Flatfs DS has to handle out of FDs in Query

[whyrusleeping]

While running a gc i got this error message:

13:08:36.065 ERROR blockstore: blockstore.AllKeysChan got err:%!(EXTRA *errors.errorString=walk failed: open /home/whyrusleeping/.ipfs/blocks/FY: too many open files) blockstore.go:201

[Kubuxu]

The Query method has to be handle the FD problems

[gammazero]

This should be fixed by changes to how batches of data are written.

Handled by:

• refactor: rewrite batch mode to use temp directory go-ds-flatfs#142
• feat: improved go-ds-flatfs #11092