Re: rot-13 Translator query

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On 10/15/2016 08:22 PM, Ankireddypalle Reddy wrote:

Hi,

      I am trying to follow the below document for developing a translator.

      https://github.com/gluster/glusterfs/blob/master/doc/developer-guide/translator-development.md

 

      I’ve created a replica volume and modified the vol file to include rot-13 translator. Below is the snippet from vol file.

 

volume myvol-posix

    type storage/posix

    option volume-id b492191e-77a5-4fc3-9394-49218e36dae2

    option directory /brick1/repli

end-volume

 

volume myvol-rot13

    type encryption/rot-13

    subvolumes myvol-posix

end-volume

 

volume myvol-trash

    type features/trash

    option trash-internal-op off

    option brick-path /brick1/repli

    option trash-dir .trashcan

    subvolumes myvol-rot13

end-volume

 

The writes are getting intercepted by the translator and the file is getting encrypted. But the reads don’t seem to be getting intercepted by the translator.  I tried setting break point in the posix_readv function and attach the brick daemons to gdb. But posix_readv does not seem to be getting called on the brick daemon and the read completes on the application side.

 

Can someone please explain how the reads are getting serviced here without hitting the posix layer.

It could be due to client side caching. I usually disable all performance xlators (write-behind, read-head, io-cache, stat-prefetch, quick-read, open-behind) when I want to remove caching effects while debugging. drop-caches also helps.

HTH,
Ravi

 

Thanks and Regards,

Ram   

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