Uploaded image for project: 'MariaDB Server'
  1. MariaDB Server
  2. MDEV-18407

Galera: Rolling upgrade: 10.3 nodes are stopped with signal 6 on attempt to join upgraded 10.4 node



    • Bug
    • Status: Closed (View Workflow)
    • Blocker
    • Resolution: Fixed
    • 10.4.2, 10.3.13
    • 10.4.3, 10.3.14
    • Galera, Galera SST
    • CentOS Linux release 7.6.1810 (Core)


      This issue was discovered on testing of Rolling Upgrade according to "MariaDB 10.4 Cluster Rolling Upgrade - Naive Approach" by Seppo Jaakola: https://docs.google.com/document/d/1z4XTpLpzStWMFaNnrSmiESaIVeCoKhu9Hbb1SrDPf0w


      0. Build MariaDB Server 10.3 with Galera 3 and MariaDB Server 10.4 with Galera 4.

      0.1. Galera 3.

      git clone https://github.com/MariaDB/galera.git galera3
      cd galera3
      git checkout mariadb-3.x
      git submodule init
      git submodule update
      ./scripts/build.sh -d --dl 2
      sudo cp libgalera_smm.so /usr/lib/libgalera_smm_3.so

      0.2. Server 10.3.

      git clone https://github.com/mariadb/server 10.3
      cd 10.3
      git checkout 10.3
      git pull
      git clean -d -f -x
      cmake . -DCMAKE_BUILD_TYPE=Debug
      make -j16

      0.3. Galera 4.
      The same steps as described for Galera 3 in the p.0.1, but checkout mariadb-4.x branch.
      sudo cp libgalera_smm.so /usr/lib/libgalera_smm_4.so

      0.4. Server 10.4.
      The same steps as described for 10.3 in the p.0.2, but checkout bb-10.4-galera4 branch.

      1. Start 3 MariaDB 10.3 nodes with mtr:
      1.0. export WSREP_PROVIDER=/usr/lib/libgalera_smm_3.so
      1.1. cd mysql-test
      1.2. "./mtr --suite=galera_3nodes --start-and-exit"

      Actual result:
      3 servers are running:

      Started [mysqld.1 - pid: 8432, winpid: 8432] [mysqld.2 - pid: 8433, winpid: 8433] [mysqld.3 - pid: 8434, winpid: 8434]
      worker[1] Using config for test galera_3nodes.galera_certification_ccc
      worker[1] Port and socket path for server(s):
      worker[1] mysqld.1  16000  /home/stepan/mariadb/10.3/mysql-test/var/tmp/mysqld.1.sock
      worker[1] mysqld.2  16001  /home/stepan/mariadb/10.3/mysql-test/var/tmp/mysqld.2.sock
      worker[1] mysqld.3  16002  /home/stepan/mariadb/10.3/mysql-test/var/tmp/mysqld.3.sock
      $ ps -ef | grep mysqld
      stepan     8432      1  1 19:46 pts/2    00:00:01 /home/stepan/mariadb/10.3/sql/mysqld --defaults-group-suffix=.1 --defaults-file=/home/stepan/mariadb/10.3/mysql-test/var/my.cnf --log-output=file --innodb --innodb-cmpmem --innodb-cmp-per-index --innodb-trx --innodb-locks --innodb-lock-waits --innodb-metrics --innodb-buffer-pool-stats --innodb-buffer-page --innodb-buffer-page-lru --innodb-sys-columns --innodb-sys-fields --innodb-sys-foreign --innodb-sys-foreign-cols --innodb-sys-indexes --innodb-sys-tables --innodb-sys-virtual --core-file --loose-debug-sync-timeout=300
      stepan     8433      1  1 19:46 pts/2    00:00:01 /home/stepan/mariadb/10.3/sql/mysqld --defaults-group-suffix=.2 --defaults-file=/home/stepan/mariadb/10.3/mysql-test/var/my.cnf --log-output=file --innodb --innodb-cmpmem --innodb-cmp-per-index --innodb-trx --innodb-locks --innodb-lock-waits --innodb-metrics --innodb-buffer-pool-stats --innodb-buffer-page --innodb-buffer-page-lru --innodb-sys-columns --innodb-sys-fields --innodb-sys-foreign --innodb-sys-foreign-cols --innodb-sys-indexes --innodb-sys-tables --innodb-sys-virtual --core-file --loose-debug-sync-timeout=300
      stepan     8434      1  1 19:46 pts/2    00:00:01 /home/stepan/mariadb/10.3/sql/mysqld --defaults-group-suffix=.3 --defaults-file=/home/stepan/mariadb/10.3/mysql-test/var/my.cnf --log-output=file --innodb --innodb-cmpmem --innodb-cmp-per-index --innodb-trx --innodb-locks --innodb-lock-waits --innodb-metrics --innodb-buffer-pool-stats --innodb-buffer-page --innodb-buffer-page-lru --innodb-sys-columns --innodb-sys-fields --innodb-sys-foreign --innodb-sys-foreign-cols --innodb-sys-indexes --innodb-sys-tables --innodb-sys-virtual --core-file --loose-debug-sync-timeout=300

      And the ports are used:

      $ sudo netstat -tulpn | grep mysqld
      tcp        0      0 *               LISTEN      198749/mysqld
      tcp        0      0*               LISTEN      198747/mysqld
      tcp        0      0*               LISTEN      198748/mysqld
      tcp        0      0*               LISTEN      198749/mysqld
      tcp        0      0 *               LISTEN      198747/mysqld
      tcp        0      0 *               LISTEN      198748/mysqld

      2. Copy [mysqld.3] group from var/my.cnf into separate configuration file: mysqld.3.cnf, and make following edits:

      2.1. Edit:

      wsrep_provider=<path to galera 4 library>
      basedir=<10.4 source tree>
      character-sets-dir=<10.4 source tree>/sql/share/charsets
      lc-messages-dir=<10.4 source tree>/sql/share/

      2.2. And add there also:


      3. Load some data for each node:

      3.1. Run the client:
      /home/stepan/mariadb/10.3/client/mysql -u root -S /home/stepan/mariadb/10.3/mysql-test/var/tmp/mysqld.1.sock

      3.2. Create a table:

      use test;
      MariaDB [test]> create table t (i int primary key auto_increment, j int);

      3.3. Load data for some time:

      watch "/home/stepan/mariadb/10.3/client/mysql -uroot -h0 -P16000 -e'insert into test.t(j) values(1)' "
      watch "/home/stepan/mariadb/10.3/client/mysql -uroot -h0 -P16001 -e'insert into test.t(j) values(1)' "
      watch "/home/stepan/mariadb/10.3/client/mysql -uroot -h0 -P16002 -e'insert into test.t(j) values(1)' "

      3.4. Stop loading data.

      4. Upgrade node 3.

      4.1 Stop the Server:
      /home/stepan/mariadb/10.3/client/mysqladmin -u root shutdown -S /home/stepan/mariadb/10.3/mysql-test/var/tmp/mysqld.3.sock

      4.2. Run 10.4 binaries with 10.3 data:
      /home/stepan/mariadb/10.4/sql/mysqld --defaults-file=/home/stepan/mariadb/10.3/mysql-test/var/mysqld.3.cnf --wsrep_provider=none

      4.3. Run mysql_upgrade:
      /home/stepan/mariadb/10.4/client/mysql_upgrade --defaults-file=/home/stepan/mariadb/10.3/mysql-test/var/mysqld.3.cnf -uroot -h0 -P16002

      Actual result:

      Phase 1/7: Checking and upgrading mysql database
      Processing databases
      mysql.column_stats                                 OK
      mysql.columns_priv                                 OK
      mysql.db                                           OK
      mysql.event                                        OK
      mysql.func                                         OK
      mysql.gtid_slave_pos                               OK
      mysql.help_category                                OK
      mysql.help_keyword                                 OK
      mysql.help_relation                                OK
      mysql.help_topic                                   OK
      mysql.host                                         OK
      mysql.index_stats                                  OK
      mysql.innodb_index_stats                           OK
      mysql.innodb_table_stats                           OK
      mysql.plugin                                       OK
      mysql.proc                                         OK
      mysql.procs_priv                                   OK
      mysql.proxies_priv                                 OK
      mysql.roles_mapping                                OK
      mysql.servers                                      OK
      mysql.table_stats                                  OK
      mysql.tables_priv                                  OK
      mysql.time_zone                                    OK
      mysql.time_zone_leap_second                        OK
      mysql.time_zone_name                               OK
      mysql.time_zone_transition                         OK
      mysql.time_zone_transition_type                    OK
      mysql.transaction_registry                         OK
      mysql.user                                         OK
      Phase 2/7: Installing used storage engines... Skipped
      Phase 3/7: Fixing views
      Phase 4/7: Running 'mysql_fix_privilege_tables'
      Phase 5/7: Fixing table and database names
      Phase 6/7: Checking and upgrading tables
      Processing databases
      mtr.global_suppressions                            OK
      mtr.test_suppressions                              OK
      test.t                                             OK
      Phase 7/7: Running 'FLUSH PRIVILEGES'

      4.4. Stop the Server:
      /home/stepan/mariadb/10.3/client/mysqladmin -u root shutdown -S /home/stepan/mariadb/10.3/mysql-test/var/tmp/mysqld.3.sock

      4.5. export PATH=$PATH:/home/stepan/mariadb/10.4/scripts

      5. Check upgraded node 3 without the cluster.

      5.1. Start the server:
      /home/stepan/mariadb/10.4/sql/mysqld --defaults-file=/home/stepan/mariadb/10.3/mysql-test/var/mysqld.3.cnf

      5.2. Start the client:
      /home/stepan/mariadb/10.3/client/mysql -u root -S /home/stepan/mariadb/10.3/mysql-test/var/tmp/mysqld.3.sock

      Actual result:
      Output: "Server version: 10.4.2-MariaDB-debug-log Source distribution"

      5.3. Stop the Server:
      /home/stepan/mariadb/10.3/client/mysqladmin -u root shutdown -S /home/stepan/mariadb/10.3/mysql-test/var/tmp/mysqld.3.sock

      6. Attempt to join node 3 back to the cluster.

      6.1. Add to mysqld.3.cnf:


      6.2. Start the server:
      /home/stepan/mariadb/10.4/sql/mysqld --defaults-file=/home/stepan/mariadb/10.3/mysql-test/var/mysqld.3.cnf

      Actual results:

      1. Nodes 1 and 2 stopped with [ERROR] mysqld got signal 6"[ERROR] mysqld got signal 6":


      2019-01-28 12:22:26 0 [Note] WSREP: Flow-control interval: [28, 28]
      2019-01-28 12:22:26 0 [Note] WSREP: Trying to continue unpaused monitor
      2019-01-28 12:22:26 2 [Note] WSREP: New cluster view: global state: e2c6689d-2189-11e9-b139-1bd4f4035078:2241, view# 8: Primary, number of nodes: 3, my index: 1, protocol version 3
      2019-01-28 12:22:26 2 [Note] WSREP: wsrep_notify_cmd is not defined, skipping notification.
      2019-01-28 12:22:26 2 [Note] WSREP: REPL Protocols: 9 (4, 2)
      2019-01-28 12:22:26 2 [Note] WSREP: Assign initial position for certification: 2241, protocol version: 4
      2019-01-28 12:22:26 0 [Note] WSREP: Service thread queue flushed.
      mysqld: gcs/src/gcs_group.cpp:1186: int gcs_group_find_donor(const gcs_group_t*, int, int, const char*, int, const gu_uuid_t*, gcs_seqno_t): Assertion `ist_seqno != GCS_SEQNO_ILL' failed.
      190128 12:22:27 [ERROR] mysqld got signal 6 ;

      2. Upgraded node 3 is still working.

      Upgraded node 3 successfully joins the cluster and other nodes continue to operate.

      Other logs are also attached.


        1. my.cnf
          8 kB
        2. mysqld.1.err
          46 kB
        3. mysqld.2.err
          41 kB
        4. mysqld.3.cnf
          1 kB
        5. mysqld.3.err
          107 kB
        6. mysqld.3.log
          170 kB

        Issue Links



              seppo Seppo Jaakola
              stepan.patryshev Stepan Patryshev (Inactive)
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