Add index cache max-async-concurrency (50 to 3)

Signed-off-by: SungJin1212 <[email protected]>

Author: SungJin1212

docs/blocks-storage/querier.md

@@ -794,7 +794,7 @@ blocks_storage:
         # The maximum number of concurrent asynchronous operations can occur
         # when backfilling cache items.
         # CLI flag: -blocks-storage.bucket-store.index-cache.multilevel.max-async-concurrency
-        [max_async_concurrency: <int> | default = 50]
+        [max_async_concurrency: <int> | default = 3]
 
         # The maximum number of enqueued asynchronous operations allowed when
         # backfilling cache items.

docs/blocks-storage/store-gateway.md

@@ -891,7 +891,7 @@ blocks_storage:
         # The maximum number of concurrent asynchronous operations can occur
         # when backfilling cache items.
         # CLI flag: -blocks-storage.bucket-store.index-cache.multilevel.max-async-concurrency
-        [max_async_concurrency: <int> | default = 50]
+        [max_async_concurrency: <int> | default = 3]
 
         # The maximum number of enqueued asynchronous operations allowed when
         # backfilling cache items.

docs/configuration/config-file-reference.md

@@ -1327,7 +1327,7 @@ bucket_store:
       # The maximum number of concurrent asynchronous operations can occur when
       # backfilling cache items.
       # CLI flag: -blocks-storage.bucket-store.index-cache.multilevel.max-async-concurrency
-      [max_async_concurrency: <int> | default = 50]
+      [max_async_concurrency: <int> | default = 3]
 
       # The maximum number of enqueued asynchronous operations allowed when
       # backfilling cache items.

pkg/storage/tsdb/index_cache.go

@@ -132,7 +132,7 @@ func (cfg *MultiLevelIndexCacheConfig) Validate() error {
 }
 
 func (cfg *MultiLevelIndexCacheConfig) RegisterFlagsWithPrefix(f *flag.FlagSet, prefix string) {
-	f.IntVar(&cfg.MaxAsyncConcurrency, prefix+"max-async-concurrency", 50, "The maximum number of concurrent asynchronous operations can occur when backfilling cache items.")
+	f.IntVar(&cfg.MaxAsyncConcurrency, prefix+"max-async-concurrency", 3, "The maximum number of concurrent asynchronous operations can occur when backfilling cache items.")
 	f.IntVar(&cfg.MaxAsyncBufferSize, prefix+"max-async-buffer-size", 10000, "The maximum number of enqueued asynchronous operations allowed when backfilling cache items.")
 	f.IntVar(&cfg.MaxBackfillItems, prefix+"max-backfill-items", 10000, "The maximum number of items to backfill per asynchronous operation.")
 }