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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