smengcl commented on a change in pull request #1846: HADOOP-15566. Support 
Opentracing
URL: https://github.com/apache/hadoop/pull/1846#discussion_r381016157
 
 

 ##########
 File path: hadoop-common-project/hadoop-common/src/main/proto/RpcHeader.proto
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 @@ -91,6 +91,7 @@ message RpcRequestHeaderProto { // the header for the 
RpcRequest
   optional RPCTraceInfoProto traceInfo = 6; // tracing info
   optional RPCCallerContextProto callerContext = 7; // call context
   optional int64 stateId = 8; // The last seen Global State ID
+  optional bytes spanContext = 9; // OpenTracing SpanContext
 
 Review comment:
   Moved to `RPCTraceInfoProto`.

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