Uploaded image for project: 'MariaDB Server'
  1. MariaDB Server
  2. MDEV-26133

Galera graceful shutdown without removing node from joined cluster

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    Description

      It is possible to have a graceful shutdown on running MariaDB/Galera node without removing it from joined cluster?

      Currently graceful shutdown removes node from joined cluster. This behavior is unwanted in Docker Compose/Swarm environments. There is a need for additional graceful shutdown signal (maybe USR1) to gracefully shutdown MariadDB daemon and Galera without removing node from cluster.

      Simple use case:

      • docker-compose up --scale db=3
      • docker-compose stop
      • All nodes received graceful shutdown signal in the same time from the stop command. In that case, Galera cannot handle this properly and the safe_to_bootstrap variable is not set to 1 in the grastate.dat file on any node. All nodes will fail after next docker-compose up/start invocation.

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          danblack Daniel Black added a comment -

          something in wsrep_notify_cmd to record the last member of the primary. I think I was right, bootstrap was just the first problem, recovery is the harder one.

          danblack Daniel Black added a comment - something in wsrep_notify_cmd to record the last member of the primary. I think I was right, bootstrap was just the first problem, recovery is the harder one.

          People

            danblack Daniel Black
            tymonx Tymoteusz Blazejczyk
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              Updated:

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