R v4.0.0 client gets stuck

h2oai / h2o-3

H2O is an Open Source, Distributed, Fast & Scalable Machine Learning Platform: Deep Learning, Gradient Boosting (GBM) & XGBoost, Random Forest, Generalized Linear Modeling (GLM with Elastic Net), K-Means, PCA, Generalized Additive Models (GAM), RuleFit, Support Vector Machine (SVM), Stacked Ensembles, Automatic Machine Learning (AutoML), etc.

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After some time (~ couple thousand rapid calls) it got stuck. From wireshark, I was able to determine that R for some reason switches to IPv6 (see the attached screenshot) and gets stuck. The following h2o.init(ip = "127.0.0.1") appears to mitigate this issue.

This issue happened on macOS 10.15.5. /etc/hosts contains both 127.0.0.1 and ::1 as localhost.

I was able to replicate this on the same system with R 3.3.3 and 4.0.2 which leads me to believe that it might be an issue with RCurl.

{quote}> RCurl::curlVersion() $age [1] 4

$version [1] "7.64.1"

$vesion_num [1] 475137

$host [1] "x86_64-apple-darwin19.0"

$features ipv6 ssl libz ntlm asynchdns spnego largefile ntlm_wb 1 4 8 16 128 256 512 32768

$ssl_version [1] "(SecureTransport) LibreSSL/2.8.3"

$ssl_version_num [1] 0

$libz_version [1] "1.2.11"

$protocols [1] "dict" "file" "ftp" "ftps" "gopher" "http" "https" "imap" "imaps" [10] "ldap" "ldaps" "pop3" "pop3s" "rtsp" "smb" "smbs" "smtp" "smtps" [19] "telnet" "tftp"

$ares [1] ""

$ares_num [1] 0

$libidn [1] ""{quote}

!Screenshot 2020-07-07 at 17.12.16.png|thumbnail!

h2oai / h2o-3

R v4.0.0 client gets stuck #7965