Is it possible to use GeoMesa Accumulo as a Geoserver Data store for real time data? i.e. Can Geoserver be configured to frequently read the data from Accumulo and update the layer?
For such real time applications, it is more typical to use the GeoMesa Kafka DataStore. This capability can maintain the most up-to-date information from a sensor or other updating entity. Messages about the new information are passed via Kafka.
In GeoServer, the consumer maintains an in-memory database of the current state. Since everything is in-memory, polling a GeoServer layer backed by a Kakfa DataStore is nice and quick.
For applications which require both historical and real time views, data can be written to both Accumulo (or HBase/C*) and Kafka. The application can delegate historical requests to the bigger, distributed databases, and current/live queries can be made against the Kafka DataStore.