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From "Junping Du (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4576) Extend blacklist mechanism to protect AM failed multiple times on failure nodes
Date Tue, 12 Jan 2016 15:44:40 GMT

    [ https://issues.apache.org/jira/browse/YARN-4576?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15094097#comment-15094097
] 

Junping Du commented on YARN-4576:
----------------------------------

YARN-2005 sounds like related. However, still checking if all cases our facing can be covered
by that JIRA work.

> Extend blacklist mechanism to protect AM failed multiple times on failure nodes
> -------------------------------------------------------------------------------
>
>                 Key: YARN-4576
>                 URL: https://issues.apache.org/jira/browse/YARN-4576
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: resourcemanager
>            Reporter: Junping Du
>            Assignee: Junping Du
>            Priority: Critical
>
> Current YARN blacklist mechanism is to track the bad nodes by AM: If AM tried to launch
containers on a specific node get failed for several times, AM will blacklist this node in
future resource asking. This mechanism works fine for normal containers. However, from our
observation on behaviors of several clusters: if this problematic node launch AM failed, then
RM could pickup this problematic node to launch next AM attempts again and again that cause
application failure in case other functional nodes are busy. In normal case, the customized
healthy checker script cannot be so sensitive to mark node as unhealthy when one or two containers
get launched failed. However, in RM side, we can blacklist these nodes for launching AM for
a certain time if launching AMs get failed before.



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