[TINKERPOP-1726] Support WebSockets ping/pong keep-alive in Gremlin server

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.2.5
• Fix Version/s: 3.2.8, 3.3.2
• Component/s: server
• External issue URL: https://groups.google.com/forum/#!msg/gremlin-users/KS4UOcbSjhg/NdB2e7VLAgAJ
• Assignee: Stephen Mallette
• Reporter: Andy Davidoff
• Created: 12/Jul/17 18:10
• Updated: 23/Feb/18 12:42
• Resolved: 23/Feb/18 12:42

Description

The ping/pong keep-alive system that is part of the WebSockets spec provides for successful identification of a dropped connection from either end of the connection.

Currently, the Java client successfully issues keep-alive pings and receives pong replies from the server. Unfortunately, the server does not actively ping clients, nor does it discover and react to dead clients when keep-alive fails.

This can cause pending client writes to lock up the server indefinitely when a client spontaneously disconnects.

Issue Links

• links to: GitHub Pull Request #800