. The applied patch does not increase the total number of release audit warnings. {color:green}+1 core tests{color}. The patch passed unit tests in hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core. Test results: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/5209//testReport/ Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/5209//console This message is automatically generated. > Ability to limit running map and reduce tasks > --------------------------------------------- > > Key: MAPREDUCE-5583 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-5583 > Project: Hadoop Map/Reduce > Issue Type: Improvement > Components: mr-am, mrv2 > Affects Versions: 0.23.9, 2.1.1-beta > Reporter: Jason Lowe > Assignee: Jason Lowe > Attachments: MAPREDUCE-5583-branch2.4.1.patch, > MAPREDUCE-5583v1.patch, MAPREDUCE-5583v2.patch, MAPREDUCE-5583v3.patch > > > It would be nice if users could specify a limit to the number of map or > reduce tasks that are running simultaneously. Occasionally users are > performing operations in tasks that can lead to DDoS scenarios if too many > tasks run simultaneously (e.g.: accessing a database, web service, etc.). > Having the ability to throttle the number of tasks simultaneously running > would provide users a way to mitigate issues with too many tasks on a large > cluster attempting to access a serivce at any one time. > This is similar to the functionality requested by MAPREDUCE-224 and > implemented by HADOOP-3412 but was dropped in mrv2. -- This message was sent by Atlassian JIRA (v6.3.4#6332)