gsutil consuming large amounts of memory during downloads of large files

While downloading a large file to local storage on a GKE (Kubernetes) PVC (ssd), we noticed the `gsutil` process causing the containers to be killed on a regular basis.

The container is limited to 24 GiB of RAM use, which _should_ be fine to download a 230GiB file. It isn't, as sometimes the `gsutil` process grows way beyond this.

It's noteworthy that apparently storage sometimes can't keep up, which might cause `gsutil` to buffer the data without providing any back pressure in form of bandwidth managing or pausing and resuming the incoming data transfer.

Example session in mid transfer:

```
# gsutil -v
gsutil version: 4.28
# ps afux
root 407 0.0 0.0 111188 66936 ? S 12:53 0:00 \_ python2 /usr/bin/../lib/google-cloud-sdk/bin/bootstrapping/gsutil.py cp gs://examplebucket/examplefile-230GiB.tar.zst /data/mysql/tmp/restore.tar.zst
root 412 4.3 0.0 305116 34780 ? Sl 12:53 1:56 \_ /usr/bin/python2 /usr/lib/google-cloud-sdk/platform/gsutil/gsutil -o GSUtil:default_project_id=shopify-tiers cp gs://examplebucket/examplefile-230GiB.tar.zst /data/mysql/tmp/restore.tar.zst
root 416 0.0 0.0 570092 25928 ? Sl 12:53 0:00 \_ /usr/bin/python2 /usr/lib/google-cloud-sdk/platform/gsutil/gsutil -o GSUtil:default_project_id=shopify-tiers cp gs://examplebucket/examplefile-230GiB.tar.zst /data/mysql/tmp/restore.tar.zst
root 417 9.2 0.0 12020364 31872 ? Sl 12:53 4:08 \_ /usr/bin/python2 /usr/lib/google-cloud-sdk/platform/gsutil/gsutil -o GSUtil:default_project_id=shopify-tiers cp gs://examplebucket/examplefile-230GiB.tar.zst /data/mysql/tmp/restore.tar.zst
root 527 201 0.0 452068 34824 ? Sl 12:53 90:41 \_ /usr/bin/python2 /usr/lib/google-cloud-sdk/platform/gsutil/gsutil -o GSUtil:default_project_id=shopify-tiers cp gs://examplebucket/examplefile-230GiB.tar.zst /data/mysql/tmp/restore.tar.zst
root 528 0.0 0.0 451812 29856 ? Sl 12:53 0:00 \_ /usr/bin/python2 /usr/lib/google-cloud-sdk/platform/gsutil/gsutil -o GSUtil:default_project_id=shopify-tiers cp gs://examplebucket/examplefile-230GiB.tar.zst /data/mysql/tmp/restore.tar.zst
root 529 0.0 0.0 451812 29856 ? Sl 12:53 0:00 \_ /usr/bin/python2 /usr/lib/google-cloud-sdk/platform/gsutil/gsutil -o GSUtil:default_project_id=shopify-tiers cp gs://examplebucket/examplefile-230GiB.tar.zst /data/mysql/tmp/restore.tar.zst
root 531 0.0 0.0 451812 29856 ? Sl 12:53 0:00 \_ /usr/bin/python2 /usr/lib/google-cloud-sdk/platform/gsutil/gsutil -o GSUtil:default_project_id=shopify-tiers cp gs://examplebucket/examplefile-230GiB.tar.zst /data/mysql/tmp/restore.tar.zst
root 533 0.0 0.0 451812 29856 ? Sl 12:53 0:00 \_ /usr/bin/python2 /usr/lib/google-cloud-sdk/platform/gsutil/gsutil -o GSUtil:default_project_id=shopify-tiers cp gs://examplebucket/examplefile-230GiB.tar.zst /data/mysql/tmp/restore.tar.zst
root 534 0.0 0.0 451812 29856 ? Sl 12:53 0:00 \_ /usr/bin/python2 /usr/lib/google-cloud-sdk/platform/gsutil/gsutil -o GSUtil:default_project_id=shopify-tiers cp gs://examplebucket/examplefile-230GiB.tar.zst /data/mysql/tmp/restore.tar.zst
root 536 0.0 0.0 451812 29864 ? Sl 12:53 0:00 \_ /usr/bin/python2 /usr/lib/google-cloud-sdk/platform/gsutil/gsutil -o GSUtil:default_project_id=shopify-tiers cp gs://examplebucket/examplefile-230GiB.tar.zst /data/mysql/tmp/restore.tar.zst
root 538 0.0 0.0 451812 29868 ? Sl 12:53 0:00 \_ /usr/bin/python2 /usr/lib/google-cloud-sdk/platform/gsutil/gsutil -o GSUtil:default_project_id=shopify-tiers cp gs://examplebucket/examplefile-230GiB.tar.zst /data/mysql/tmp/restore.tar.zst
root 541 0.0 0.0 451812 29868 ? Sl 12:53 0:00 \_ /usr/bin/python2 /usr/lib/google-cloud-sdk/platform/gsutil/gsutil -o GSUtil:default_project_id=shopify-tiers cp gs://examplebucket/examplefile-230GiB.tar.zst /data/mysql/tmp/restore.tar.zst
root 542 0.0 0.0 451812 29872 ? Sl 12:53 0:00 \_ /usr/bin/python2 /usr/lib/google-cloud-sdk/platform/gsutil/gsutil -o GSUtil:default_project_id=shopify-tiers cp gs://examplebucket/examplefile-230GiB.tar.zst /data/mysql/tmp/restore.tar.zst
root 545 0.0 0.0 451812 29876 ? Sl 12:53 0:00 \_ /usr/bin/python2 /usr/lib/google-cloud-sdk/platform/gsutil/gsutil -o GSUtil:default_project_id=shopify-tiers cp gs://examplebucket/examplefile-230GiB.tar.zst /data/mysql/tmp/restore.tar.zst
root 547 0.0 0.0 451812 29876 ? Sl 12:53 0:00 \_ /usr/bin/python2 /usr/lib/google-cloud-sdk/platform/gsutil/gsutil -o GSUtil:default_project_id=shopify-tiers cp gs://examplebucket/examplefile-230GiB.tar.zst /data/mysql/tmp/restore.tar.zst
root 550 0.0 0.0 451812 29884 ? Sl 12:53 0:00 \_ /usr/bin/python2 /usr/lib/google-cloud-sdk/platform/gsutil/gsutil -o GSUtil:default_project_id=shopify-tiers cp gs://examplebucket/examplefile-230GiB.tar.zst /data/mysql/tmp/restore.tar.zst
root 552 0.0 0.0 451812 29884 ? Sl 12:53 0:00 \_ /usr/bin/python2 /usr/lib/google-cloud-sdk/platform/gsutil/gsutil -o GSUtil:default_project_id=shopify-tiers cp gs://examplebucket/examplefile-230GiB.tar.zst /data/mysql/tmp/restore.tar.zst
root 554 0.0 0.0 451944 29884 ? Sl 12:53 0:00 \_ /usr/bin/python2 /usr/lib/google-cloud-sdk/platform/gsutil/gsutil -o GSUtil:default_project_id=shopify-tiers cp gs://examplebucket/examplefile-230GiB.tar.zst /data/mysql/tmp/restore.tar.zst
root 557 0.0 0.0 451944 29888 ? Sl 12:53 0:00 \_ /usr/bin/python2 /usr/lib/google-cloud-sdk/platform/gsutil/gsutil -o GSUtil:default_project_id=shopify-tiers cp gs://examplebucket/examplefile-230GiB.tar.zst /data/mysql/tmp/restore.tar.zst
root 560 0.0 0.0 451944 29888 ? Sl 12:53 0:00 \_ /usr/bin/python2 /usr/lib/google-cloud-sdk/platform/gsutil/gsutil -o GSUtil:default_project_id=shopify-tiers cp gs://examplebucket/examplefile-230GiB.tar.zst /data/mysql/tmp/restore.tar.zst
root 561 0.0 0.0 451944 29892 ? Sl 12:53 0:00 \_ /usr/bin/python2 /usr/lib/google-cloud-sdk/platform/gsutil/gsutil -o GSUtil:default_project_id=shopify-tiers cp gs://examplebucket/examplefile-230GiB.tar.zst /data/mysql/tmp/restore.tar.zst
root 563 0.0 0.0 451944 29892 ? Sl 12:53 0:00 \_ /usr/bin/python2 /usr/lib/google-cloud-sdk/platform/gsutil/gsutil -o GSUtil:default_project_id=shopify-tiers cp gs://examplebucket/examplefile-230GiB.tar.zst /data/mysql/tmp/restore.tar.zst
root 566 0.0 0.0 451944 29892 ? Sl 12:53 0:00 \_ /usr/bin/python2 /usr/lib/google-cloud-sdk/platform/gsutil/gsutil -o GSUtil:default_project_id=shopify-tiers cp gs://examplebucket/examplefile-230GiB.tar.zst /data/mysql/tmp/restore.tar.zst
root 569 0.0 0.0 451944 29896 ? Sl 12:53 0:00 \_ /usr/bin/python2 /usr/lib/google-cloud-sdk/platform/gsutil/gsutil -o GSUtil:default_project_id=shopify-tiers cp gs://examplebucket/examplefile-230GiB.tar.zst /data/mysql/tmp/restore.tar.zst
root 572 0.0 0.0 451944 29896 ? Sl 12:53 0:00 \_ /usr/bin/python2 /usr/lib/google-cloud-sdk/platform/gsutil/gsutil -o GSUtil:default_project_id=shopify-tiers cp gs://examplebucket/examplefile-230GiB.tar.zst /data/mysql/tmp/restore.tar.zst
root 575 0.0 0.0 451944 29900 ? Sl 12:53 0:00 \_ /usr/bin/python2 /usr/lib/google-cloud-sdk/platform/gsutil/gsutil -o GSUtil:default_project_id=shopify-tiers cp gs://examplebucket/examplefile-230GiB.tar.zst /data/mysql/tmp/restore.tar.zst
root 578 0.0 0.0 451944 29888 ? Sl 12:53 0:00 \_ /usr/bin/python2 /usr/lib/google-cloud-sdk/platform/gsutil/gsutil -o GSUtil:default_project_id=shopify-tiers cp gs://examplebucket/examplefile-230GiB.tar.zst /data/mysql/tmp/restore.tar.zst
root 582 0.0 0.0 451944 29904 ? Sl 12:53 0:00 \_ /usr/bin/python2 /usr/lib/google-cloud-sdk/platform/gsutil/gsutil -o GSUtil:default_project_id=shopify-tiers cp gs://examplebucket/examplefile-230GiB.tar.zst /data/mysql/tmp/restore.tar.zst
root 585 0.0 0.0 451944 29896 ? Sl 12:53 0:00 \_ /usr/bin/python2 /usr/lib/google-cloud-sdk/platform/gsutil/gsutil -o GSUtil:default_project_id=shopify-tiers cp gs://examplebucket/examplefile-230GiB.tar.zst /data/mysql/tmp/restore.tar.zst
root 586 0.0 0.0 451944 29776 ? Sl 12:53 0:00 \_ /usr/bin/python2 /usr/lib/google-cloud-sdk/platform/gsutil/gsutil -o GSUtil:default_project_id=shopify-tiers cp gs://examplebucket/examplefile-230GiB.tar.zst /data/mysql/tmp/restore.tar.zst
root 588 0.0 0.0 451944 29784 ? Sl 12:53 0:00 \_ /usr/bin/python2 /usr/lib/google-cloud-sdk/platform/gsutil/gsutil -o GSUtil:default_project_id=shopify-tiers cp gs://examplebucket/examplefile-230GiB.tar.zst /data/mysql/tmp/restore.tar.zst
root 590 0.0 0.0 451944 29784 ? Sl 12:53 0:00 \_ /usr/bin/python2 /usr/lib/google-cloud-sdk/platform/gsutil/gsutil -o GSUtil:default_project_id=shopify-tiers cp gs://examplebucket/examplefile-230GiB.tar.zst /data/mysql/tmp/restore.tar.zst
root 591 0.0 0.0 451944 29788 ? Sl 12:53 0:00 \_ /usr/bin/python2 /usr/lib/google-cloud-sdk/platform/gsutil/gsutil -o GSUtil:default_project_id=shopify-tiers cp gs://examplebucket/examplefile-230GiB.tar.zst /data/mysql/tmp/restore.tar.zst
root 593 0.0 0.0 451948 29788 ? Sl 12:53 0:00 \_ /usr/bin/python2 /usr/lib/google-cloud-sdk/platform/gsutil/gsutil -o GSUtil:default_project_id=shopify-tiers cp gs://examplebucket/examplefile-230GiB.tar.zst /data/mysql/tmp/restore.tar.zst
root 596 0.0 0.0 451948 29788 ? Sl 12:53 0:00 \_ /usr/bin/python2 /usr/lib/google-cloud-sdk/platform/gsutil/gsutil -o GSUtil:default_project_id=shopify-tiers cp gs://examplebucket/examplefile-230GiB.tar.zst /data/mysql/tmp/restore.tar.zst
```