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<div class="moz-cite-prefix">On 10/15/2016 08:22 PM, Ankireddypalle
Reddy wrote:<br>
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<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"> I am trying to follow the below
document for developing a translator.<o:p></o:p></p>
<p class="MsoNormal"> <a moz-do-not-send="true"
href="https://github.com/gluster/glusterfs/blob/master/doc/developer-guide/translator-development.md">https://github.com/gluster/glusterfs/blob/master/doc/developer-guide/translator-development.md</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> I’ve created a replica volume and
modified the vol file to include rot-13 translator. Below is
the snippet from vol file.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">volume myvol-posix<o:p></o:p></p>
<p class="MsoNormal"> type storage/posix<o:p></o:p></p>
<p class="MsoNormal"> option volume-id
b492191e-77a5-4fc3-9394-49218e36dae2<o:p></o:p></p>
<p class="MsoNormal"> option directory /brick1/repli<o:p></o:p></p>
<p class="MsoNormal">end-volume<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">volume <b><span style="color:red">myvol-rot13</span></b><o:p></o:p></p>
<p class="MsoNormal"> type encryption/rot-13<o:p></o:p></p>
<p class="MsoNormal"> subvolumes <b><span style="color:red">myvol-posix</span></b><o:p></o:p></p>
<p class="MsoNormal">end-volume<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">volume myvol-trash<o:p></o:p></p>
<p class="MsoNormal"> type features/trash<o:p></o:p></p>
<p class="MsoNormal"> option trash-internal-op off<o:p></o:p></p>
<p class="MsoNormal"> option brick-path /brick1/repli<o:p></o:p></p>
<p class="MsoNormal"> option trash-dir .trashcan<o:p></o:p></p>
<p class="MsoNormal"> subvolumes <b><span style="color:red">myvol-rot13</span></b><o:p></o:p></p>
<p class="MsoNormal">end-volume<o:p></o:p></p>
<p class="MsoNormal">…<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">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.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Can someone please explain how the reads
are getting serviced here without hitting the posix layer.</p>
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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.<br>
<br>
HTH,<br>
Ravi<br>
<br>
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<p class="MsoNormal"><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks and Regards,<o:p></o:p></p>
<p class="MsoNormal">Ram <o:p></o:p></p>
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