flaky test: router/reconnect_to_master

[Gerold103]

router/reconnect_to_master.test.lua                             [ fail ]
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Test failed! Result content mismatch:
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--- router/reconnect_to_master.result   Sun Oct 31 11:08:43 2021
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+++ /home/runner/work/tarantool/tarantool/test/var/rejects/router/reconnect_to_master.reject    Sun Oct 31 11:12:01 2021
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@@ -92,7 +92,7 @@
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 ...
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 count_known_buckets()
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 ---
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-- 10
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+- 0
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 ...
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 fiber = require('fiber')
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 ---
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Last 15 lines of Tarantool Log file [Instance "test"][/home/runner/work/tarantool/tarantool/test/var/001_router/test.log]:
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2021-10-31 11:11:53.901 [4694] main/149/console/::1:51012 I> Slaves are connected to a master "storage_1_a"
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2021-10-31 11:11:53.901 [4694] main/149/console/::1:51012 I> Waiting until slaves are connected to a master
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2021-10-31 11:11:54.006 [4694] main/149/console/::1:51012 I> Slaves are connected to a master "storage_2_a"
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2021-10-31 11:11:55.007 [4694] main/155/console/::1:51380 I> Waiting until slaves are connected to a master
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2021-10-31 11:11:55.012 [4694] main/155/console/::1:51380 I> Slaves are connected to a master "storage_1_a"
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2021-10-31 11:11:55.012 [4694] main/155/console/::1:51380 I> Waiting until slaves are connected to a master
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2021-10-31 11:11:55.118 [4694] main/155/console/::1:51380 I> Slaves are connected to a master "storage_2_a"
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2021-10-31 11:11:57.246 [4694] main/161/console/::1:52384 I> Waiting until slaves are connected to a master
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2021-10-31 11:11:57.251 [4694] main/161/console/::1:52384 I> Slaves are connected to a master "storage_1_a"
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2021-10-31 11:11:57.251 [4694] main/161/console/::1:52384 I> Waiting until slaves are connected to a master
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2021-10-31 11:11:57.356 [4694] main/161/console/::1:52384 I> Slaves are connected to a master "storage_2_a"
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2021-10-31 11:11:58.485 [4694] main/167/console/::1:54326 I> Waiting until slaves are connected to a master
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2021-10-31 11:11:58.489 [4694] main/167/console/::1:54326 I> Slaves are connected to a master "storage_1_a"
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2021-10-31 11:11:58.490 [4694] main/167/console/::1:54326 I> Waiting until slaves are connected to a master
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2021-10-31 11:11:58.595 [4694] main/167/console/::1:54326 I> Slaves are connected to a master "storage_2_a"
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Reproduce file /home/runner/work/tarantool/tarantool/test/var/reproduce/001_router.list.yaml
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---
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- [router/boot_replica_first.test.lua, null]
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- [router/complex_call.test.lua, null]
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- [router/empty_cluster.test.lua, null]
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- [router/exponential_timeout.test.lua, null]
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- [router/garbage_collector.test.lua, null]
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- [router/map-reduce.test.lua, null]
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- [router/master_discovery.test.lua, null]
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- [router/reconnect_to_master.test.lua, null]
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