[ https://issues.apache.org/jira/browse/MAPREDUCE-2489?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jeffrey Naisbitt updated MAPREDUCE-2489: ---------------------------------------- Attachment: MAPREDUCE-2489-0.20s-v2.patch Updated patch for the 0.20-security branch > Jobsplits with random hostnames can make the queue unusable > ----------------------------------------------------------- > > Key: MAPREDUCE-2489 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-2489 > Project: Hadoop Map/Reduce > Issue Type: Bug > Components: jobtracker > Affects Versions: 0.20.205.0, 0.23.0 > Reporter: Jeffrey Naisbitt > Assignee: Jeffrey Naisbitt > Attachments: MAPREDUCE-2489-0.20s-v2.patch, > MAPREDUCE-2489-0.20s.patch, MAPREDUCE-2489-mapred-v2.patch, > MAPREDUCE-2489-mapred.patch > > > We saw an issue where a custom InputSplit was returning invalid hostnames for > the splits that were then causing the JobTracker to attempt to excessively > resolve host names. This caused a major slowdown for the JobTracker. We > should prevent invalid InputSplit hostnames from affecting everyone else. > I propose we implement some verification for the hostnames to try to ensure > that we only do DNS lookups on valid hostnames (and fail otherwise). We > could also fail the job after a certain number of failures in the resolve. -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira