Formerly, `Span.getAccumulatedMillis()` worked, but could returns
imprecise measurements, particularly local spans. This changes the
internals of Span to keep track of a start tick. Using this, it can
return a more precise `Span.getAccumulatedMicros()`.
To ensure this precision isn't lost in serialization, this adds a
json field `durationMicros`, which is only set when the span is stopped.
This is set instead of start tick because `System.nanoTime()` is JVM
specific and so cannot be used across the network. `durationMicros` uses
null instead of zero comparisons because nano time can be negative.
Fixes#312
Fixed integration tests to use ZipkinRule
Introduce assertj assertions (#315)
* Introduce assertJ assertions in some tests
* Fix code formatting to be inline with Spring rules
Removes wiremock as a test dependency in core (which created more
issues than you might expect because Tomcat and Jetty don't treay
HTTP headers in the same way apparently).
Also moves the spring-messaging dependency to where it is needed
in sleuth stream.
Notably, this removes the "zipkin-web" dependency, as the UI is now
collocated on zipkin-server.
Other notable changes are Cassandra and Kafka support, as well removing
the Brave dependency.
This is a maintenance update to zipkin which has no api impact.
* zipkin-server supports cassandra now
* zipkin-web is now javascript (even if still hosted on a scala process)
This updates to latest zipkin, adding a flag to gzip spans before
posting them. Note this is set to false by default as it requires servers
to also be latest. We can flip the default once we can assume that.
Ex. `spring.zipkin.compression.enabled = true`
This includes updates to the latest zipkin-web image and zipkin-java
dependency.
zipkin-web's notable as it does a lot more in javascript, ex it no
longer does server-side mustache template rendering. It also makes one
less call to the services endpoint when rendering the search page.
zipkin-java's in-memory span store is now in the core jar and also can
render the dependency tree. This means it is now feature-parity with
mysql (but still merely a test span-store). zipkin-java also now tests
that it can run without optional dependencies.
This includes better dependency aggregation than before. For example,
you no longer need mysql to view the dependency graph, as the in-memory
server supports aggregation now. Also, if you log "ca" on a root span,
the associated service will show on the dependency graph on the far
left. This allows you to show uninstrumented clients of note. Similarly,
if you log "sa" on a leaf node, the destination will show on the far
right. You'd use "sa" for uninstrumented services like databases, auth
servers or cloud apis.
Note: 0.5.2 uses spring boot 1.3.2
Also allows us to actually create a PercentageBasedSampler (I
don't think anyone tried it before) without resorting to
lazy beans and proxies.
Another freature added here is a default percentage sampler
if we know that spans need to be exported (zipkin or stream
is present).
Fixes gh-138
