ramkrish86 commented on a change in pull request #1210: HBASE-23757.
[OpenTracing] Migrate from HTrace to OpenTracing (Java code)
URL: https://github.com/apache/hbase/pull/1210#discussion_r385262996
##########
File path:
hbase-common/src/main/java/org/apache/hadoop/hbase/trace/TraceUtil.java
##########
@@ -17,103 +17,169 @@
*/
package org.apache.hadoop.hbase.trace;
+import io.opentracing.Scope;
+import io.opentracing.SpanContext;
+import io.opentracing.mock.MockTracer;
+import io.opentracing.propagation.Format;
+import io.opentracing.propagation.TextMapExtractAdapter;
+import io.opentracing.propagation.TextMapInjectAdapter;
+import io.opentracing.Span;
+import io.opentracing.SpanContext;
+import io.opentracing.Tracer;
+import io.opentracing.propagation.Format;
+import io.opentracing.propagation.TextMapExtractAdapter;
+import io.opentracing.propagation.TextMapInjectAdapter;
+import io.opentracing.util.GlobalTracer;
+import org.apache.commons.codec.binary.Hex;
import org.apache.hadoop.conf.Configuration;
import org.apache.htrace.core.HTraceConfiguration;
import org.apache.htrace.core.Sampler;
-import org.apache.htrace.core.Span;
import org.apache.htrace.core.SpanReceiver;
import org.apache.htrace.core.TraceScope;
-import org.apache.htrace.core.Tracer;
+import io.jaegertracing.Configuration.SamplerConfiguration;
+
+import org.apache.hadoop.tracing.TraceUtils;
+import
org.apache.hbase.thirdparty.com.google.common.annotations.VisibleForTesting;
import org.apache.yetus.audience.InterfaceAudience;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.util.HashMap;
+import java.util.Map;
/**
* This wrapper class provides functions for accessing htrace 4+ functionality
in a simplified way.
*/
@InterfaceAudience.Private
public final class TraceUtil {
- private static HTraceConfiguration conf;
- private static Tracer tracer;
+ static final Logger LOG = LoggerFactory.getLogger(TraceUtils.class);
+
+ private static io.jaegertracing.Configuration conf;
+ private static io.opentracing.Tracer tracer;
+
+ public static final String HBASE_OPENTRACING_TRACER =
"hbase.opentracing.tracer";
+ public static final String HBASE_OPENTRACING_TRACER_DEFAULT = "jaeger";
+ public static final String HBASE_OPENTRACING_MOCKTRACER = "mock";
private TraceUtil() {
}
- public static void initTracer(Configuration c) {
- if (c != null) {
- conf = new HBaseHTraceConfiguration(c);
+ public static void initTracer(Configuration c, String serviceName) {
+ if (GlobalTracer.isRegistered()) {
+ LOG.info("A tracer is already registered.");
+ return;
}
- if (tracer == null && conf != null) {
- tracer = new Tracer.Builder("Tracer").conf(conf).build();
+ switch(c.get(HBASE_OPENTRACING_TRACER, HBASE_OPENTRACING_TRACER_DEFAULT)) {
+ case HBASE_OPENTRACING_TRACER_DEFAULT:
+ io.jaegertracing.Configuration conf =
io.jaegertracing.Configuration.fromEnv(serviceName);
+ tracer = conf.getTracerBuilder().build();
+ break;
+ case HBASE_OPENTRACING_MOCKTRACER:
+ tracer = new MockTracer();
+ break;
+ default:
+ throw new RuntimeException("Unexpected tracer");
}
+
+
+ GlobalTracer.register(tracer);
+
+ }
+
+ /*@VisibleForTesting
+ public static void registerTracerForTest(Tracer tracer) {
+ TraceUtil.tracer = tracer;
+ GlobalTracer.register(tracer);
+ }*/
+
+ public static Tracer getTracer() {
+ return tracer;
}
/**
- * Wrapper method to create new TraceScope with the given description
- * @return TraceScope or null when not tracing
+ * Wrapper method to create new Scope with the given description
+ * @return Scope or null when not tracing
*/
- public static TraceScope createTrace(String description) {
- return (tracer == null) ? null : tracer.newScope(description);
+ public static Scope createTrace(String description) {
+ return (tracer == null) ? null :
+ tracer.buildSpan(description).startActive(true);
}
/**
- * Wrapper method to create new child TraceScope with the given description
+ * Wrapper method to create new child Scope with the given description
* and parent scope's spanId
* @param span parent span
- * @return TraceScope or null when not tracing
+ * @return Scope or null when not tracing
*/
- public static TraceScope createTrace(String description, Span span) {
- if (span == null) {
- return createTrace(description);
- }
+ public static Scope createTrace(String description, Span span) {
+ if(span == null) return createTrace(description);
+
+ return (tracer == null) ? null : tracer.buildSpan(description).
+ asChildOf(span).startActive(true);
+ }
+
+ public static Scope createTrace(String description, SpanContext spanContext)
{
+ if(spanContext == null) return createTrace(description);
- return (tracer == null) ? null : tracer.newScope(description,
span.getSpanId());
+ return (tracer == null) ? null : tracer.buildSpan(description).
+ asChildOf(spanContext).startActive(true);
}
/**
* Wrapper method to add new sampler to the default tracer
* @return true if added, false if it was already added
*/
- public static boolean addSampler(Sampler sampler) {
+ public static boolean addSampler(SamplerConfiguration sampler) {
if (sampler == null) {
return false;
}
- return (tracer == null) ? false : tracer.addSampler(sampler);
+ conf = conf.withSampler(sampler);
Review comment:
I think this is getting called from clients which needs the tracing. This
'conf' may be null I believe when this is called. @jojochuang - thanks for
pointing to me to the docs. I was trying do some similar stuff and I took your
patch as a reference. Now there are some quesitons - Assume I have kept my
RegionServer to work with No sampling (just assume I don trace the
flushes/compactions). Now if the client side I have enabled some
sampling(tracing) say for eg writes - if the writes are propogated to the
server and we do the tracing - in that case will the sampling applied as what
the client has decided ?
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