Use sal-netconf-connector to connet device costs too much time

When we uses sal-netconf-connector(Lithium sr4) to connet our router device(contains 200+ yang capabilities),it costs hours to be connected. The conntroller does not support the most yang capabilities of the device, but it is blocked in

at com.google.common.util.concurrent.Futures$6.run(Futures.java:1310)
at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:457)
at com.google.common.util.concurrent.ExecutionList.executeListener(ExecutionList.java:156)
at com.google.common.util.concurrent.ExecutionList.add(ExecutionList.java:101)
at com.google.common.util.concurrent.AbstractFuture.addListener(AbstractFuture.java:170)
at com.google.common.util.concurrent.ForwardingListenableFuture.addListener(ForwardingListenableFuture.java:47)
at com.google.common.util.concurrent.Futures.addCallback(Futures.java:1322)
at com.google.common.util.concurrent.Futures.addCallback(Futures.java:1258)
at org.opendaylight.controller.sal.connect.netconf.NetconfDevice$RecursiveSchemaSetup.setUpSchema(NetconfDevice.java:460)
at org.opendaylight.controller.sal.connect.netconf.NetconfDevice$RecursiveSchemaSetup.access$1400(NetconfDevice.java:390)
at org.opendaylight.controller.sal.connect.netconf.NetconfDevice$RecursiveSchemaSetup$1.onFailure(NetconfDevice.java:443)

it costs too many hours untill it connected at last with many source miss yang capabilities.