issue about rpc activity metrics

[ch huang]

hi,all:
        i get rpc metrics from NN 50070 port ,and i try search the code to
see how these metrics is caculated,
i try to use grep,but get nothing ,why?
[root@CH124 hadoop-2.0.0-cdh4.3.0]# grep -R 'DeleteNumOps' *
 {
    "name" : "Hadoop:service=NameNode,name=RpcDetailedActivityForPort8020",
    "modelerType" : "RpcDetailedActivityForPort8020",
    "tag.port" : "8020",
    "tag.Context" : "rpcdetailed",
    "tag.Hostname" : "CHBM220",
    "SendHeartbeatNumOps" : 106434,
    "SendHeartbeatAvgTime" : 0.05366726296958853,
    "VersionRequestNumOps" : 9,
    "VersionRequestAvgTime" : 0.7777777777777777,
    "RegisterDatanodeNumOps" : 9,
    "RegisterDatanodeAvgTime" : 2.2222222222222223,
    "BlockReportNumOps" : 24,
    "BlockReportAvgTime" : 3.0,
    "GetServiceStatusNumOps" : 63811,
    "GetServiceStatusAvgTime" : 0.05970149253731349,
    "MonitorHealthNumOps" : 63811,
    "MonitorHealthAvgTime" : 0.0686567164179105,
    "TransitionToStandbyNumOps" : 3,
    "TransitionToStandbyAvgTime" : 27.333333333333336,
    "TransitionToActiveNumOps" : 1,
    "TransitionToActiveAvgTime" : 8026.0,
    "RollEditLogNumOps" : 210,
    "RollEditLogAvgTime" : 306.7428571428572,
    "GetListingNumOps" : 516,
    "GetListingAvgTime" : 0.18798449612403115,
    "GetFileInfoNumOps" : 507,
    "GetFileInfoAvgTime" : 0.12228796844181453,
    "CreateNumOps" : 4,
    "CreateAvgTime" : 53.5,
    "CompleteNumOps" : 4,
    "CompleteAvgTime" : 45.0,
    "SetOwnerNumOps" : 4,
    "SetOwnerAvgTime" : 43.0,
    "DeleteNumOps" : 4,
    "DeleteAvgTime" : 44.75
  }