[GitHub] [couchdb] iilyak commented on issue #2597: Add support for X-Couch-Trace header

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iilyak commented on issue #2597: Add support for X-Couch-Trace header
URL: https://github.com/apache/couchdb/pull/2597#issuecomment-591981275
 
 
   Currently open tracing implementation in CouchDB supports B3 headers (see https://github.com/apache/couchdb/tree/prototype/fdb-layer/src/ctrace#b3-propagation). The B3 headers were invented by zipkin and ended up in some opentracing solutions.
   
   Unfortunately semantics of B3 headers doesn't allow expressing the following:
   * I want to trace this request but I don't have RootSpan please create it for me
   
   I was not aware that there is a concurrent W3C standard. It is probably quite new. Here is what I found on Jaeger page:
   ```
   In the future Jaeger will support the upcoming W3C Trace-Context specification.....
   ```
   
   I briefly looked into W3C standard this morning. It doesn't look like there is a specific header which can be used to enable tracing without specifying root span at the same time. Although I admit my 15 min reading of the spec could miss it.

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