FrankinRUC commented on a change in pull request #217:
URL: 
https://github.com/apache/incubator-yunikorn-core/pull/217#discussion_r514078675



##########
File path: pkg/scheduler/trace_utils.go
##########
@@ -0,0 +1,85 @@
+/*
+ Licensed to the Apache Software Foundation (ASF) under one
+ or more contributor license agreements.  See the NOTICE file
+ distributed with this work for additional information
+ regarding copyright ownership.  The ASF licenses this file
+ to you under the Apache License, Version 2.0 (the
+ "License"); you may not use this file except in compliance
+ with the License.  You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+*/
+
+package scheduler
+
+import (
+       "fmt"
+
+       "github.com/opentracing/opentracing-go"
+
+       "github.com/apache/incubator-yunikorn-core/pkg/trace"
+)
+
+const (
+       LevelKey = "level"
+       PhaseKey = "phase"
+       NameKey  = "name"
+       StateKey = "state"
+       InfoKey  = "info"
+)
+
+// startSpanWrapper simplifies span starting process by integrating general 
tags' setting.
+// The level tag is required, nonempty and logs span's scheduling level. 
(root, partition, queue, ...)
+// The phase tag is optional and logs span's calling phase. (reservedAllocate, 
tryAllocate, allocate, ...)
+// The name tag is optional and logs span's related object's identity. 
(resources' name or ID)

Review comment:
       We can only set the state and info tags after we get the result of the 
calling, so they are wrapped in the finishActiveSpanWrapper.




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