Support for Apache HTTP Server in SAS® Viya® 3.5

Support for Apache HTTP Server

Apache HTTP Server provides security and load balancing for multiple SAS Viya components. It is included with SAS Viya on Windows. On Linux, it is installed as an RPM dependency with SAS Viya if you do not install the software yourself ahead of time.

SAS Viya supports the following versions of Apache HTTP Server:

  • Red Hat Linux 6.x uses Apache HTTP Server v2.2.
  • Red Hat Linux 7.x uses Apache HTTP Server v2.4.
  • SUSE Linux Enterprise Server 12.x uses Apache HTTP Server v2.4.

SAS Viya on Windows ships with Apache HTTP Server v2.4.34.

Apache HTTP Server version 2.4.39 contains a bug: no default is defined for the ReadRequestTimeout parameter. The missing default can cause failures when you attempt to import large amounts of data from a web browser, as when you use SAS Environment Manager to import data from a Quality Knowledge Base.

SAS has investigated this issue and expects a fix in the next version of Apache. In the meantime, on the machines in your deployment where Apache is installed, you can modify the /etc/httpd/httpd.conf file to set the default timeout: 

RequestReadTimeout handshake=0 header=20-40,MinRate=500 body=20,MinRate=500

Be sure to restart Apache to pick up the change.


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