Can I setup two Fuseki instances using the same database directory?

Question

I need to have a public read only instance to query data using the port 3030 and a private read and write instance to add and update data using the port 3031. Both instances are only accessible throw a web server using distinct domains and port 80. Also, the private instance provides access using an HTTP user/password.

My question is about concurrency: Has Fuseki support to concurrently access to a directory database using two server instances?

Answer 1

I found the answer in the Fuseki documentation:

Multiple applications, running in multiple JVMs, using the same file databases is not supported. There must be a single JVM controlling the database directory and files.

Use Fuseki to provide a database server for multiple applications. Fuseki supports SPARQL Query, SPARQL Update and the SPARQL Graph Store protocol.

So, the answer is that multiple instances using the same database are not supported.