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Sharad Agarwal commented on MAPREDUCE-3274: ------------------------------------------- >> JVM with ID: jvm_1319242394842_0065_r_000008 given task: >> attempt_1319242394842_0065_r_000004_0 there seems something wrong here. jvm with particular id should always be given the corresponding task. > Race condition in MR App Master Preemtion can cause a dead lock > --------------------------------------------------------------- > > Key: MAPREDUCE-3274 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-3274 > Project: Hadoop Map/Reduce > Issue Type: Bug > Components: mrv2, scheduler > Affects Versions: 0.23.0, 0.24.0 > Reporter: Robert Joseph Evans > Assignee: Robert Joseph Evans > Priority: Critical > Fix For: 0.23.0, 0.24.0 > > > There appears to be a race condition in the MR App Master in relation to > preempting reducers to let a mapper run. In the particular case that I have > been debugging a reducer was selected for preemption that did not have a > container assigned to it yet. When the container became available that reduce > started running and the previous TA_KILL event appears to have been ignored. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira