module Nn_state: sig .. end
State manager: Provide the logical view of the state, and forward changes
to the database and to the nameslaves (2-phase commit)
type Plasma_util.errno
exception Transaction_error of errno
type
val create_owner : unit -> owner
val string_of_owner : owner -> string
class type shared_state_t = object .. end
This object exists once in the nn_master container, and collects
information from not yet committed views (such as which ID's are
used), so that the views can avoid clashes between each other.
type
The shm part of shared_state_t. This type is marshallable.
type Nn_db.modification Queue.t
A journal is a queue of database modifications. Journals are the
entities that are sent to the slaves
class type view_t = object .. end
A view is a high-level transaction, involving both the local db and
the slaves
class type ds_view_t = object .. end
View on datastore state
class type bm_view_t = object .. end
View on blockmap state:
class type inode_view_t = object .. end
The following classes are used as follows: First, a
shared_state
is created. This object is passed on as arguments to the view
objects. The views, if all connected with the same
shared_state,
can be committed in one go (in
Nn_commit).
val sh_state_shm : Netmcore.res_id -> int -> string -> sh_state_shm
class shared_state : Unixqueue.event_system -> Nn_config.nn_node_config -> Pfs_auth.client_auth -> sh_state_shm -> shared_state_t
class ds_view : shared_state_t -> ds_view_t
class bm_view : shared_state_t -> bm_view_t
class inode_view : shared_state_t -> inode_view_t
val encap_time : float -> Pfs_rpcapi_aux.time
Turn the time (as seconds since epoch) into the RPC version
