storage: document memory issues with multiple concurrent writes
Fixes
@@ -48,8 +48,11 @@ type Writer struct {
// to the nearest multiple of 256K. If zero, chunking will be disabled and
// the object will be uploaded in a single request.
//
- // ChunkSize will default to a reasonable value. Any custom configuration
- // must be done before the first Write call.
+ // ChunkSize will default to a reasonable value. If you perform many concurrent
+ // writes of small objects, you may wish set ChunkSize to a value that matches
+ // your objects' sizes to avoid consuming large amounts of memory.
+ //
+ // ChunkSize must be set before the first Write call.
ChunkSize int
// ProgressFunc can be used to monitor the progress of a large write.
