Aditya Manthramurthy fd4e15c116 Flush the records staging buffer periodically (#7193)
- Staging buffer is flushed every 500ms. In cases where the result
  records are slowly generated (e.g. when a where condition
  matches very few records), this change causes the server to send
  results even though the staging buffer is not full.

- Refactor messageWriter code to use simpler channel based
  co-ordination instead of atomic variables.
2019-02-06 16:03:05 +05:30
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