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<a href="https://github.com/tarantool/tarantool/commit/<a class=hub.com/tarantool/tarantool/commit/f60e6696b58a7612eb58ba97ca33600f93edb72f">f60e6696b<a href="https://github.com/tarantool/tarantool/commit/f60e6696b58a7612eb58ba97ca33600f93edb72f">&quot;&gt;test: replication/wal_rw_stress fix wait_cond

Found that on heavy loaded hosts the test tries to check replication
downstream status when downstream structure is not ready and it fails
with the error:

[017] --- replication/wal_rw_stress.result	Thu Jul  9 17:04:16 2020
[017] +++ replication/wal_rw_stress.reject	Fri May  8 08:25:15 2020
[017] @@ -75,7 +75,8 @@
[017]      return box.info.replication[1].downstream.status ~= &amp;#39;stopped&amp;#39; \
[017]  end) or box.info
[017]  ---
[017] -- true
[017] +- error: &amp;#39;[string &amp;quot;return test_run:wait_cond(function()         ...&amp;quot;]:1: attempt to
[017] +    index field &amp;#39;&amp;#39;downstream&amp;#39;&amp;#39; (a nil value)&amp;#39;
[017]  ...
[017]  test_run:cmd(&amp;quot;switch default&amp;quot;)
[017]  ---
[017]

So the wait condition should start from the check of the downstream
structure availability.

Follows up #4977

(cherry picked from commit </a><a class="double-link" href="https://github.com/tarantool/tarantool/commit/<a class="double-link" href="https://github.com/tarantool/tarantool/commit/d3e2a2a4ec7ca14e65d6f7b24e9e53fe02c04dca">d3e2a2a4e</a>">d3e2a2a4e</a><a href="https://github.com/tarantool/tarantool/commit/f60e6696b58a7612eb58ba97ca33600f93edb72f">)

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