Github user eolivelli commented on the issue:
https://github.com/apache/zookeeper/pull/227
@ivankelly thanks for taking a look.
I do not have numbers about local transport vs loopback.
The first use case is to run unit tests of applications which use zk
eithout opening ports. Using an ephemeral port may work but it makes trickier
setting up things.
Without opening ports you can run multiple parallel tests easily
The second is to run applications which are made to run both in
'distributed' mode and in single process mode and use zk and other libs,
especially bookkeeper without opening ports.
Opening a port can be seen as a security risk.
For instance I have several apps which use bk as internal wal but I need to
make zk port open at least on loopback interface.
I see that these points can be managed using SO level configs/tricks or
using docker...but I if cut off the network stack if zk and bk at all it will
make packaging of these apps really easy.
I will update the commit message as well
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