The other alternatives specifically for logging are Scribe (which we use here at Facebook) and Apache Flume. As I understand the use case for this software, it

The other alternatives specifically for logging are Scribe (which we use here at Facebook) and Apache Flume. As I understand the use case for this software, it would be talking UDP to a local syslog server, not over the network. At Facebook, we use scribe, and generally use (in-memory, in-app) batched writes to local scribe, and then batched writes (memory+disk, scribe daemon) from that local scribe to an upstream scribe storage system.