Re: 3.7.13, index healing broken?

Dmitry Melekhov <dm@xxxxxxxxxx> · Wed, 13 Jul 2016 13:39:37 +0400



    13.07.2016 13:24, Pranith Kumar
      Karampuri пишет:

    
          On Wed, Jul 13, 2016 at 2:50 PM,
            Dmitry Melekhov <dm@xxxxxxxxxx> wrote:

            
                13.07.2016 13:10, Pranith Kumar Karampuri пишет:

                
                        On Wed, Jul 13, 2016 at
                          2:25 PM, Dmitry Melekhov <dm@xxxxxxxxxx>
                          wrote:

                          13.07.2016

                            11:40, Pranith Kumar Karampuri пишет:

                               
                                You recipe doesn't work :-(  If there is
                                difference between bricks directories
                                due to direct brick manipulation it
                                leads to problems.

                                
                                You have to execute "gluster volume heal
                                <volname> full" for triggering
                                full heal.

                                
                             yeah, but I need to know that I need
                            to execute it.

                            any help from gluster or only external
                            script?

                            
                        I guess it is not too difficult to set up
                        cron/systemd.timer to run this command once in a
                        while right?
                    
                  
                 Too difficult? No. 

                So you are suggesting to run heal full by cron? Right?

                Really, I don't know how much resources this full heal
                may need in real installations.

                If not much- why self-heal doesn't call it?

                
            Because we don't expect people to touch the bricks. For
              a corner case it doesn't make sense to keep doing full
              filesystem scan. But we do provide the CLI for people who
              want it.

            
    Well, why run heal every 10 minutes if no problems are expected?

    From your link:

    
    The index heal is done:

      a) Every 600 seconds (can be changed via the cluster.heal-timeout
      volume option)

      b) When it is explicitly triggered via the gluster vol heal
        <VOLNAME> command

      c) Whenever a replica brick that was down comes back up. 

    
    As I can understand, this index heal runs once per volume, not on
    specific node, this is why there is self-heal daemon,

    otherwise this can be achieved by cron. If I have node with cron
    down, then I'll get no full heal, I can, definitely, run next full
    heal on different node by cron :-)

    
                       What script do you need
                        to write? I didn't get you.

                      
                 Which compares bricks directories, and, if it
                there is real need- it alerts me, I can run heal full
                or, may be, just trigger files heal by reading some
                files over fuse.

                Could you , please, tell me how heal full works and why
                it is not part of self-heal process?

              
            You can read more about it at: https://github.com/gluster/glusterfs/blob/master/doc/developer-guide/afr-self-heal-daemon.md

            
    Thank you!

    I think it will be wise to add full heal interval to self-heal
    daemon.

    
                Thank you!

                    
                          -- 

                          
                            Pranith

                            
          -- 

          
            Pranith

            
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