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Posted to common-dev@hadoop.apache.org by "Hong Tang (JIRA)" <ji...@apache.org> on 2009/05/13 10:56:45 UTC

[jira] Commented: (HADOOP-5817) Preventing node from swapping

    [ https://issues.apache.org/jira/browse/HADOOP-5817?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12708833#action_12708833 ] 

Hong Tang commented on HADOOP-5817:
-----------------------------------

Normally, this condition does not happen often. However, we have seen it happens due to various reasons: mis-configured heap size (HADOOP-5725) or processes running on that node not under control by MapReduce.

> Preventing node from swapping
> -----------------------------
>
>                 Key: HADOOP-5817
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5817
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: mapred
>            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.

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