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From Rohith Sharma K S <rohithsharm...@huawei.com>
Subject RE: When does the RM ever send out node map updates?
Date Mon, 19 Oct 2015 05:25:52 GMT
NM node updates are sent to ApplicationMaster only when NodeManager is added/removed/'change
in NM state i.e Usable/Unusable'. Otherwise no updates are sent to AM  even at least one time
in application life time!!

I believe it is implemented purposefully to intimate AM about only unusable nodes. 

Thanks & Regards
Rohith Sharma K S

-----Original Message-----
From: Steve Loughran [mailto:stevel@hortonworks.com] 
Sent: 18 October 2015 23:48
To: yarn-dev@hadoop.apache.org
Subject: When does the RM ever send out node map updates?

I've been modifying the slider AM to wait for NM updates of node maps -but I'm not seeing
any onNodesUpdated() callbacks, at least for an AM which doesn't instantiate any containers.

When/how do those updates come?

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