HADOOP-18880. Add some rpc related metrics to Metrics.md (#6015) Contributed by Yanghai Hu.

Reviewed-by: Inigo Goiri <inigoiri@apache.org>
Signed-off-by: Shilun Fan <slfan1989@apache.org>

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/metrics/RpcMetrics.java

@@ -141,7 +141,7 @@ public class RpcMetrics {
   MutableCounterLong rpcAuthorizationSuccesses;
   @Metric("Number of client backoff requests")
   MutableCounterLong rpcClientBackoff;
-  @Metric("Number of Slow RPC calls")
+  @Metric("Number of slow RPC calls")
   MutableCounterLong rpcSlowCalls;
   @Metric("Number of requeue calls")
   MutableCounterLong rpcRequeueCalls;

hadoop-common-project/hadoop-common/src/site/markdown/Metrics.md

@@ -74,16 +74,21 @@ The default timeunit used for RPC metrics is milliseconds (as per the below desc
 | `SentBytes` | Total number of sent bytes |
 | `RpcQueueTimeNumOps` | Total number of RPC calls |
 | `RpcQueueTimeAvgTime` | Average queue time in milliseconds |
-| `RpcLockWaitTimeNumOps` | Total number of RPC call (same as RpcQueueTimeNumOps) |
+| `RpcLockWaitTimeNumOps` | Total number of RPC calls (same as RpcQueueTimeNumOps) |
 | `RpcLockWaitTimeAvgTime` | Average time waiting for lock acquisition in milliseconds |
 | `RpcProcessingTimeNumOps` | Total number of RPC calls (same to RpcQueueTimeNumOps) |
 | `RpcProcessingAvgTime` | Average Processing time in milliseconds |
+| `DeferredRpcProcessingTimeNumOps` | Total number of Deferred RPC calls |
+| `DeferredRpcProcessingAvgTime` | Average Deferred Processing time in milliseconds |
+| `RpcResponseTimeNumOps` | Total number of RPC calls (same to RpcQueueTimeNumOps) |
+| `RpcResponseAvgTime` | Average Response time in milliseconds |
 | `RpcAuthenticationFailures` | Total number of authentication failures |
 | `RpcAuthenticationSuccesses` | Total number of authentication successes |
 | `RpcAuthorizationFailures` | Total number of authorization failures |
 | `RpcAuthorizationSuccesses` | Total number of authorization successes |
 | `RpcClientBackoff` | Total number of client backoff requests |
 | `RpcSlowCalls` | Total number of slow RPC calls |
+| `RpcRequeueCalls` | Total number of requeue RPC calls |
 | `RpcCallsSuccesses` | Total number of RPC calls that are successfully processed |
 | `NumOpenConnections` | Current number of open connections |
 | `NumInProcessHandler` | Current number of handlers on working |
@@ -107,6 +112,18 @@ The default timeunit used for RPC metrics is milliseconds (as per the below desc
 | `rpcLockWaitTime`*num*`s90thPercentileLatency` | Shows the 90th percentile of RPC lock wait time in milliseconds (*num* seconds granularity) if `rpc.metrics.quantile.enable` is set to true. *num* is specified by `rpc.metrics.percentiles.intervals`. |
 | `rpcLockWaitTime`*num*`s95thPercentileLatency` | Shows the 95th percentile of RPC lock wait time in milliseconds (*num* seconds granularity) if `rpc.metrics.quantile.enable` is set to true. *num* is specified by `rpc.metrics.percentiles.intervals`. |
 | `rpcLockWaitTime`*num*`s99thPercentileLatency` | Shows the 99th percentile of RPC lock wait time in milliseconds (*num* seconds granularity) if `rpc.metrics.quantile.enable` is set to true. *num* is specified by `rpc.metrics.percentiles.intervals`. |
+| `rpcResponseTime`*num*`sNumOps` | Shows total number of RPC calls (*num* seconds granularity) if `rpc.metrics.quantile.enable` is set to true. *num* is specified by `rpc.metrics.percentiles.intervals`. |
+| `rpcResponseTime`*num*`s50thPercentileLatency` | Shows the 50th percentile of RPC response time in milliseconds (*num* seconds granularity) if `rpc.metrics.quantile.enable` is set to true. *num* is specified by `rpc.metrics.percentiles.intervals`. |
+| `rpcResponseTime`*num*`s75thPercentileLatency` | Shows the 75th percentile of RPC response time in milliseconds (*num* seconds granularity) if `rpc.metrics.quantile.enable` is set to true. *num* is specified by `rpc.metrics.percentiles.intervals`. |
+| `rpcResponseTime`*num*`s90thPercentileLatency` | Shows the 90th percentile of RPC response time in milliseconds (*num* seconds granularity) if `rpc.metrics.quantile.enable` is set to true. *num* is specified by `rpc.metrics.percentiles.intervals`. |
+| `rpcResponseTime`*num*`s95thPercentileLatency` | Shows the 95th percentile of RPC response time in milliseconds (*num* seconds granularity) if `rpc.metrics.quantile.enable` is set to true. *num* is specified by `rpc.metrics.percentiles.intervals`. |
+| `rpcResponseTime`*num*`s99thPercentileLatency` | Shows the 99th percentile of RPC response time in milliseconds (*num* seconds granularity) if `rpc.metrics.quantile.enable` is set to true. *num* is specified by `rpc.metrics.percentiles.intervals`. |
+| `deferredRpcProcessingTime`*num*`sNumOps` | Shows total number of Deferred RPC calls (*num* seconds granularity) if `rpc.metrics.quantile.enable` is set to true. *num* is specified by `rpc.metrics.percentiles.intervals`. |
+| `deferredRpcProcessingTime`*num*`s50thPercentileLatency` | Shows the 50th percentile of Deferred RPC processing time in milliseconds (*num* seconds granularity) if `rpc.metrics.quantile.enable` is set to true. *num* is specified by `rpc.metrics.percentiles.intervals`. |
+| `deferredRpcProcessingTime`*num*`s75thPercentileLatency` | Shows the 75th percentile of Deferred RPC processing time in milliseconds (*num* seconds granularity) if `rpc.metrics.quantile.enable` is set to true. *num* is specified by `rpc.metrics.percentiles.intervals`. |
+| `deferredRpcProcessingTime`*num*`s90thPercentileLatency` | Shows the 90th percentile of Deferred RPC processing time in milliseconds (*num* seconds granularity) if `rpc.metrics.quantile.enable` is set to true. *num* is specified by `rpc.metrics.percentiles.intervals`. |
+| `deferredRpcProcessingTime`*num*`s95thPercentileLatency` | Shows the 95th percentile of Deferred RPC processing time in milliseconds (*num* seconds granularity) if `rpc.metrics.quantile.enable` is set to true. *num* is specified by `rpc.metrics.percentiles.intervals`. |
+| `deferredRpcProcessingTime`*num*`s99thPercentileLatency` | Shows the 99th percentile of Deferred RPC processing time in milliseconds (*num* seconds granularity) if `rpc.metrics.quantile.enable` is set to true. *num* is specified by `rpc.metrics.percentiles.intervals`. |
 | `TotalRequests` | Total num of requests served by the RPC server. |
 | `TotalRequestsPerSeconds` | Total num of requests per second served by the RPC server. |