observability: PDML + some batch write spans

This change adds spans for Partitioned DML and making
updates for Batch.

Carved out from PR googleapis#1241.

Author: odeke-em

google/cloud/spanner_v1/batch.py

@@ -336,7 +336,7 @@ def batch_write(self, request_options=None, exclude_txn_from_change_streams=Fals
         )
         observability_options = getattr(database, "observability_options", None)
         with trace_call(
-            "CloudSpanner.BatchWrite",
+            "CloudSpanner.batch_write",
             self._session,
             trace_attributes,
             observability_options=observability_options,

google/cloud/spanner_v1/database.py

@@ -699,7 +699,8 @@ def execute_partitioned_dml(
             )
 
         def execute_pdml():
-            with SessionCheckout(self._pool) as session:
+            def do_execute_pdml(session, span):
+                add_span_event(span, "Starting BeginTransaction")
                 txn = api.begin_transaction(
                     session=session.name, options=txn_options, metadata=metadata
                 )
@@ -732,6 +733,13 @@ def execute_pdml():
 
                 return result_set.stats.row_count_lower_bound
 
+            with trace_call(
+                "CloudSpanner.Database.execute_partitioned_pdml",
+                observability_options=self.observability_options,
+            ) as span:
+                with SessionCheckout(self._pool) as session:
+                    return do_execute_pdml(session, span)
+
         return _retry_on_aborted(execute_pdml, DEFAULT_RETRY_BACKOFF)()
 
     def session(self, labels=None, database_role=None):
@@ -1349,6 +1357,10 @@ def to_dict(self):
             "transaction_id": snapshot._transaction_id,
         }
 
+    @property
+    def observability_options(self):
+        return getattr(self._database, "observability_options", {})
+
     def _get_session(self):
         """Create session as needed.
 
@@ -1468,27 +1480,32 @@ def generate_read_batches(
             mappings of information used perform actual partitioned reads via
             :meth:`process_read_batch`.
         """
-        partitions = self._get_snapshot().partition_read(
-            table=table,
-            columns=columns,
-            keyset=keyset,
-            index=index,
-            partition_size_bytes=partition_size_bytes,
-            max_partitions=max_partitions,
-            retry=retry,
-            timeout=timeout,
-        )
+        with trace_call(
+            f"CloudSpanner.{type(self).__name__}.generate_read_batches",
+            extra_attributes=dict(table=table, columns=columns),
+            observability_options=self.observability_options,
+        ):
+            partitions = self._get_snapshot().partition_read(
+                table=table,
+                columns=columns,
+                keyset=keyset,
+                index=index,
+                partition_size_bytes=partition_size_bytes,
+                max_partitions=max_partitions,
+                retry=retry,
+                timeout=timeout,
+            )
 
-        read_info = {
-            "table": table,
-            "columns": columns,
-            "keyset": keyset._to_dict(),
-            "index": index,
-            "data_boost_enabled": data_boost_enabled,
-            "directed_read_options": directed_read_options,
-        }
-        for partition in partitions:
-            yield {"partition": partition, "read": read_info.copy()}
+            read_info = {
+                "table": table,
+                "columns": columns,
+                "keyset": keyset._to_dict(),
+                "index": index,
+                "data_boost_enabled": data_boost_enabled,
+                "directed_read_options": directed_read_options,
+            }
+            for partition in partitions:
+                yield {"partition": partition, "read": read_info.copy()}
 
     def process_read_batch(
         self,
@@ -1514,12 +1531,17 @@ def process_read_batch(
         :rtype: :class:`~google.cloud.spanner_v1.streamed.StreamedResultSet`
         :returns: a result set instance which can be used to consume rows.
         """
-        kwargs = copy.deepcopy(batch["read"])
-        keyset_dict = kwargs.pop("keyset")
-        kwargs["keyset"] = KeySet._from_dict(keyset_dict)
-        return self._get_snapshot().read(
-            partition=batch["partition"], **kwargs, retry=retry, timeout=timeout
-        )
+        observability_options = self.observability_options or {}
+        with trace_call(
+            f"CloudSpanner.{type(self).__name__}.process_read_batch",
+            observability_options=observability_options,
+        ):
+            kwargs = copy.deepcopy(batch["read"])
+            keyset_dict = kwargs.pop("keyset")
+            kwargs["keyset"] = KeySet._from_dict(keyset_dict)
+            return self._get_snapshot().read(
+                partition=batch["partition"], **kwargs, retry=retry, timeout=timeout
+            )
 
     def generate_query_batches(
         self,
@@ -1594,34 +1616,39 @@ def generate_query_batches(
             mappings of information used perform actual partitioned reads via
             :meth:`process_read_batch`.
         """
-        partitions = self._get_snapshot().partition_query(
-            sql=sql,
-            params=params,
-            param_types=param_types,
-            partition_size_bytes=partition_size_bytes,
-            max_partitions=max_partitions,
-            retry=retry,
-            timeout=timeout,
-        )
+        with trace_call(
+            f"CloudSpanner.{type(self).__name__}.generate_query_batches",
+            extra_attributes=dict(sql=sql),
+            observability_options=self.observability_options,
+        ):
+            partitions = self._get_snapshot().partition_query(
+                sql=sql,
+                params=params,
+                param_types=param_types,
+                partition_size_bytes=partition_size_bytes,
+                max_partitions=max_partitions,
+                retry=retry,
+                timeout=timeout,
+            )
 
-        query_info = {
-            "sql": sql,
-            "data_boost_enabled": data_boost_enabled,
-            "directed_read_options": directed_read_options,
-        }
-        if params:
-            query_info["params"] = params
-            query_info["param_types"] = param_types
-
-        # Query-level options have higher precedence than client-level and
-        # environment-level options
-        default_query_options = self._database._instance._client._query_options
-        query_info["query_options"] = _merge_query_options(
-            default_query_options, query_options
-        )
+            query_info = {
+                "sql": sql,
+                "data_boost_enabled": data_boost_enabled,
+                "directed_read_options": directed_read_options,
+            }
+            if params:
+                query_info["params"] = params
+                query_info["param_types"] = param_types
+
+            # Query-level options have higher precedence than client-level and
+            # environment-level options
+            default_query_options = self._database._instance._client._query_options
+            query_info["query_options"] = _merge_query_options(
+                default_query_options, query_options
+            )
 
-        for partition in partitions:
-            yield {"partition": partition, "query": query_info}
+            for partition in partitions:
+                yield {"partition": partition, "query": query_info}
 
     def process_query_batch(
         self,
@@ -1646,9 +1673,16 @@ def process_query_batch(
         :rtype: :class:`~google.cloud.spanner_v1.streamed.StreamedResultSet`
         :returns: a result set instance which can be used to consume rows.
         """
-        return self._get_snapshot().execute_sql(
-            partition=batch["partition"], **batch["query"], retry=retry, timeout=timeout
-        )
+        with trace_call(
+            f"CloudSpanner.{type(self).__name__}.process_query_batch",
+            observability_options=self.observability_options,
+        ):
+            return self._get_snapshot().execute_sql(
+                partition=batch["partition"],
+                **batch["query"],
+                retry=retry,
+                timeout=timeout,
+            )
 
     def run_partitioned_query(
         self,
@@ -1703,18 +1737,23 @@ def run_partitioned_query(
         :rtype: :class:`~google.cloud.spanner_v1.merged_result_set.MergedResultSet`
         :returns: a result set instance which can be used to consume rows.
         """
-        partitions = list(
-            self.generate_query_batches(
-                sql,
-                params,
-                param_types,
-                partition_size_bytes,
-                max_partitions,
-                query_options,
-                data_boost_enabled,
+        with trace_call(
+            f"CloudSpanner.${type(self).__name__}.run_partitioned_query",
+            extra_attributes=dict(sql=sql),
+            observability_options=self.observability_options,
+        ):
+            partitions = list(
+                self.generate_query_batches(
+                    sql,
+                    params,
+                    param_types,
+                    partition_size_bytes,
+                    max_partitions,
+                    query_options,
+                    data_boost_enabled,
+                )
             )
-        )
-        return MergedResultSet(self, partitions, 0)
+            return MergedResultSet(self, partitions, 0)
 
     def process(self, batch):
         """Process a single, partitioned query or read.

google/cloud/spanner_v1/merged_result_set.py

@@ -37,6 +37,16 @@ def __init__(self, batch_snapshot, partition_id, merged_result_set):
         self._queue: Queue[PartitionExecutorResult] = merged_result_set._queue
 
     def run(self):
+        observability_options = getattr(
+            self._batch_snapshot, "observability_options", {}
+        )
+        with trace_call(
+            "CloudSpanner.PartitionExecutor.run",
+            observability_options=observability_options,
+        ):
+            return self.__run()
+
+    def __run(self):
         results = None
         try:
             results = self._batch_snapshot.process_query_batch(self._partition_id)

google/cloud/spanner_v1/pool.py

@@ -523,12 +523,11 @@ def bind(self, database):
             metadata.append(
                 _metadata_with_leader_aware_routing(database._route_to_leader_enabled)
             )
-        created_session_count = 0
         self._database_role = self._database_role or self._database.database_role
 
         request = BatchCreateSessionsRequest(
             database=database.name,
-            session_count=self.size - created_session_count,
+            session_count=self.size,
             session_template=Session(creator_role=self.database_role),
         )
 
@@ -549,38 +548,28 @@ def bind(self, database):
             span_event_attributes,
         )
 
-        if created_session_count >= self.size:
-            add_span_event(
-                current_span,
-                "Created no new sessions as sessionPool is full",
-                span_event_attributes,
-            )
-            return
-
-        add_span_event(
-            current_span,
-            f"Creating {request.session_count} sessions",
-            span_event_attributes,
-        )
-
         observability_options = getattr(self._database, "observability_options", None)
         with trace_call(
             "CloudSpanner.PingingPool.BatchCreateSessions",
             observability_options=observability_options,
         ) as span:
             returned_session_count = 0
-            while created_session_count < self.size:
+            while returned_session_count < self.size:
                 resp = api.batch_create_sessions(
                     request=request,
                     metadata=metadata,
                 )
+
+                add_span_event(
+                    span,
+                    f"Created {len(resp.session)} sessions",
+                )
+
                 for session_pb in resp.session:
                     session = self._new_session()
+                    returned_session_count += 1
                     session._session_id = session_pb.name.split("/")[-1]
                     self.put(session)
-                    returned_session_count += 1
-
-                created_session_count += len(resp.session)
 
             add_span_event(
                 span,

google/cloud/spanner_v1/session.py

@@ -470,6 +470,7 @@ def run_in_transaction(self, func, *args, **kw):
         ) as span:
             while True:
                 if self._transaction is None:
+                    add_span_event(span, "Creating Transaction")
                     txn = self.transaction()
                     txn.transaction_tag = transaction_tag
                     txn.exclude_txn_from_change_streams = (

google/cloud/spanner_v1/snapshot.py

@@ -675,10 +675,13 @@ def partition_read(
         )
 
         trace_attributes = {"table_id": table, "columns": columns}
+        can_include_index = (index != "") and (index is not None)
+        if can_include_index:
+            trace_attributes["index"] = index
+
         with trace_call(
             f"CloudSpanner.{type(self).__name__}.partition_read",
-            self._session,
-            trace_attributes,
+            extra_attributes=trace_attributes,
             observability_options=getattr(database, "observability_options", None),
         ):
             method = functools.partial(
@@ -779,7 +782,7 @@ def partition_query(
 
         trace_attributes = {"db.statement": sql}
         with trace_call(
-            "CloudSpanner.PartitionReadWriteTransaction",
+            f"CloudSpanner.{type(self).__name__}.partition_query",
             self._session,
             trace_attributes,
             observability_options=getattr(database, "observability_options", None),

tests/_helpers.py

@@ -86,7 +86,7 @@ def assertSpanAttributes(
     ):
         if HAS_OPENTELEMETRY_INSTALLED:
             if not span:
-                span_list = self.ot_exporter.get_finished_spans()
+                span_list = self.get_finished_spans()
                 self.assertEqual(len(span_list) > 0, True)
                 span = span_list[0]
 

tests/system/test_observability_options.py

@@ -37,7 +37,7 @@
     not HAS_OTEL_INSTALLED, reason="OpenTelemetry is necessary to test traces."
 )
 @pytest.mark.skipif(
-    not _helpers.USE_EMULATOR, reason="mulator is necessary to test traces."
+    not _helpers.USE_EMULATOR, reason="Emulator is necessary to test traces."
 )
 def test_observability_options_propagation():
     PROJECT = _helpers.EMULATOR_PROJECT
@@ -108,6 +108,7 @@ def test_propagation(enable_extended_tracing):
         wantNames = [
             "CloudSpanner.CreateSession",
             "CloudSpanner.Snapshot.execute_streaming_sql",
+            "CloudSpanner.Database.snapshot",
         ]
         assert gotNames == wantNames