[jira] [Commented] (TINKERPOP-2767) Repeat Out Times traversal hangs indefinitely on first execution

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/TINKERPOP-2767?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17683607#comment-17683607 ] 

ASF GitHub Bot commented on TINKERPOP-2767:
-------------------------------------------

xiazcy commented on PR #1946:
URL: https://github.com/apache/tinkerpop/pull/1946#issuecomment-1414555247

   I think there is the question of do we want to send all of the error messages to the client? I feel like we should handle the hanging in the driver, but it may not be necessary to dump all stack trace?




> Repeat Out Times traversal hangs indefinitely on first execution
> ----------------------------------------------------------------
>
>                 Key: TINKERPOP-2767
>                 URL: https://issues.apache.org/jira/browse/TINKERPOP-2767
>             Project: TinkerPop
>          Issue Type: Bug
>          Components: server
>    Affects Versions: 3.5.3
>         Environment: Windows 10
>            Reporter: Simon Zhao
>            Priority: Major
>
> Originally encountered when fixing TINKERPOP-2754
>  
> The following traversal in JS seems to cause hanging the first time you run it on a newly launched gremlin-server (3.5.3) via docker
>  
> {{await g.V('1').repeat(_.out()).times(1500).next();}}
>  
> The same hanging occurs in gremlin-go. 
>  
> {code:java}
> _, err = g.With("evaluationTimeout", 1000).V("1").Repeat(gremlingo.T__.Out()).Times(int32(1500)).Next() {code}
>  
> The timeout is optional, but indicates that something is going wrong since it is not returning. Interestingly enough, if the timeout is very low, then it won't hang because it will say the timeout was exceeded. This indicates that if the traversal is completed within the timeout, it's just not returning for some reason on the first call.
>  
> If you were to write a script and invoke this snippet of code, it will hang. If you forcefully terminate the script and rerun it, then it doesn't hang.
>  
> main.go
> {code:java}
> package main
> import (
>    gremlingo "github.com/apache/tinkerpop/gremlin-go/v3/driver"
>    "log"
> )
> func main() {
>    driver, err := gremlingo.NewDriverRemoteConnection("ws://localhost:45940/gremlin")
>    if err != nil {
>       log.Print("Err creating DRC")
>       return
>    }
>    defer driver.Close()
>    log.Println("Start")
>    g := gremlingo.Traversal_().WithRemote(driver)
>    LABEL := "test"
>    _, err = g.V().HasLabel(LABEL).Drop().Next()
>    _, err = g.AddV(LABEL).Property(gremlingo.T.Id, "1").Next()
>    _, err = g.AddV(LABEL).Property(gremlingo.T.Id, "2").Next()
>    _, err = g.AddE(LABEL).From(gremlingo.T__.V("1")).To(gremlingo.T__.V("2")).Property(gremlingo.T.Id, "e1").Next()
>    _, err = g.AddE(LABEL).From(gremlingo.T__.V("2")).To(gremlingo.T__.V("1")).Property(gremlingo.T.Id, "e2").Next()
>    if err != nil {
>       log.Println("Error during setup")
>       return
>    }
>    log.Println("Start the problematic traversal")
>    _, err = g.With("evaluationTimeout", 1000).V("1").Repeat(gremlingo.T__.Out()).Times(int32(1500)).Next()
>    if err != nil {
>       log.Println("Error with the problematic traversal, but we didn't hang")
>       return
>    }
>    log.Println("End")
> } {code}



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