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fix: use retriable for flaky sql tests

Arseniy Volynets requested to merge av/fix_flaky_sql_tests into master

Summary

  • fix: use retriable for flaky sql tests

  • Some sql queries that read from sharded tables can fail with timeout error, but because of rethrows it is showed as 'Connection reset error'. In order to avoid retrying such tests in CI we can use retries in tests. Note: solution to the problem itself is in the progress, but we don't know when it will be done: https://github.com/tarantool/vshard/pull/442

  • Another solution is to use global tables instead of sharded tables in tests where it does not matter.

  • This commit uses both approaches: when possible sharded tables were replaced with global ones. In other cases retries were used.

Remove these retries when sbroad#542 (closed) is done

  • Close #691 (closed)
  • Cherry-pick to: none
  • Docs follow-up: not necessary
Edited by Arseniy Volynets

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