Class type Nn_state.bm_view_t

class type bm_view_t = object .. end

View on blockmap state:

Inherits

Nn_state.view_t

method release : unit -> unit

Release the pinned blocks

method blockmap_get_e : identity:string -> Nn_blockmap.blockmap_t Uq_engines.engine

Get the contents of the blockalloc table for this datastore identity, wrapped into a blockmap_t object

method blockmap_alloc_e : inode:int64 ->
       rpolicy:Nn_alloc_types.rpolicy ->
       index:int64 ->
       number:int ->
       pref:string list ->
       Nn_alloc_types.transacted_datastores ->
       Nn_blockmap.reserve_info -> Nn_blocklist.blocklist Uq_engines.engine

Reserve blocks and allocate at commit time. index is the first index number to use in the returned list of blocks, index+number-1 is the last index number. For each index blocks are allocated on the datanodes according to rpolicy (usually with replicas). At reservation time, only the blockmap is updated; at commit time the blockalloc database table. The blocks are not associated with inodes yet.

pref: list of preferred datanodes, given as identity strings.

reserve_info: gives hints where to allocate blocks

method blockmap_allocsize : int

Returns the allocation size

method blockmap_dealloc_e : inode:int64 -> (string * int64 * int64) list -> unit Uq_engines.engine

Mark blocks and deallocate at commit time. The passed list consists of pairs (identity,block,number).

method blockmap_load_e : unit -> unit Uq_engines.engine

Ensures that all known blockmaps are loaded

method blockmap_pin : inode:int64 -> (string * int64 * int64) list -> unit

Pin these blocks until commit/rollback. It is required that the maps were loaded first (blockmap_load_e).

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