Nadav Har'El d2e089777b Merge 'Yield while building large results in Alternator - rjson::print, executor::batch_get_item' from Marcin Maliszkiewicz ...

Adds preemption points used in Alternator when:
 - sending bigger json response
 - building results for BatchGetItem

I've tested manually by inserting in preemptible sections (e.g. before `os.write`) code similar to:

    auto start  = std::chrono::steady_clock::now();
    do { } while ((std::chrono::steady_clock::now() - start) < 100ms);

and seeing reactor stall times. After the patch they
were not increasing while before they kept building up due to no preemption.

Refs #7926
Fixes #13689

Closes #12351

* github.com:scylladb/scylladb:
  alternator: remove redundant flush call in make_streamed
  utils: yield when streaming json in print()
  alternator: yield during BatchGetItem operation

2023-06-04 23:22:51 +03:00

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