Test Gremlin code in the context where you will deploy it

In Gremlin, there are multiple ways for clients to submit queries to the server: using WebSocket, or Bytecode GLV, or through the Gremlin console using string-based scripts.

It is important to recognize that Gremlin query execution can differ depending on how you submit the query. A query that returns an empty result might be treated as having succeeded if submitted in Bytecode mode, but be treated as having failed if submitted in script mode. For example, if you include next() in a script-mode query, the next() is sent to the server, but using ByteCode the client usually processes the next() itself. In the first case, the query fails if no results are found, but in the second, the query succeeds whether or not the result set is empty.

If you develop and test your code in one context (for example, the Gremlin console which generally submits queries in text form), but then deploy your code in a different context (for example through the Java driver using Bytecode) you can run into problems where your code behaves differently in production than it did in your development environment.

Important

Be sure to test Gremlin code in the GLV context where it will be deployed, to avoid unexpected results.