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  1. MariaDB Server
  2. MDEV-33500

rpl.rpl_parallel_sbm can fail on slow machines, e.g. MSAN/Valgrind builders

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    Description

      In an addition to test rpl.rpl_parallel_sbm added by MDEV-32265, the test uses sleep statements alone to test Seconds_Behind_Master with delayed replication. On slow running machines, the test can pass the intended MASTER_DELAY duration and Seconds_Behind_Master can become 0, when the test expects the transaction to still be actively in a delaying state.

      The test failure resembles the following:

      rpl.rpl_parallel_sbm 'mix'               w20 [ fail ]
              Test ended at 2024-02-20 10:27:35
      CURRENT_TEST: rpl.rpl_parallel_sbm
      mysqltest: At line 85: Seconds_Behind_Master did not increase after sleeping, but should have
      

      And the following patch reproduces this consistently

      diff --git a/mysql-test/suite/rpl/t/rpl_parallel_sbm.test b/mysql-test/suite/rpl/t/rpl_parallel_sbm.test
      index 58c0db15e47..5baf6a56487 100644
      --- a/mysql-test/suite/rpl/t/rpl_parallel_sbm.test
      +++ b/mysql-test/suite/rpl/t/rpl_parallel_sbm.test
      @@ -77,6 +77,10 @@ if (`SELECT $sbm_trx1_arrive > ($seconds_since_idling + 1)`)
       --echo # Sleeping 1s to increment SBM
       sleep 1;
       
      +--disable_query_log
      +sleep 4;
      +--enable_query_log
      +
       --echo # Ensuring Seconds_Behind_Master increases after sleeping..
       --let $sbm_trx1_after_1s_sleep= query_get_value(SHOW SLAVE STATUS, Seconds_Behind_Master, 1)
       if (`SELECT $sbm_trx1_after_1s_sleep <= $sbm_trx1_arrive`)
      

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              bnestere Brandon Nesterenko
              bnestere Brandon Nesterenko
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                Resolved:

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