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<meta itemprop="headline" content="Howto Upgrade to Zipkin2">
<meta itemprop="description" content="Changes between v1 and v2 of zipkin and how Java Chassis upgraded to zipkin2">
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<meta itemprop="dateModified" content="January 11, 2018">
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<h1 class="page__title" itemprop="headline">Howto Upgrade to Zipkin2
</h1>
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3 minute read
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<section class="page__content" itemprop="text">
<h2 id="background">Background</h2>
<p>Java Chassis uses zipkin as the default tracing implementation.</p>
<p>Zipkin introduced <a href="http://zipkin.io/zipkin-api/#/">v2 http api</a> in version 1.31 which simplifies data types. There are also various other improvements and new features added to the zipkin libraries, so it seems a good time for us to follow the upstream and upgrade to zipkin2.</p>
<h3 id="version-matrix">Version matrix</h3>
<table>
<thead>
<tr>
<th>module</th>
<th>current</th>
<th>target</th>
<th>supports v2 since</th>
</tr>
</thead>
<tbody>
<tr>
<td>zipkin</td>
<td>1.24.0</td>
<td>2.4.2</td>
<td>2.0.0</td>
</tr>
<tr>
<td>brave</td>
<td>4.13.1</td>
<td>4.13.1</td>
<td>4.7.1</td>
</tr>
<tr>
<td>reporter</td>
<td>0.10.0</td>
<td>2.2.2</td>
<td>2.0.0</td>
</tr>
</tbody>
</table>
<h2 id="whats-changed">What’s changed</h2>
<p>Zipkin did a very good job on maintaining backward compatibility. All the changes that breaks compatiblity are packaged into a new group(<code class="highlighter-rouge">io.zipkin.java</code> -&gt; <code class="highlighter-rouge">io.zipkin.zipkin2</code>, <code class="highlighter-rouge">io.zipkin.reporter</code> -&gt; <code class="highlighter-rouge">io.zipkin.reporter2</code>). And v1/v2 libraries can coexist.</p>
<p>The zipkin2 library can use both v1 and v2 api to communicate with server.</p>
<p>The <code class="highlighter-rouge">zipkin2.Span</code> class changed a bit from the old <code class="highlighter-rouge">zipkin.Span</code> class. The public fields are refactored to methods. And the <code class="highlighter-rouge">BinaryAnnotation</code> class is removed along with <code class="highlighter-rouge">zipkin.Span.binaryAnnotaions</code> field. It’s functionality is replaced by <code class="highlighter-rouge">zipkin2.Span.tags()</code> method which return a <code class="highlighter-rouge">Map&lt;String,String&gt;</code>.</p>
<h2 id="upgrade-to-zipkin2-for-java-chassis">Upgrade to zipkin2 for Java Chassis</h2>
<h3 id="modify-the-maven-dependencies-to-use-the-target-version-of-related-libraries">Modify the maven dependencies to use the target version of related libraries.</h3>
<p>Change the group <code class="highlighter-rouge">io.zipkin.java</code> and <code class="highlighter-rouge">io.zipkin.reporter</code> to <code class="highlighter-rouge">io.zipkin.zipkin2</code> and <code class="highlighter-rouge">io.zipkin.reporter2</code> respectively.</p>
<div class="language-diff highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="p">java-chassis-dependencies/pom.xml
@@ -50,8 +50,8 @@</span>
&lt;cxf.version&gt;3.1.6&lt;/cxf.version&gt;
&lt;logback.version&gt;1.1.7&lt;/logback.version&gt;
&lt;brave.version&gt;4.13.1&lt;/brave.version&gt;
<span class="gd">- &lt;zipkin.version&gt;1.24.0&lt;/zipkin.version&gt;
- &lt;zipkin-reporter.version&gt;0.10.0&lt;/zipkin-reporter.version&gt;
</span><span class="gi">+ &lt;zipkin.version&gt;2.4.2&lt;/zipkin.version&gt;
+ &lt;zipkin-reporter.version&gt;2.2.2&lt;/zipkin-reporter.version&gt;
</span> &lt;/properties&gt;
&lt;dependencyManagement&gt;
<span class="p">@@ -646,7 +646,7 @@</span>
&lt;!-- zipkin dependencies --&gt;
&lt;dependency&gt;
<span class="gd">- &lt;groupId&gt;io.zipkin.java&lt;/groupId&gt;
</span><span class="gi">+ &lt;groupId&gt;io.zipkin.zipkin2&lt;/groupId&gt;
</span> &lt;artifactId&gt;zipkin&lt;/artifactId&gt;
&lt;version&gt;${zipkin.version}&lt;/version&gt;
&lt;/dependency&gt;
<span class="p">@@ -661,7 +661,7 @@</span>
&lt;version&gt;${brave.version}&lt;/version&gt;
&lt;/dependency&gt;
&lt;dependency&gt;
<span class="gd">- &lt;groupId&gt;io.zipkin.reporter&lt;/groupId&gt;
</span><span class="gi">+ &lt;groupId&gt;io.zipkin.reporter2&lt;/groupId&gt;
</span> &lt;artifactId&gt;zipkin-sender-okhttp3&lt;/artifactId&gt;
&lt;version&gt;${zipkin-reporter.version}&lt;/version&gt;
&lt;/dependency&gt;
handlers/handler-tracing-zipkin/pom.xml
<span class="p">@@ -50,7 +50,7 @@</span>
&lt;artifactId&gt;brave&lt;/artifactId&gt;
&lt;/dependency&gt;
&lt;dependency&gt;
<span class="gd">- &lt;groupId&gt;io.zipkin.reporter&lt;/groupId&gt;
</span><span class="gi">+ &lt;groupId&gt;io.zipkin.reporter2&lt;/groupId&gt;
</span> &lt;artifactId&gt;zipkin-sender-okhttp3&lt;/artifactId&gt;
&lt;/dependency&gt;
&lt;dependency&gt;
</code></pre></div></div>
<h3 id="make-brave-to-use-zipkin2-instead-of-zipkin">Make brave to use zipkin2 instead of zipkin</h3>
<p>Change the zipkin.xxx import to zipkin2.xxx on imports, and most importantly, use <code class="highlighter-rouge">spanReporter()</code> instead of <code class="highlighter-rouge">reporter()</code> for generating reporter for brave, change the api path to /api/v2/xxx when creating sender.</p>
<div class="language-diff highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="p">handlers/handler-tracing-zipkin/src/main/java/org/apache/servicecomb/tracing/zipkin/TracingConfiguration.java
@@ -31,11 +31,11 @@</span>
import brave.http.HttpTracing;
import brave.propagation.CurrentTraceContext;
import org.apache.servicecomb.config.DynamicProperties;
<span class="gd">-import zipkin.Span;
-import zipkin.reporter.AsyncReporter;
-import zipkin.reporter.Reporter;
-import zipkin.reporter.Sender;
-import zipkin.reporter.okhttp3.OkHttpSender;
</span><span class="gi">+import zipkin2.Span;
+import zipkin2.reporter.AsyncReporter;
+import zipkin2.reporter.Reporter;
+import zipkin2.reporter.Sender;
+import zipkin2.reporter.okhttp3.OkHttpSender;
</span>
@Configuration
class TracingConfiguration {
<span class="p">@@ -56,14 +56,15 @@</span> Sender sender(DynamicProperties dynamicProperties) {
return AsyncReporter.builder(sender).build();
}
<span class="gi">+
</span> @Bean
Tracing tracing(Reporter&lt;Span&gt; reporter, DynamicProperties dynamicProperties,
CurrentTraceContext currentTraceContext) {
return Tracing.newBuilder()
.localServiceName(dynamicProperties.getStringProperty(CONFIG_QUALIFIED_MICROSERVICE_NAME_KEY,
DEFAULT_MICROSERVICE_NAME))
.currentTraceContext(currentTraceContext) // puts trace IDs into logs
<span class="gd">- .reporter(reporter)
</span><span class="gi">+ .spanReporter(reporter)
</span> .build();
}
</code></pre></div></div>
<p><strong>Note</strong>:</p>
<p>In the <a href="https://github.com/openzipkin/brave/releases/tag/4.7.1">brave release notes</a>, it’s stated that we need to use <code class="highlighter-rouge">create()</code> instead of <code class="highlighter-rouge">builder()</code></p>
<div class="language-diff highlighter-rouge"><div class="highlight"><pre class="highlight"><code>
/** Configuration for how to buffer spans into messages for Zipkin */
<span class="gd">- @Bean Reporter&lt;Span&gt; reporter() {
- return AsyncReporter.builder(sender()).build();
</span><span class="gi">+ @Bean Reporter&lt;Span&gt; spanReporter() {
+ return AsyncReporter.create(sender()).build();
</span> }
</code></pre></div></div>
<p>But this will not work. In <code class="highlighter-rouge">zipkin2.Reporter</code>, the <code class="highlighter-rouge">create(sender)</code> is actually equivalent to <code class="highlighter-rouge">builder(sender).build()</code></p>
<div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code> <span class="kd">public</span> <span class="kd">static</span> <span class="nc">AsyncReporter</span><span class="o">&lt;</span><span class="nc">Span</span><span class="o">&gt;</span> <span class="nf">create</span><span class="o">(</span><span class="nc">Sender</span> <span class="n">sender</span><span class="o">)</span> <span class="o">{</span>
<span class="k">return</span> <span class="o">(</span><span class="k">new</span> <span class="nc">AsyncReporter</span><span class="o">.</span><span class="na">Builder</span><span class="o">(</span><span class="n">sender</span><span class="o">)).</span><span class="na">build</span><span class="o">();</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="kd">static</span> <span class="nc">AsyncReporter</span><span class="o">.</span><span class="na">Builder</span> <span class="nf">builder</span><span class="o">(</span><span class="nc">Sender</span> <span class="n">sender</span><span class="o">)</span> <span class="o">{</span>
<span class="k">return</span> <span class="k">new</span> <span class="nc">AsyncReporter</span><span class="o">.</span><span class="na">Builder</span><span class="o">(</span><span class="n">sender</span><span class="o">);</span>
<span class="o">}</span>
</code></pre></div></div>
<h3 id="make-changes-according-to-the-changes-of-zipkinspan-and-zipkin2span">Make changes according to the changes of zipkin.Span and zipkin2.Span.</h3>
<p>We do not use zipkin.Span in our production code, but we do use it in our tests. Those changes are quite straight forward, we just change the accessing of fields to calling methods as described in the What’s Changed section.</p>
<div class="language-diff highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="p">tracing/tracing-zipkin/src/test/java/org/apache/servicecomb/tracing/zipkin/ZipkinSpanAspectTest.java
@@ -45,7 +45,7 @@</span>
import org.apache.servicecomb.tracing.zipkin.app.ZipkinSpanTestApplication;
import org.apache.servicecomb.tracing.zipkin.app.ZipkinSpanTestApplication.CustomSpanTask;
import org.apache.servicecomb.tracing.zipkin.app.ZipkinSpanTestApplication.SomeSlowTask;
<span class="gd">-import zipkin.Span;
</span><span class="gi">+import zipkin2.Span;
</span>
@RunWith(SpringRunner.class)
@SpringBootTest(classes = {ZipkinSpanTestApplication.class, TracingConfig.class})
<span class="p">@@ -74,8 +74,8 @@</span> public void reportedSpanContainsAnnotatedMethodInfo() throws Exception {
await().atMost(2, SECONDS).until(() -&gt; !spans.isEmpty());
<span class="gd">- zipkin.Span span = spans.poll();
- assertThat(span.name, is("crawl"));
</span><span class="gi">+ zipkin2.Span span = spans.poll();
+ assertThat(span.name(), is("crawl"));
</span> assertThat(tracedValues(span), contains(SomeSlowTask.class.getMethod("crawl").toString()));
}
<span class="p">@@ -84,17 +84,17 @@</span> public void reportCustomSpanInfomation() throws Exception {
customSpanTask.invoke();
await().atMost(2, SECONDS).until(() -&gt; !spans.isEmpty());
<span class="gd">- zipkin.Span span = spans.poll();
- assertThat(span.name, is("transaction1"));
</span><span class="gi">+ zipkin2.Span span = spans.poll();
+ assertThat(span.name(), is("transaction1"));
</span> assertThat(tracedValues(span), contains("startA"));
}
<span class="gd">- private List&lt;String&gt; tracedValues(zipkin.Span spans) {
- return spans.binaryAnnotations.stream()
- .filter(span -&gt; CALL_PATH.equals(span.key) || "error".equals(span.key))
- .filter(span -&gt; span.value != null)
- .map(annotation -&gt; new String(annotation.value))
</span><span class="gi">+ private List&lt;String&gt; tracedValues(zipkin2.Span spans) {
+ return spans.tags().entrySet().stream()
+ .filter(span -&gt; CALL_PATH.equals(span.getKey()) || "error".equals(span.getKey()))
+ .filter(span -&gt; span.getValue() != null)
+ .map(annotation -&gt; new String(annotation.getValue()))
</span> .distinct()
.collect(Collectors.toList());
}
<span class="p">@@ -110,7 +110,7 @@</span> public void reportCustomSpanInfomation() throws Exception {
Tracing tracing(Queue&lt;Span&gt; spans) {
return Tracing.newBuilder()
.currentTraceContext(new StrictCurrentTraceContext())
<span class="gd">- .reporter(spans::add)
</span><span class="gi">+ .spanReporter(spans::add)
</span> .build();
}
}
</code></pre></div></div>
<h3 id="support-both-v1-and-v2-api-of-zipkin-server">Support both v1 and v2 api of zipkin server.</h3>
<p>Our customers may be still running a zipkin server prior to 1.31 which does not support the v2 http api. So we added an option to let them specify the server api version.</p>
<p>Supporting v1 api is built into zipkin2, so we do not need to rely on the v1 libraries. Just use the <code class="highlighter-rouge">SpanBytesEncoder.JSON_V1</code> when building reporter and change the sender api path.</p>
<div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="n">sender</span> <span class="o">=</span> <span class="nc">URLConnectionSender</span><span class="o">.</span><span class="na">create</span><span class="o">(</span><span class="s">"http://localhost:9411/api/v1/spans"</span><span class="o">)</span>
<span class="n">reporter</span> <span class="o">=</span> <span class="nc">AsyncReporter</span><span class="o">.</span><span class="na">builder</span><span class="o">(</span><span class="n">sender</span><span class="o">)</span>
<span class="o">.</span><span class="na">build</span><span class="o">(</span><span class="nc">SpanBytesEncoder</span><span class="o">.</span><span class="na">JSON_V1</span><span class="o">);</span>
</code></pre></div></div>
<p>That’s all, for the complete changes, please refer the <a href="https://github.com/apache/incubator-servicecomb-java-chassis/pull/488">pull request</a> for the complete changes.</p>
<h2 id="references">References</h2>
<ul>
<li><a href="https://github.com/openzipkin/zipkin/releases/tag/2.0.0">Zipkin 2.0.0 release notes</a></li>
<li><a href="https://github.com/openzipkin/brave/releases/tag/4.7.1">Brave 4.7.1 release notes</a></li>
<li><a href="https://github.com/openzipkin/brave/tree/master/brave">Brave API V4</a></li>
</ul>
</section>
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<p class="page__date"><strong><i class="fa fa-fw fa-calendar" aria-hidden="true"></i> Updated:</strong> <time datetime="2018-01-11">January 11, 2018</time></p>
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