[ https://issues.apache.org/jira/browse/MAPREDUCE-257?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12730539#action_12730539 ]
Milind Bhandarkar commented on MAPREDUCE-257: --------------------------------------------- I have seen this in one of our production clusters. The java task itself is killed due to memory limits, but there is a runaway task consuming lost of memory. So, I think killing the entire process tree did not work. > Preventing node from swapping > ----------------------------- > > Key: MAPREDUCE-257 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-257 > Project: Hadoop Map/Reduce > Issue Type: Improvement > Reporter: Hong Tang > > When a node swaps, it slows everything: maps running on that node, reducers > fetching output from the node, and DFS clients reading from the DN. We should > just treat it the same way as if OS exhausts memory and kill some tasks to > free up memory. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.