62cad0f5f5
RPC messaging service is initialized before the Tracing service, so
we should prevent creation of tracing spans before the service is
fully initialized.
We will use an already existing "_down" state and extend it in a way
that !_down equals "started", where "started" is TRUE when the local
service is fully initialized.
We will also split the Tracing service initialization into two parts:
1) Initialize the sharded object.
2) Start the tracing service:
- Create the I/O backend service.
- Enable tracing.
Fixes issue #1939
Signed-off-by: Vlad Zolotarov <vladz@scylladb.com>
Message-Id: <1481836429-28478-1-git-send-email-vladz@scylladb.com>