1
我在CosmosDB中創建了一個帶有兩個頂點類型，一個actor頂點和一個電影頂點的圖。存在的唯一邊類型是「執行」類型。你可以想象這個圖表有很多演員和許多電影，任何給定的演員可能已經在任何數量的電影中演過。節點之間的路徑查詢從未結束
我想寫一個查詢，將發現並返回兩個參與者之間的路徑。例如，Keanu Reeves和Laurence Fishburn一起在Matrix中演出。 Laurence Fishburn在電影「現代啓示錄」中飾演馬龍白蘭度。因此，基努裏維斯和馬龍白蘭度之間的道路是基努裏維斯 - >矩陣 - >勞倫斯菲什伯恩 - >現代啓示錄 - >馬龍白蘭度。
這是我想出的查詢。
g.V('keanureeves')
.repeat(both().simplePath())
.until(hasId('marlonbrando'))
.path()
.limit(1)
查詢適用於小圖。我可以查詢和構建路徑。但是，一旦我達到某個圖形大小，查詢超時並且永遠不會結束。
我在本地使用CosmosDB模擬器，而不是真正的Azure上的CosmosDB。很難說數據庫中有多少文檔，因爲模擬器UI並沒有給我一種查詢計數的方法。
我可以在不更改數據模型的情況下加快查詢速度嗎？如果我必須更改我的數據模型，那麼可能會更好？我是圖形數據庫和Gremlin的新手。
編輯：它似乎發生在1200和1300之間的文件。在1200文件下，結果返回。這裏的文檔類型的故障：
540 movie vertexes
112 actor vertexes
681 actedIn edges
編輯＃2：我使用的是Microsoft.Azure.Graphs NuGet包，它看起來像我調用拋出內存溢出異常的方法。我的代碼：
public async Task<IList<T>> ExecuteQueryAsync<T>(string gremlinQuery)
{
var query = _documentClient.CreateGremlinQuery(_graph, gremlinQuery);
var results = new List<T>();
while (query.HasMoreResults)
{
var feed = await query.ExecuteNextAsync<T>();
results.AddRange(feed.Select(x => x));
}
return results;
}
堆棧跟蹤：
System.AggregateException: One or more errors occurred. ---> System.OutOfMemoryException: Exception of type 'System.OutOfMemoryException' was thrown.
at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1.GetTaskForResult(TResult result)
at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1.SetResult(TResult result)
at Microsoft.Azure.Graphs.Runtime.Operators.ProjectOperator.<NextAsync>d__4.MoveNext()
at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1.Start[TStateMachine](TStateMachine& stateMachine)
at Microsoft.Azure.Graphs.Runtime.Operators.ProjectOperator.NextAsync()
at Microsoft.Azure.Graphs.Runtime.ScalarSubqueryFunction.<EvaluateAsync>d__3.MoveNext()
--- End of inner exception stack trace ---
at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)
at System.Threading.Tasks.Task`1.get_Result()
at Microsoft.Azure.Graphs.Runtime.Operators.PathOperator.GetStepProjectionResult(FieldObject step, Int32& activeByFuncIndex)
at Microsoft.Azure.Graphs.Runtime.Operators.PathOperator.<NextAsync>d__4.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Azure.Graphs.Runtime.Operators.SimplePathOperator.<NextAsync>d__3.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task)
at Microsoft.Azure.Graphs.Runtime.Operators.PathOperator.<NextAsync>d__4.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Azure.Graphs.Runtime.Operators.ProjectOperator.<NextAsync>d__4.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task)
at Microsoft.Azure.Graphs.Runtime.Operators.RepeatOperator.<NextAsync>d__18.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task)
at Microsoft.Azure.Graphs.Runtime.Operators.PathOperator.<NextAsync>d__4.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Azure.Graphs.Runtime.Operators.RangeOperator.<NextAsync>d__5.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Azure.Graphs.Runtime.Operators.ProjectOperator.<NextAsync>d__4.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Azure.Graphs.GraphTraversal.GraphTraversalIterator.<CurrentOperatorNextAsync>d__14.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Azure.Graphs.GraphTraversal.GraphTraversalIterator.<MoveNextAsync>d__5.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Azure.Graphs.GraphTraversal.<MoveNextAsync>d__17.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Azure.Graphs.GremlinDocumentQuery`1.<ExecuteNextAsync>d__15`1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
at Octogami.SixDegreesOfNetflix.Application.Data.GremlinClient.<ExecuteQueryAsync>d__3`1.MoveNext() in C:\dev\SixDegreesOfNetflix\Application\Data\GremlinClient.cs:line 28
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
at Octogami.SixDegreesOfNetflix.Application.Data.ActorPathRepository.<GetPathBetweenActors>d__2.MoveNext() in C:\dev\SixDegreesOfNetflix\Application\Data\ActorPathRepository.cs:line 20
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
at Octogami.SixDegreesOfNetflix.Application.Feature.GetPathBetweenActorsCommandHandler.<Handle>d__3.MoveNext() in C:\dev\SixDegreesOfNetflix\Application\Feature\GetPathBetweenActors.cs:line 42
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
at Octogami.SixDegreesOfNetflix.Website.Controllers.ActorController.<DegreesOfSeparation>d__5.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeActionMethodAsync>d__27.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeNextActionFilterAsync>d__25.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Rethrow(ActionExecutedContext context)
at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeNextResourceFilter>d__22.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Rethrow(ResourceExecutedContext context)
at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeAsync>d__20.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.AspNetCore.Builder.RouterMiddleware.<Invoke>d__4.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.<Invoke>d__7.MoveNext()
---> (Inner Exception #0) System.OutOfMemoryException: Exception of type 'System.OutOfMemoryException' was thrown.
at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1.GetTaskForResult(TResult result)
at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1.SetResult(TResult result)
at Microsoft.Azure.Graphs.Runtime.Operators.ProjectOperator.<NextAsync>d__4.MoveNext()
at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1.Start[TStateMachine](TStateMachine& stateMachine)
at Microsoft.Azure.Graphs.Runtime.Operators.ProjectOperator.NextAsync()
at Microsoft.Azure.Graphs.Runtime.ScalarSubqueryFunction.<EvaluateAsync>d__3.MoveNext()<---