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yarn fair-scheduler problem

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yarn fair-scheduler problem

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hi
In my CDH5.4 cluster,  I configured YARN with fair-scheduler to manage resource, but sometimes  users submit yarn applications(mr/spark/hive...) to cluster, the apps is in pendings state with a long time , although the user's queue is configured "minResources"  and  "num active applications" is not reached "maxRunningApps",
also the cluster has a lot of mem/vores , but the scheduler don't  assign container to  those pending apps,after 10-20 minutes, It will be OK

please tell me how to resolve this problem