Rewrite blob upload to use temporary files

Previously, it was allocating in-memory buffers for upload, which caused it to
run out of memory on large file uploads (or on many small uploads running
simultaneously).

Unfortunately, we don't create the temporary file in the right location (due
to separation of the BlobStore from the ByteStreamServer), so we copy the file
again to write it to the OnDiskBlobStore, which isn't ideal. There'll need to
be another BlobStore API change to make that work, when the InMemoryBlobStore
is gone.

PiperOrigin-RevId: 160974550

0 files changed, 0 insertions, 0 deletions