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https://issues.apache.org/jira/browse/TINKERPOP-887?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15622708#comment-15622708
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ASF GitHub Bot commented on TINKERPOP-887:
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Github user dkuppitz commented on the issue:
https://github.com/apache/tinkerpop/pull/470
Interesting. I've had different results in myy benchmark and it looked more
like just a lot of noise in the measurements, since Bryn's branch was sometimes
a bit faster. There's a crazy difference between the 2 results of
`h.V().out().out().out().toSet()`, but the others look okay to me.
> When is it NOT obvious?
It is not obvious for the actual users of TinkerPop. Applications throw
exceptions and users have no idea where they need to fix their application.
> FastNoSuchElementException hides stack trace in client code
> -----------------------------------------------------------
>
> Key: TINKERPOP-887
> URL: https://issues.apache.org/jira/browse/TINKERPOP-887
> Project: TinkerPop
> Issue Type: Improvement
> Components: process
> Affects Versions: 3.0.2-incubating
> Reporter: Bryn Cooke
> Assignee: Marko A. Rodriguez
> Priority: Minor
>
> I wrote some code that incorrectly assumed that a Gremlin query would return
> an element, but it didn't. The surprise was that I got no stack trace and
> therefore had no idea where in *my* code I had introduced the error.
> I haven't looked in detail at the TP code, so what comes next is speculation:
> If FastNoSuchElementException is being used in truly exceptional
> circumstances then why is a singleton is used over a normal exception with
> stack trace? It could just as easily be converted to a normal exception.
> If FastNoSuchElementException is being used for control flow then probably it
> shouldn't. Code should check hasNext rather than trying for next and dealing
> with an exceptional result. I'm not sure what the current state of things are
> in the JVM but at least in the past try catch blocks would inhibit
> optimization even without stack traces so this type of code was considered an
> antipattern.
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