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<div class="moz-cite-prefix">On 10/09/2013 11:22 AM, Pruner, Anne
(Anne) wrote:<br>
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<div class="WordSection1">
<p class="MsoNormal"><span style="font-size:10.0pt">I’m
evaluating gluster for use in our product, and I want to
ensure that I understand the failover behavior. What I’m
seeing isn’t great, but it doesn’t look from the docs I’ve
read that this is what everyone else is experiencing. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt">Is this
normal? <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt">Setup: <o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l1 level1 lfo2"><!--[if !supportLists]--><span
style="font-size:10.0pt"><span style="mso-list:Ignore">-<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span
style="font-size:10.0pt">one volume, distributed, replicated
(2), with two bricks on two different servers<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l1 level1 lfo2"><!--[if !supportLists]--><span
style="font-size:10.0pt"><span style="mso-list:Ignore">-<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span
style="font-size:10.0pt">35,000 files on volume, about 1MB
each, all in one directory (I’m open to changing this, if
that’s the problem. ls –l takes a
<i>really</i> long time)<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l1 level1 lfo2"><!--[if !supportLists]--><span
style="font-size:10.0pt"><span style="mso-list:Ignore">-<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span
style="font-size:10.0pt">volume is mounted (mount –t
gluster) on server 1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt">Procedure:<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l2 level1 lfo3"><!--[if !supportLists]--><span
style="font-size:10.0pt"><span style="mso-list:Ignore">-<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span
style="font-size:10.0pt">I stop glusterd and glusterfsd on
server1, and send a few files to the volume. This is fine.
I can write and read the files.<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l2 level1 lfo3"><!--[if !supportLists]--><span
style="font-size:10.0pt"><span style="mso-list:Ignore">-<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span
style="font-size:10.0pt">I start glusterd on server1, and
this starts glusterfsd. This triggers self-heal.<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l2 level1 lfo3"><!--[if !supportLists]--><span
style="font-size:10.0pt"><span style="mso-list:Ignore">-<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span
style="font-size:10.0pt">Send a file to the server, and try
to read it.<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l2 level1 lfo3"><!--[if !supportLists]--><span
style="font-size:10.0pt"><span style="mso-list:Ignore">-<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span
style="font-size:10.0pt">Sending takes a <b>
couple of minutes</b>. Reading is immediate. <o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l2 level1 lfo3"><!--[if !supportLists]--><span
style="font-size:10.0pt"><span style="mso-list:Ignore">-<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span
style="font-size:10.0pt">Once self-heal is done, subsequent
sends and reads are immediate.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt">I tried
profiling this operation, and it seems like it’s stuck on
locking the file:<o:p></o:p></span></p>
</div>
</blockquote>
[Profiling deleted]<br>
<blockquote
cite="mid:6AA4F6FA5BFDE5459413820369BE163711C662@AZ-US1EXMB02.global.avaya.com"
type="cite">
<div class="WordSection1">
<p class="MsoNormal" style="margin-left:.25in"><o:p> </o:p></p>
<p class="MsoNormal">Any ideas? <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal">Anne<o:p></o:p></p>
<br>
</div>
</blockquote>
What I suspect is happening is those 35k files are all being checked
for self-heal before the directory can be regarded as clean and
ready to lock. An easy way to test this would be to try writing to a
file in a nearly empty directory and see if you get the same
results.<br>
<br>
If you are using a current kernel, or a EL kernel with current
backports, mounting with use-readdirp=on will make directory reads
faster. Not sure how much faster with 35k files though. Would be
interested in finding out.<br>
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