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<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">>>>Can you please try and disable eager-lock?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian">Eager-lock is disabled already, and from the source code below:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian">Arbiter and data FOP will trigger FLOCK the entire file, isn’t it ?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian"><o:p> </o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian">if ((priv->arbiter_count || local->transaction.eager_lock_on ||</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt"> </span><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian"> priv->full_lock) &&</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt"> </span><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian"> local->transaction.type == AFR_DATA_TRANSACTION)
{</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt"> </span><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian"> /*Lock entire file to avoid network split brains.*/</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt"> </span><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian"> int_lock->flock.l_len</span><span lang="EN-US" style="font-size:10.5pt"> </span><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian">
= 0;</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt"> </span><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian"> int_lock->flock.l_start = 0;</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt"> </span><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian"> } else {</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian">Best Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian">George<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Yaniv Kaul <ykaul@redhat.com>
<br>
<b>Sent:</b> Friday, August 10, 2018 1:37 AM<br>
<b>To:</b> Lian, George (NSB - CN/Hangzhou) <george.lian@nokia-sbell.com><br>
<b>Subject:</b> Re: [Gluster-devel] afr_set_transaction_flock lead to bad perforance when write with multi-pthread or multi-process<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">Can you please try and disable eager-lock?<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">Y. <o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">On Thu, Aug 9, 2018, 8:01 PM Lian, George (NSB - CN/Hangzhou) <<a href="mailto:george.lian@nokia-sbell.com">george.lian@nokia-sbell.com</a>> wrote:<o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian">Hi, Gluster expert,</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt"> </span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian">When we setup replicate volume with info like the below:</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt"> </span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian">Volume Name: test</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian">Type: Replicate</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian">Volume ID: 9373eba9-eb84-4618-a54c-f2837345daec</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian">Status: Started</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian">Snapshot Count: 0</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian">Number of Bricks: 1 x (2 + 1) = 3</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian">Transport-type: tcp</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian">Bricks:</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian">Brick1: rcp:/trunk/brick/test1/sn0</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian">Brick2: rcp:/trunk/brick/test1/sn1</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian">Brick3: rcp:/trunk/brick/test1/sn2 (arbiter)</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt"> </span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian">If we run a performance test which could write a same file with multi-pthread in same time.(write different offset).
The write performance drop a lots (about 60%-70% off</span><span lang="EN-US" style="font-size:10.5pt"> </span><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian"> to the volume which no arbiter)
</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian">And when we study the source code, there is a function
</span><span style="font-size:10.5pt;font-family:DengXian">“<span lang="EN-US">afr_set_transaction_flock</span>”<span lang="EN-US"> in</span>”<span lang="EN-US"> afr-transaction.c</span>”<span lang="EN-US">,
</span></span><span lang="EN-US" style="font-size:10.5pt"> </span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian">It will flock the entire file when arbiter_count is not zero, I suppose it is the root cause lead to performance
drop.</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian">Now my question is:</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="m8044688507892569447msolistparagraph" style="margin-left:18.0pt"><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian">1)</span><span lang="EN-US" style="font-size:7.0pt;font-family:"Times New Roman",serif">
</span><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian">Why flock the entire file when arbiter is set on? Could you please share the detail why it will lead to split brain only to arbiter?</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="m8044688507892569447msolistparagraph" style="margin-left:18.0pt"><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian">2)</span><span lang="EN-US" style="font-size:7.0pt;font-family:"Times New Roman",serif">
</span><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian">If it is the root cause, and it really will lead to split-brain if not lock entire file, is there any solution to avoid performance drop for this mulit-write case?</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt"> </span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian">The following is attached source code for this function FYI:</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian">--------------------------------------------------------------------------------------</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian">int afr_set_transaction_flock (xlator_t *this, afr_local_t *local)</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian">{</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt"> </span><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian"> afr_internal_lock_t *int_lock = NULL;</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt"> </span><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian"> afr_private_t</span><span lang="EN-US" style="font-size:10.5pt"> </span><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian">
*priv</span><span lang="EN-US" style="font-size:10.5pt"> </span><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian"> = NULL;</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt"> </span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt"> </span><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian"> int_lock = &local->internal_lock;</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt"> </span><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian"> priv = this->private;</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt"> </span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt"> </span><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian"> if ((priv->arbiter_count || local->transaction.eager_lock_on
||</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt"> </span><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian"> priv->full_lock) &&</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt"> </span><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian"> local->transaction.type == AFR_DATA_TRANSACTION)
{</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt"> </span><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian"> /*Lock entire file to avoid network split brains.*/</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt"> </span><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian"> int_lock->flock.l_len</span><span lang="EN-US" style="font-size:10.5pt"> </span><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian">
= 0;</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt"> </span><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian"> int_lock->flock.l_start = 0;</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt"> </span><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian"> } else {</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt"> </span><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian"> int_lock->flock.l_len</span><span lang="EN-US" style="font-size:10.5pt"> </span><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian">
= local->transaction.len;</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt"> </span><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian"> int_lock->flock.l_start = local->transaction.start;</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt"> </span><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian"> }</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt"> </span><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian"> int_lock->flock.l_type</span><span lang="EN-US" style="font-size:10.5pt"> </span><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian">
= F_WRLCK;</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt"> </span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt"> </span><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian"> return 0;</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian">}</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian">------------------------------------------------------------------------------------</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian">Thanks & Best Regards,</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.5pt;font-family:DengXian">George</span><span lang="EN-US"><o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">_______________________________________________<br>
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