Question relate to collaboration on git monorepo

[ZheNing Hu <adlternative@gmail.com>]

Hey, guys,

If two users of git monorepo are working on different sub project
/project1 and /project2 by partial-clone and sparse-checkout ,
if user one push first, then user two want to push too, he must
pull some blob which pushed by user one. I guess their repo size
will gradually increase by other's project's objects, so is there any way
to delete unnecessary blobs out of working project (sparse-checkout
filterspec), or just git pull don't really fetch these unnecessary blobs?

The large number of interruptions in git push may be another
problem, if thousands of probjects are in one monorepo, and
no one else has any code that would conflict with me in any way,
but I need pull everytime? Is there a way to make improvements
here?

Here's an example of how two users constrain each other when git push.

#!/bin/sh

rm -rf mono-repo
git init mono-repo -b main
(
  cd mono-repo
  mkdir project1
  mkdir project2
  for ((i=0;i<10;i++))
  do
    echo $i >> project1/file1
    echo $i >> project2/file2
  done
  git add .
  git commit -m init
)

rm -rf mono-repo.git
git clone --bare mono-repo

# user1
rm -rf m1
git clone --filter="blob:none" --no-checkout --no-local ./mono-repo.git m1
(
  cd m1
  git sparse-checkout set project1
  git checkout main
  for ((i=0;i<10;i++))
  do
    echo "data1-$i" >> project1/file1
    git add .
    git commit -m "c1 $i"
  done
)

# user2
rm -rf m2
git clone --filter="blob:none" --no-checkout --no-local ./mono-repo.git m2
(
  cd m2
  git sparse-checkout set project2
  git checkout main
  for ((i=0;i<10;i++))
  do
    echo "data2-$i" >> project2/file2
    git add .
    git commit -m "c2 $i"
  done
)

# user1 push
(
  cd m1
  git push
)

# user2 push failed, then pull user1's blob
(
  cd m2
  git cat-file --batch-check --batch-all-objects | grep blob | wc -l >
blob_count1
  git push
  git -c pull.rebase=false pull --no-edit #no conflict
  git cat-file --batch-check --batch-all-objects | grep blob | wc -l >
blob_count2
  diff blob_count1 blob_count2
)

--
ZheNing Hu