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  1. MariaDB Server
  2. MDEV-10314

wsrep_sync_wait does not seem to be working

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    Description

      We have been trying to test the critical reads that are enabled by 'wsrep_sync_wait' parameter but seems like the results are not deterministic.

      Here is the test script:
      https://github.com/sjangra-git/galera-tests/blob/master/scripts/test.sh

      This test script based out of the following test-case:
      https://github.com/MariaDB/server/blob/2783fc7d14bc8ad16acfeb509d3b19615023f47a/mysql-test/suite/galera/t/mysql-wsrep%23201.test#L5

      Here is the version info:

      MariaDB [(none)]> show variables like 'version%';
      		 
      +-------------------------+---------------------------------+
      		 
      | Variable_name           | Value                           |
      		 
      +-------------------------+---------------------------------+
      		 
      | version                 | 10.1.12-MariaDB                 |
      		 
      | version_comment         | MariaDB Server                  |
      		 
      | version_compile_machine | x86_64                          |
      		 
      | version_compile_os      | Linux                           |
      		 
      | version_malloc_library  | system jemalloc                 |
      		 
      | version_ssl_library     | OpenSSL 1.0.1e-fips 11 Feb 2013 |
      		 
      +-------------------------+---------------------------------+

      The errors are more prominent when we run the following java test where the connection is persisted, so the queries are being attempted faster:
      https://github.com/sjangra-git/galera-tests

      Auto-commit is OFF on the servers in the cluster:

      MariaDB [(none)]> show global variables like 'autocommit';
      		 
      +---------------+-------+
      		 
      | Variable_name | Value |
      		 
      +---------------+-------+
      		 
      | autocommit    | OFF   |
      		 
      +---------------+-------+

      Few runs failed, few passed for the same test:

      -bash-4.1$ ./test.sh 10.226.76.38 10.226.76.32
      		 
      val1=5735 val2=5732
      		 
      syn_wait FAILED
      		 
      -bash-4.1$ ./test.sh 10.226.76.38 10.226.76.32
      		 
      -bash-4.1$ ./test.sh 10.226.76.38 10.226.76.32
      		 
      -bash-4.1$ ./test.sh 10.226.76.38 10.226.76.32
      		 
      -bash-4.1$ ./test.sh 10.226.76.38 10.226.76.32
      		 
      -bash-4.1$ ./test.sh 10.226.76.38 10.226.76.32

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              nirbhay_c Nirbhay Choubey (Inactive)
              sandeep Sandeep Jangra
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                Updated:
                Resolved:

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