Re: Error message in the logs: "meta sync: ERROR: failed to read mdlog info with (2) No such file or directory"

Casey Bodley <cbodley@xxxxxxxxxx> · Wed, 17 Jan 2018 14:58:38 -0500



    On 01/15/2018 09:57 AM, Victor Flávio
      wrote:

    
        Hello,
        

        We've have a radosgw cluster(verion 12.2.2) in multisite
          mode. Our cluster is formed by one master realm, with one
          master zonegroup and two zones(which one is the master zone).
        

        We've followed the instructions of Ceph documentation to
          install and configure our cluster.
        

        The cluster works as expected, the objects and users are
          being replicated between the zones, but we always are getting
          this error message in our logs:
        

        2018-01-15 12:25:00.119301 7f68868e5700  1 meta sync:
          ERROR: failed to read mdlog info with (2) No such file or
          directory
        

        Some details about the errors message(s): 
         - They are only printed in the non-master zone log;
         - They are only printed when this "slave" zone try to sync
          the metadata info;
         - In each synchronization cycle of the metadata info, the
          number of this errors messages equals to the number of shards
          of metadata logs;
         - When we run the command "rados-admin mdlogs list", we've
          got a empty array as output in both zones;
         - The output of "rados-admin sync status" says every is ok
          and synced, which is true, despite the mdlog error messages in
          log.
        

        Anyone got this same problem? And how to fix it. I've tried
          and failed to many times to fix it.
      
      
      -- 

      
        Victor Flávio de Oliveira Santos

          Fullstack Developer/DevOps

          http://victorflavio.me

          Twitter: @victorflavio
            Skype: victorflavio.oliveira
            Github: https://github.com/victorflavio

              Telefone/Phone: +55 62 81616477
            

      _______________________________________________
ceph-users mailing list
ceph-users@xxxxxxxxxxxxxx
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com

    
    Hi Victor,

    
    We use a hashing strategy to spread metadata over these mdlog
    shards. It's likely that some shards are empty, especially if there
    are relatively few buckets/users in the system. These 'No such file
    or directory' errors are just trying to read from shard objects that
    haven't ever been written to. Logging them as noisy ERROR messages
    is certainly misleading, but it's probably nothing to worry about.

    
    Casey

  
_______________________________________________
ceph-users mailing list
ceph-users@xxxxxxxxxxxxxx
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com