[#1024] shard: Resync metabase concurrently

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

config/example/node.env

@@ -98,6 +98,7 @@ FROSTFS_STORAGE_REBUILD_WORKERS_COUNT=1000
 ## 0 shard
 ### Flag to refill Metabase from BlobStor
 FROSTFS_STORAGE_SHARD_0_RESYNC_METABASE=false
+FROSTFS_STORAGE_SHARD_0_RESYNC_METABASE_WORKER_COUNT=100
 ### Flag to set shard mode
 FROSTFS_STORAGE_SHARD_0_MODE=read-only
 ### Write cache config

config/example/node.json

@@ -144,6 +144,7 @@
       "0": {
         "mode": "read-only",
         "resync_metabase": false,
+        "resync_metabase_worker_count": 100,
         "writecache": {
           "enabled": false,
           "no_sync": true,

config/example/node.yaml

@@ -167,6 +167,7 @@ storage:
         # degraded-read-only
         # disabled (do not work with the shard, allows to not remove it from the config)
       resync_metabase: false  # sync metabase with blobstor on start, expensive, leave false until complete understanding
+      resync_metabase_worker_count: 100
 
       writecache:
         enabled: false