Make Conduit's rocksdb_max_open_files parameter configurable, and set it to a higher default value

roles/matrix-conduit/defaults/main.yml

@@ -36,6 +36,11 @@ matrix_conduit_template_conduit_config: "{{ role_path }}/templates/conduit/condu
 # Max size for uploads, in bytes
 matrix_conduit_max_request_size: 20_000_000
 
+# Maximum number of open files for Conduit's embedded RocksDB database
+# See https://github.com/facebook/rocksdb/wiki/RocksDB-Tuning-Guide#tuning-other-options
+# If not specified, Conduit defaults to a relatively low value of 20
+matrix_conduit_rocksdb_max_open_files: 64
+
 # Enables registration. If set to false, no users can register on this server.
 matrix_conduit_allow_registration: false
 

roles/matrix-conduit/templates/conduit/conduit.toml.j2

@@ -34,6 +34,9 @@ port = {{ matrix_conduit_port_number }}
 # Max size for uploads
 max_request_size = {{ matrix_conduit_max_request_size }}
 
+# Max number of open files for the RocksDB database
+rocksdb_max_open_files = {{ matrix_conduit_rocksdb_max_open_files }}
+
 # Enables registration. If set to false, no users can register on this server.
 allow_registration = {{ matrix_conduit_allow_registration | to_json }}