Github user justinleet commented on a diff in the pull request:
https://github.com/apache/metron/pull/791#discussion_r143058611
--- Diff: metron-platform/metron-enrichment/README.md ---
@@ -25,9 +25,26 @@ defined by JSON documents stored in zookeeper.
There are two types of configurations at the moment, `global` and
`sensor` specific.
+
## Global Configuration
-See the "[Global Configuration](../metron-common)" section.
+There are a few enrichments which have independent configurations, such
+as from the global config.
+
+Also, see the "[Global Configuration](../metron-common)" section for
+more discussion of the global config.
+
+### GeoIP
+Metron supports enrichment of IP information using
+[GeoLite2](https://dev.maxmind.com/geoip/geoip2/geolite2/). The
+location of the file is managed in the global config.
+
+#### `geo.hdfs.file`
+
+The location on HDFS of the GeoLite2 database file to use for GeoIP
+lookups. This file will be localized on the storm supervisors running
+the topology and used from there. If this file changes, a topology
--- End diff --
Topology restart shouldn't be required. In the event of a global config
change `GenericEnrichmentBolt.reloadCallback` calls `GeoAdapter.updateAdapter`
which delegates to `GeoLiteDatabase.INSTANCE.updateIfNecessary`.
---
