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  1. Percona Toolkit
  2. PT-196

pt-onine-schema-change is pausing because {some_status_variable}=0

    Details

    • Type: Bug
    • Status: Done
    • Priority: Medium
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 3.0.5
    • Component/s: None
    • Labels:
      None

      Description

      Launchpad: https://bugs.launchpad.net/percona-toolkit/+bug/1618918

      Although 0 is normal value for global variable {some_status_variable}, but tool is pausing.
      Doc for --max-load say that pt-online-schema-change "pause if any status variables are higher than their thresholds", nothing about zero value.
      So, how use --max-load with variables that can take zero value in normal state of db?
      I think that trouble in this line of code:
      https://github.com/percona/percona-toolkit/blob/2.2/bin/pt-online-schema-change#L5188

      pt-online-schema-change --version
      pt-online-schema-change 2.2.19

      Console command:
      pt-online-schema-change --alter 'drop column test' --charset 'utf8' --host 127.0.0.1 --port 32768 --user 'root' --password 'owoxsql' --max-load Threads_running=400,wsrep_flow_control_recv=1,wsrep_local_send_queue=1 --critical-load Threads_running=400 --null-to-not-null --no-check-alter --execute --alter-foreign-keys-method none --force --statistics D=test,t=test

      Output:
      No slaves found. See --recursion-method if host dcc369b9be1d has slaves.
      Not checking slave lag because no slaves were found and --check-slave-lag was not specified.
      Operation, tries, wait:
        analyze_table, 10, 1
        copy_rows, 10, 0.25
        create_triggers, 10, 1
        drop_triggers, 10, 1
        swap_tables, 10, 1
        update_foreign_keys, 10, 1
      Not updating foreign keys because --alter-foreign-keys-method=none. Foreign keys that reference the table will no longer work.
      Altering `test`.`test`...
      Creating new table...
      Created new table test._test_new OK.
      Altering new table...
      Altered `test`.`_test_new` OK.
      2016-08-31T17:09:45 Creating triggers...
      2016-08-31T17:09:45 Created triggers OK.
      2016-08-31T17:09:45 Copying approximately 1 rows...
      Pausing because wsrep_flow_control_recv=0, wsrep_local_send_queue=0.
      ^C# Exiting on SIGINT.
      Not dropping triggers because the tool was interrupted. To drop the triggers, execute:
      DROP TRIGGER IF EXISTS `test`.`pt_osc_test_test_del`;
      DROP TRIGGER IF EXISTS `test`.`pt_osc_test_test_upd`;
      DROP TRIGGER IF EXISTS `test`.`pt_osc_test_test_ins`;
      Not dropping the new table `test`.`_test_new` because the tool was interrupted. To drop the new table, execute:
      DROP TABLE IF EXISTS `test`.`_test_new`;

      1. Event Count
      2. ====== =====
      3. INSERT 1
        `test`.`test` was not altered.

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              • Assignee:
                carlos.salguero Carlos Salguero
                Reporter:
                carlos.salguero Carlos Salguero
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                • Created:
                  Updated:
                  Resolved: