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AWS Neptune and gremlin-javascript versions

DCDragos Ciupureanu
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11/12/2023
Hi, I'm using the js gremlin client 3.6.2 with AWS Neptune version 1.2.1.0 and I get the following error when trying to upsert nodes with mergeV() 
ResponseError: Server error: {"code":"InternalFailureException","requestId":"aa89ee40-74d5-46c1-9ad5-0bc3f2fde5c1","detailedMessage":"null: .option(LinkedHashMap, LinkedHashMap)","message":"null: .option(LinkedHashMap, LinkedHashMap)"} (599)
ResponseError: Server error: {"code":"InternalFailureException","requestId":"aa89ee40-74d5-46c1-9ad5-0bc3f2fde5c1","detailedMessage":"null: .option(LinkedHashMap, LinkedHashMap)","message":"null: .option(LinkedHashMap, LinkedHashMap)"} (599)
The code I'm writing is 
const {
    t: { id, label }
} = gremlin.process;

const idMap = new Map([[id, entity.id]]);
const createMap = new Map([
            [label, 'my_vertex'],
            ['prop1', entity.prop1 || '']
        ]);
const updateMap = new Map([
            ['prop1', entity.prop1 || '']
        ]);
return g
       .mergeV(idMap)
       .option(onCreate, createMap)
       .option(onMatch, __.sideEffect(__.property(cardinality.single, updateMap)).constant(new Map()));
const {
    t: { id, label }
} = gremlin.process;

const idMap = new Map([[id, entity.id]]);
const createMap = new Map([
            [label, 'my_vertex'],
            ['prop1', entity.prop1 || '']
        ]);
const updateMap = new Map([
            ['prop1', entity.prop1 || '']
        ]);
return g
       .mergeV(idMap)
       .option(onCreate, createMap)
       .option(onMatch, __.sideEffect(__.property(cardinality.single, updateMap)).constant(new Map()));
I've tried with an object instead of a map, but no luck. The only solution I've found is to use the gremlin-javascript@3.7.0 which seems to work with the above code correctly, but I'm concerned about the client being too new for the server. My question is: does the version of the javascript client match the version of the server (or should it)? Or should I always strive to use the latest client?
Solution:
That's a strange error because the error seems to indicate that option() is being called with two Map arguments, but your example does not seem to indicate that you are doing that. It's interesting that 3.7.0 "fixes" it because I can't think of any reason why that would matter. Perhaps you could try 3.6.5 to see if there were somehow changes after 3.6.2 that solved this problem? Regarding your more general question of:
My question is: does the version of the javascript client match the version of the server (or should it)? Or should I always strive to use the latest client?
Generally speaking you should follow the version table here https://docs.aws.amazon.com/neptune/latest/userguide/access-graph-gremlin-client.html - While it is possible that versions outside of those ranges in that table will work with one another, those are the versions that Neptune tests against and that are supported....
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Solution
Sspmallette
View on Discord
11/13/2023
That's a strange error because the error seems to indicate that option() is being called with two Map arguments, but your example does not seem to indicate that you are doing that. It's interesting that 3.7.0 "fixes" it because I can't think of any reason why that would matter. Perhaps you could try 3.6.5 to see if there were somehow changes after 3.6.2 that solved this problem? Regarding your more general question of:
My question is: does the version of the javascript client match the version of the server (or should it)? Or should I always strive to use the latest client?
Generally speaking you should follow the version table here https://docs.aws.amazon.com/neptune/latest/userguide/access-graph-gremlin-client.html - While it is possible that versions outside of those ranges in that table will work with one another, those are the versions that Neptune tests against and that are supported.
DCDragos Ciupureanu
View on Discord
11/14/2023
Thanks for pointing out that versions table (I didn't actually check the Java page...). I'll give it a go with 3.6.5 and see if it works or not.

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