question: the number of nodes for which there are known pings concode_field_sep DiscoveryNode node concode_elem_sep boolean hasJoinedOnce concode_elem_sep ClusterName clusterName concode_elem_sep Map<DiscoveryNode,PingResponse> pings concode_elem_sep long id concode_elem_sep PingResponse[] EMPTY concode_elem_sep AtomicLong idGenerator concode_elem_sep DiscoveryNode master concode_field_sep void setPingContextProvider concode_elem_sep void readFrom concode_elem_sep void ping concode_elem_sep void onPing concode_elem_sep DiscoveryNode master concode_elem_sep DiscoveryNode node concode_elem_sep void writeTo concode_elem_sep boolean hasJoinedOnce concode_elem_sep ClusterName clusterName concode_elem_sep PingResponse[] toArray concode_elem_sep String toString concode_elem_sep long id concode_elem_sep boolean addPing concode_elem_sep PingResponse readPingResponse concode_elem_sep void addPings
target: int function ( ) { return pings . size ( ) ; }