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<div class="moz-cite-prefix">On 26/04/19 10:53 PM, Junsong Li wrote:<br>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Hello
list,<o:p></o:p></span></p>
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<p class="MsoNormal"><span
style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span
style="font-size:12.0pt;color:black">I have a couple of
questions on index translator implementation.<o:p></o:p></span></p>
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<li class="MsoNormal"
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<span style="color:black">Why does gluster need callstub
and a different worker queue (and thread) to process
those call stubs? Is it just to lower the priority of
fops of internal inodes?</span></li>
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As far as I know, this is to move the processing to background and
free up the server thread to process other requests.<br>
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What’s the purpose of “link-count” in xdata? It’s being
used only in index_fstat and index_lookup. I see sometimes
the key is assigned 0/1 after callback, and sometimes AFR
uses it to store flag GF_XATTROP_INDEX_COUNT. Is the code
purposely reusing the key?</li>
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<p>A non-zero link count means there are entries that are pending
heal. AFR requests this information in lookup and fstat fops and
updates priv->need_heal in the fop-callbacks. It then uses that
information to not nullify the inodes of the entries fetched
during a readdirp call, improving readdirp performance. <br>
</p>
<p><a class="moz-txt-link-freetext" href="https://review.gluster.org/#/c/glusterfs/+/12507/">https://review.gluster.org/#/c/glusterfs/+/12507/</a> is the patch
that introduced it. <br>
</p>
HTH,<br>
Ravi<br>
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<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Thanks,<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Junsong<o:p></o:p></p>
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<pre class="moz-quote-pre" wrap="">_______________________________________________
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