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[Sekhar <msekharmca@xxxxxxxxx>]

Hi,
Please explain me more about drizzle flow architecture from clients changes the event and where it will stored and how it will replicated multi master and slaves.

Thanks,
sekhar.

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https://bugs.launchpad.net/bugs/867866

Title:
  multi-master replication test failing - duplicate trx message error/
  first master rpl failure.

Status in A Lightweight SQL Database for Cloud Infrastructure and Web Applications:
  Fix Released
Status in Drizzle 7.1 series:
  Fix Released

Bug description:
  So, I have created the infrastructure to setup multi-master topologies for testing.
  The gist of the test is we spin 3 servers = 2 masters, one slave replicating from both.
  master1 = we create test.t1 and some records
  master2 = we create test.t2 and some records
  When we try:
  ./dbqp --suite=slave --record multi_master_basic, the test fails as follows (slave crashes)
  $ cat workdir/bot0/s2/var/log/s2.err 
  InnoDB: Doublewrite buffer not found: creating new
  InnoDB: Doublewrite buffer created
  InnoDB: 127 rollback segment(s) active.
  InnoDB: Creating foreign key constraint system tables
  InnoDB: Foreign key constraint system tables created
  (SQLSTATE 00000) Duplicate entry '772-1' for key 'PRIMARY'
  Failure while executing:
  INSERT INTO `sys_replication`.`queue` (`master_id`, `trx_id`, `seg_id`, `commit_order`,  `originating_server_uuid`, `originating_commit_id`, `msg`) VALUES (2, 772, 1, 1, 'ac9c8ac0-8f10-474b-9bbd-b61d2cdb2b93' , 1, 'transaction_context {
    server_id: 1
    transaction_id: 772
    start_timestamp: 1317760732106016
    end_timestamp: 1317760732106017
  }
  event {
    type: STARTUP
  }
  segment_id: 1
  end_segment: true
  ')

  
  Replication slave: Unable to insert into queue.
  Replication slave: drizzle_state_read:lost connection to server (EOF)
  Lost connection to master. Reconnecting.
  Replication slave: drizzle_state_connect:could not connect
  111004 16:39:05  InnoDB: Starting shutdown...

  Testing the setup with --start-and-exit shows that we only seem to be replicating from master 2, not master 1.
  the config file is as follows:
  ignore-errors

  [master1]
  master-host=127.0.0.1
  master-port=9306
  master-user=root
  master-pass=''

  
  [master2]
  master-host=127.0.0.1
  master-port=9312
  master-user=root
  master-pass=''

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