[#661] blobovniczatree: Make Rebuild concurrent

Different DBs can be rebuild concurrently.

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

config/example/node.env

@@ -92,6 +92,7 @@ FROSTFS_OBJECT_DELETE_TOMBSTONE_LIFETIME=10
 # Storage engine section
 FROSTFS_STORAGE_SHARD_POOL_SIZE=15
 FROSTFS_STORAGE_SHARD_RO_ERROR_THRESHOLD=100
+FROSTFS_STORAGE_REBUILD_WORKERS_COUNT=1000
 ## 0 shard
 ### Flag to refill Metabase from BlobStor
 FROSTFS_STORAGE_SHARD_0_RESYNC_METABASE=false

config/example/node.json

@@ -137,6 +137,7 @@
   "storage": {
     "shard_pool_size": 15,
     "shard_ro_error_threshold": 100,
+    "rebuild_workers_count": 1000,
     "shard": {
       "0": {
         "mode": "read-only",

config/example/node.yaml

@@ -116,6 +116,7 @@ storage:
   # note: shard configuration can be omitted for relay node (see `node.relay`)
   shard_pool_size: 15 # size of per-shard worker pools used for PUT operations
   shard_ro_error_threshold: 100 # amount of errors to occur before shard is made read-only (default: 0, ignore errors)
+  rebuild_workers_count: 1000 # count of rebuild storage concurrent workers
 
   shard:
     default: # section with the default shard parameters