Hi Guys,

        After add 3 hosts to yarn cluster, some job can’t startup, then I found 
some informations as shown below:

        2017-07-17 17:37:29.928 [AMRM Callback Handler Thread] 
YarnClusterResourceManager [INFO] Container allocated from RM on 
rflow79.antfact.com 
        
        2017-07-17 17:37:29.929 [AMRM Callback Handler Thread] 
YarnClusterResourceManager [INFO] Container allocated from RM on 
rflow6.antfact.com 

        2017-07-17 17:37:29.929 [AMRM Callback Handler Thread] 
YarnClusterResourceManager [INFO] Container allocated from RM on 
rflow5.antfact.com 
        
        2017-07-17 17:37:29.929 [AMRM Callback Handler Thread] 
ContainerProcessManager [INFO] Container allocated from RM on 
rflow79.antfact.com 
        
        2017-07-17 17:37:29.929 [AMRM Callback Handler Thread] 
ResourceRequestState [INFO] Host affinity not enabled. Saving the samzaResource 
container_e38_1500040925911_0028_01_000007 in the buffer for ANY_HOST 

        2017-07-17 17:37:29.929 [AMRM Callback Handler Thread] 
ContainerProcessManager [INFO] Container allocated from RM on 
rflow6.antfact.com 

        2017-07-17 17:37:29.929 [AMRM Callback Handler Thread] 
ResourceRequestState [INFO] Host affinity not enabled. Saving the samzaResource 
container_e38_1500040925911_0028_01_000008 in the buffer for ANY_HOST 

        2017-07-17 17:37:29.929 [AMRM Callback Handler Thread] 
ContainerProcessManager [INFO] Container allocated from RM on 
rflow5.antfact.com 

        2017-07-17 17:37:29.929 [AMRM Callback Handler Thread] 
ResourceRequestState [INFO] Host affinity not enabled. Saving the samzaResource 
container_e38_1500040925911_0028_01_000010 in the buffer for ANY_HOST

        What does “Host affinity” mean?

        Thanks!

————————
Qi Shu

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