Github user spmallette commented on the issue:
https://github.com/apache/tinkerpop/pull/567
I like this way better than the synchronization. I have some reservations
about:
```java
CompletableFuture.supplyAsync(() -> loader.parseClass(script,
generateScriptName()));
```
That's going to use the `ForkJoinPool` to execute the compilation, which is
a shared thread pool for the JVM that isn't configurable and basically outside
of our control. Of course, getting rid of it means adding a new
`ExecutorService` that we can configure and monitor in
`GremlinGroovyScriptEngine`. Making that kind of change goes pretty deep into
various aspects of TinkerPop. If @BrynCooke is ok with the changes I can merge
what he has to a branch since it seems like we have general consensus on the
approach and then make some additional changes and re-issue the PR for a final
VOTE. If there's no objections I'll start work on that first thing tomorrow.
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