Profile() Step Fails in Gremlin Javascript (Graph Binary)

[Steve A.]

The profile() traversal step always throws the following error in AWS Neptune using Graph Binary serialization.

node_modules/gremlin/lib/structure/io/binary/internals/AnySerializer.js:92      

 throw this.ioc.utils.des_error({ serializer: this, args: arguments, err });       ^  Error: AnySerializer.deserialize(cursor=090000000001210000000000000000012d000000000058dd00b8000000102c00...): ArraySerializer.deserialize(cursor=210000000000000000012d000000000058dd00b8000000102c0000000007302e...): {item_0}: AnySerializer.deserialize(cursor=210000000000000000012d000000000058dd00b8000000102c0000000007302e...): TraverserSerializer.deserialize(cursor=2d000000000058dd00b8000000102c0000000007302e302e3028290000000f49...): {value}: AnySerializer.deserialize(cursor=2d000000000058dd00b8000000102c0000000007302e302e3028290000000f49...): unknown {type_code}.     at AnySerializer.deserialize (dir/node_modules/gremlin/lib/structure/io/binary/internals/AnySerializer.js:87:15)     at TraverserSerializer.deserialize (dir/node_modules/gremlin/lib/structure/io/binary/internals/TraverserSerializer.js:109:64)     at AnySerializer.deserialize (dir/node_modules/gremlin/lib/structure/io/binary/internals/AnySerializer.js:90:25)     at ArraySerializer.deserialize (dir/node_modules/gremlin/lib/structure/io/binary/internals/ArraySerializer.js:120:66)     at AnySerializer.deserialize (dir/node_modules/gremlin/lib/structure/io/binary/internals/AnySerializer.js:90:25)     at GraphBinaryReader.readResponse (dir/node_modules/gremlin/lib/structure/io/binary/internals/GraphBinaryReader.js:76:59)     at Connection._handleMessage (dir/node_modules/gremlin/lib/driver/connection.js:296:35)     at WebSocket.<anonymous> (dir/guide/node_modules/gremlin/lib/driver/connection.js:141:43)     at WebSocket.emit (node:events:518:28)     at Receiver.receiverOnMessage (dir/node_modules/ws/lib/websocket.js:1220:20)

Is this a bytecode or AWS Neptune issue? Has the profile() step been deprecated?

[Stephen Mallette]

With Neptune you must prefer use of the /profile API over the profile() step (with similar advice for explain()):

https://docs.aws.amazon.com/neptune/latest/userguide/gremlin-explain-api.html

https://docs.aws.amazon.com/neptune/latest/userguide/gremlin-profile-api.html

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[Steve A.]

Why does this work for GraphJSON but not GraphBinary serialization?

[Stephen Mallette]

I probably should have provided a few more words of context in my first reply. I won't focus on the error  itself too much, because despite sending a response, Neptune essentially does not support the TinkerPop profile() and explain() steps. If you look at the difference in output between what you get in GraphSON or say Gremlin Console, you will note that there is a lot more information provided in the /profile and /explain endpoints. You should simply use those for Neptune. 

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