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+# Copyright (c) 2016 Uber Technologies, Inc.
+#
+# Licensed 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.
+
+namespace cpp jaegertracing.thrift
+namespace java io.jaegertracing.thriftjava
+namespace php Jaeger.Thrift
+namespace netcore Jaeger.Thrift
+
+# TagType denotes the type of a Tag's value.
+enum TagType { STRING, DOUBLE, BOOL, LONG, BINARY }
+
+# Tag is a basic strongly typed key/value pair. It has been flattened to reduce the use of pointers in golang
+struct Tag {
+  1: required string  key
+  2: required TagType vType
+  3: optional string  vStr
+  4: optional double  vDouble
+  5: optional bool    vBool
+  6: optional i64     vLong
+  7: optional binary  vBinary
+}
+
+# Log is a timed even with an arbitrary set of tags.
+struct Log {
+  1: required i64       timestamp
+  2: required list<Tag> fields
+}
+
+enum SpanRefType { CHILD_OF, FOLLOWS_FROM }
+
+# SpanRef describes causal relationship of the current span to another span (e.g. 'child-of')
+struct SpanRef {
+  1: required SpanRefType refType
+  2: required i64         traceIdLow
+  3: required i64         traceIdHigh
+  4: required i64         spanId
+}
+
+# Span represents a named unit of work performed by a service.
+struct Span {
+  1:  required i64           traceIdLow   # the least significant 64 bits of a traceID
+  2:  required i64           traceIdHigh  # the most significant 64 bits of a traceID; 0 when only 64bit IDs are used
+  3:  required i64           spanId       # unique span id (only unique within a given trace)
+  4:  required i64           parentSpanId # since nearly all spans will have parents spans, CHILD_OF refs do not have to be explicit
+  5:  required string        operationName
+  6:  optional list<SpanRef> references   # causal references to other spans
+  7:  required i32           flags        # a bit field used to propagate sampling decisions. 1 signifies a SAMPLED span, 2 signifies a DEBUG span.
+  8:  required i64           startTime
+  9:  required i64           duration
+  10: optional list<Tag>     tags
+  11: optional list<Log>     logs
+}
+
+# Process describes the traced process/service that emits spans.
+struct Process {
+  1: required string    serviceName
+  2: optional list<Tag> tags
+}
+
+# Batch is a collection of spans reported out of process.
+struct Batch {
+  1: required Process    process
+  2: required list<Span> spans
+}
+
+# BatchSubmitResponse is the response on submitting a batch. 
+struct BatchSubmitResponse {
+    1: required bool ok   # The Collector's client is expected to only log (or emit a counter) when not ok equals false
+}
+
+service Collector  {
+    list<BatchSubmitResponse> submitBatches(1: list<Batch> batches)
+}