Use traceId as the judgment condition for sampling trace. (#5386)

oap-server/analyzer/agent-analyzer/src/main/java/org/apache/skywalking/oap/server/analyzer/provider/trace/parser/listener/SegmentAnalysisListener.java

@@ -126,7 +126,7 @@ public class SegmentAnalysisListener implements FirstAnalysisListener, EntryAnal
     @Override
     public void parseSegment(SegmentObject segmentObject) {
         if (sampleStatus.equals(SAMPLE_STATUS.UNKNOWN) || sampleStatus.equals(SAMPLE_STATUS.IGNORE)) {
-            if (sampler.shouldSample(segmentObject.getTraceSegmentId())) {
+            if (sampler.shouldSample(segmentObject.getTraceId())) {
                 sampleStatus = SAMPLE_STATUS.SAMPLED;
             } else {
                 sampleStatus = SAMPLE_STATUS.IGNORE;

oap-server/analyzer/agent-analyzer/src/main/java/org/apache/skywalking/oap/server/analyzer/provider/trace/parser/listener/TraceSegmentSampler.java

@@ -31,7 +31,7 @@ public class TraceSegmentSampler {
         this.traceSampleRateWatcher = traceSampleRateWatcher;
     }
 
-    public boolean shouldSample(String segmentId) {
-        return segmentId.hashCode() % 10000 < traceSampleRateWatcher.getSampleRate();
+    public boolean shouldSample(String traceId) {
+        return traceId.hashCode() % 10000 < traceSampleRateWatcher.getSampleRate();
     }
 }