ObjectDisposedException in Gremlinq After Service Inactivity

[EliorGigi]

Description:

I have developed an ASP.NET Core Web API utilizing Gremlinq for CosmosDB graph data access. The service, injected with IGremlinQuerySource, is registered as a singleton.

The issue arises after the service has been inactive for a few hours. Subsequently, the first Gremlin query results in a System.ObjectDisposedException associated with the semaphore.

Error log:

[2024/02/22 22:51:42.583  DBG]  ThreadId :74 ExRam.Gremlinq.Core.AspNet.GremlinqQueries Executing Gremlin query 2d455629-6d93-4720-89c5-9bb3c6f7d5c9 (Script=g.V(_a).hasLabel(_b).limit(_c), Bindings={}). 
[2024/02/22 22:51:42.584  ERR]  ThreadId :74 ExRam.Gremlinq.Core.AspNet.GremlinqQueries Execution of Gremlin query 2d455629-6d93-4720-89c5-9bb3c6f7d5c9 failed. 
System.ObjectDisposedException: The semaphore has been disposed.

Any idea what could be going wrong? It occurs for every Gremlin query and not for a specific one.

[EliorGigi]

full error log:

[2024/02/22 22:51:42.583  DBG]  ThreadId :74 ExRam.Gremlinq.Core.AspNet.GremlinqQueries Executing Gremlin query 2d455629-6d93-4720-89c5-9bb3c6f7d5c9 (Script=g.V(_a).hasLabel(_b).limit(_c), Bindings={}). 
[2024/02/22 22:51:42.584  ERR]  ThreadId :74 ExRam.Gremlinq.Core.AspNet.GremlinqQueries Execution of Gremlin query 2d455629-6d93-4720-89c5-9bb3c6f7d5c9 failed. 
System.ObjectDisposedException: The semaphore has been disposed.
   at System.Threading.SemaphoreSlim.CheckDispose()
   at System.Threading.SemaphoreSlim.WaitAsync(Int32 millisecondsTimeout, CancellationToken cancellationToken)
   at System.Threading.SemaphoreSlim.WaitAsync(CancellationToken cancellationToken)
   at ExRam.Gremlinq.Providers.Core.WebSocketGremlinqClientFactory.WebSocketGremlinqClientFactoryImpl`1.WebSocketGremlinqClient.SendCore(RequestMessage requestMessage, CancellationToken ct) in /_/src/Providers.Core/Factory/WebSocketGremlinqClientFactory.cs:line 287
   at ExRam.Gremlinq.Providers.Core.WebSocketGremlinqClientFactory.WebSocketGremlinqClientFactoryImpl`1.WebSocketGremlinqClient.<SubmitAsync>g__Core|12_0[T](RequestMessage message, WebSocketGremlinqClient this, CancellationToken ct)+MoveNext() in /_/src/Providers.Core/Factory/WebSocketGremlinqClientFactory.cs:line 234
   at ExRam.Gremlinq.Providers.Core.WebSocketGremlinqClientFactory.WebSocketGremlinqClientFactoryImpl`1.WebSocketGremlinqClient.<SubmitAsync>g__Core|12_0[T](RequestMessage message, WebSocketGremlinqClient this, CancellationToken ct)+System.Threading.Tasks.Sources.IValueTaskSource<System.Boolean>.GetResult()
   at ExRam.Gremlinq.Providers.Core.GremlinqClientExtensions.ThrottledGremlinqClient.<SubmitAsync>g__Core|5_0[T](RequestMessage message, ThrottledGremlinqClient this, CancellationToken ct)+MoveNext() in /_/src/Providers.Core/Extensions/GremlinqClientExtensions.cs:line 181
   at ExRam.Gremlinq.Providers.Core.GremlinqClientExtensions.ThrottledGremlinqClient.<SubmitAsync>g__Core|5_0[T](RequestMessage message, ThrottledGremlinqClient this, CancellationToken ct)+MoveNext() in /_/src/Providers.Core/Extensions/GremlinqClientExtensions.cs:line 181
   at ExRam.Gremlinq.Providers.Core.GremlinqClientExtensions.ThrottledGremlinqClient.<SubmitAsync>g__Core|5_0[T](RequestMessage message, ThrottledGremlinqClient this, CancellationToken ct)+System.Threading.Tasks.Sources.IValueTaskSource<System.Boolean>.GetResult()
   at ExRam.Gremlinq.Providers.Core.GremlinqClientFactory.PoolGremlinqClientFactory`1.PoolGremlinqClient.<SubmitAsync>g__Core|8_0[T](RequestMessage message, PoolGremlinqClient this, CancellationToken ct)+MoveNext() in /_/src/Providers.Core/Factory/GremlinqClientFactory.cs:line 84
   at ExRam.Gremlinq.Providers.Core.GremlinqClientFactory.PoolGremlinqClientFactory`1.PoolGremlinqClient.<SubmitAsync>g__Core|8_0[T](RequestMessage message, PoolGremlinqClient this, CancellationToken ct)+MoveNext() in /_/src/Providers.Core/Factory/GremlinqClientFactory.cs:line 97
   at ExRam.Gremlinq.Providers.Core.GremlinqClientFactory.PoolGremlinqClientFactory`1.PoolGremlinqClient.<SubmitAsync>g__Core|8_0[T](RequestMessage message, PoolGremlinqClient this, CancellationToken ct)+System.Threading.Tasks.Sources.IValueTaskSource<System.Boolean>.GetResult()
   at ExRam.Gremlinq.Providers.Core.GremlinqClientExtensions.LoggingGremlinqClient.<SubmitAsync>g__Core|6_0[TResult](RequestMessage requestMessage, LoggingGremlinqClient this, CancellationToken ct)+MoveNext() in /_/src/Providers.Core/Extensions/GremlinqClientExtensions.cs:line 100

[danielcweber]

I will have a look.

[EliorGigi]

Thanks!
As a temporary workaround, I run queries every hour, and the issue doesn't occur.

[jasonzhang20240304]

Hi I am experiencing very similar issues, it happens while the service is in use

[danielcweber]

Which Gremlinq version?

[jasonzhang20240304]

I am using 12.1.2 at the moment

[danielcweber]

Considered fixed.