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Manual resolution of split-brains [1] has been a tedious task involving understanding and modifying AFR's changelog extended attributes. To simplify and to an extent automate this task, we are proposing a new CLI command with which the user can specify what the source brick/file is, and automatically heal the files in the appropriate direction. Command: gluster volume resolve-split-brain <VOLNAME> {<bigger_file> | source-brick <brick_name> [<file>] } Breaking up the command into its possible options, we have: a) gluster volume resolve-split-brain <VOLNAME> <bigger_file> When this command is executed, AFR will consider the brick having the highest file size as the source and heal it to all other bricks (including all other sources and sinks) in that replica subvolume. If the file size is same in all the bricks, it does *not* heal the file. b) gluster volume resolve-split-brain <VOLNAME > source-brick <brick_name > [<file>] When this command is executed, if <file> is specified, AFR heals the file from the source-brick <brick_name> to all other bricks of that replica subvolume. For resolving multiple files, the command must be run iteratively, once per file. If <file> is not specified, AFR heals all the files that have an entry in .glusterfs/indices/xattrop *and* are in split-brain. As before, heals happen from source-brick <brick_name> to all other bricks. Future work could also include extending the command to add other policies like choosing the file having the latest mtime as the source, integration with trash xlator wherein the files deleted from the sink are moved to the trash dir etc. Please give feedback on the above. Regards, Ravi [1] https://github.com/gluster/glusterfs/blob/master/doc/split-brain.md |
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