The OID of the put object can be saved into index file immediatly in upload-bin

[AliceInHunterland]

Is your feature request related to a problem? Please describe.

I'm always frustrated when it appears that OID can be calculated in the uploadObj function. So we do not need to perform lots of searches for OIDs after the main batch of blocks is done.

Describe the solution you'd like

Return OID from uploadObj and save it into the index file right away. Ref. a0a0358

Describe alternatives you've considered

Leave as is.

[AnnaShaleva]

Consider #3650 (comment) during implementation.

[AliceInHunterland]

Consider #3650 (comment) during implementation.

And uploadIndexFiles can't be removed anyway, we must consider cases when you don't have all OIDs in-place.

In a0a0358 uploadIndexFiles is not removed but moved to the first place.

1. Check and upload index files using uploadIndexFiles, and return a partially filled buffer (if oldestMissingBlockIndex\ indexFileSize!=0).
2. Upload blocks from oldestMissingBlockIndex and when the buffer is full - upload the index file.

What do you mean by cases when you don't have all OIDs in-place.?

[AnnaShaleva]

is not removed but moved to the first place.

OK. It needs some care.

What do you mean by cases when you don't have all OIDs in-place.?

E.g. uploading index file without block object uploads. Or with partially uploaded blocks. I'm not saying that your commit doesn't contain this code, but such edge cases must be handled with care and we must ensure that script works properly for such edge cases.