ImportError: cannot import name 'PlasmaStoreFull' from 'pyarrow.lib'

TL;DR: your pandarallel is too old for your pyarrow. pyarrow removed its Plasma store, so upgrade pandarallel to a release that no longer uses it, or pin an older pyarrow.

The error

ImportError: cannot import name 'PlasmaStoreFull' from 'pyarrow.lib'

Fix it

1. Upgrade pandarallel:

   pip install -U pandarallel

   Expected: installs a release fixed for modern pyarrow.

2. Verify:

   python -c "import pandarallel; print('ok')"

   Expected: imports cleanly.

3. Workaround if you cannot upgrade pandarallel: pin pyarrow below the Plasma removal:

   pip install "pyarrow<12"

   Expected: the old name exists again.

When this applies

Use this when import pandarallel raises this error with a recent pyarrow.

When it does not apply

If your own code uses pyarrow.plasma, migrate off Plasma entirely; it is gone for good. If pandarallel is current, reinstall it.

Compatibility

pandarallel releases before the Plasma fix; pyarrow 12+ where Plasma was removed.

Root cause

pyarrow deprecated its Plasma in-memory object store and removed it in pyarrow 12. pandarallel imported PlasmaStoreFull from pyarrow.lib, so the removal broke it at import time.

Edge cases

Pinning old pyarrow conflicts with pandas versions that need new pyarrow; upgrading pandarallel is the durable fix. Plasma is unmaintained upstream, so no future pyarrow will bring it back.

GitHub issue nalepae/pandarallel#48 reports ImportError: cannot import name 'PlasmaStoreFull' from 'pyarrow.lib' with a modern pyarrow installed. The verified resolution: pyarrow removed its Plasma in-memory store, so old pandarallel (which imported PlasmaStoreFull) broke at import; the fix is upgrading pandarallel to a release that no longer uses Plasma, or pinning an older pyarrow as a workaround. Full thread: https://github.com/nalepae/pandarallel/issues/48