Affects Version/s: None
Fix Version/s: 1.8.0
There was some discussion in
ACCUMULO-4328 about ports, so I decided to track down how the client ports are configured and allocated. Issues raised in the discussion were:
1. The port search feature was not well understood
2. Ephemeral port allocation makes it hard to lock servers down (e.g. iptables)
Looking through the code I found the following properties allocate a port number based on conf.getPort(). This returns the port number based on the property and supports either a single value or zero. Then, in the server component (monitor, tracer, gc, etc) this value is used when creating a ServerSocket. If the port is already in use, the process will fail.
The following properties use TServerUtils.startServer which uses the value in the property to start the TServer. If the value is zero, then it picks a random port between 1024 and 65535. If tserver.port.search is enabled, then it will try a thousand times to bind to a random port.
I'm proposing that we deprecate the tserver.port.search property and the value zero in the property value for the properties above. Instead, I think we should allow the user to specify a single value or a range (M-N).