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<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-US style='font-size:
10.0pt;font-family:Tahoma'>Dear All,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-US style='font-size:
10.0pt;font-family:Tahoma'> We would
like to setup mogilefs in multiple location datacenters (e.g. <st1:country-region
w:st="on">USA</st1:country-region> and <st1:place w:st="on"><st1:country-region
w:st="on">Japan</st1:country-region></st1:place>). Following is a simple
structure:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-US style='font-size:
10.0pt;font-family:Tahoma'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-US style='font-size:
10.0pt;font-family:Tahoma'> <st1:country-region
w:st="on"><st1:place w:st="on">USA</st1:place></st1:country-region>:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-US style='font-size:
10.0pt;font-family:Tahoma'> MySQL
Master database<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-US style='font-size:
10.0pt;font-family:Tahoma'> Tracker01
server<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-US style='font-size:
10.0pt;font-family:Tahoma'> Storage01
server<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-US style='font-size:
10.0pt;font-family:Tahoma'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-US style='font-size:
10.0pt;font-family:Tahoma'> <st1:country-region
w:st="on"><st1:place w:st="on">Japan</st1:place></st1:country-region>:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-US style='font-size:
10.0pt;font-family:Tahoma'> MySQL
Slave database<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-US style='font-size:
10.0pt;font-family:Tahoma'> Tracker02
server<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-US style='font-size:
10.0pt;font-family:Tahoma'> Storage02
server<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-US style='font-size:
10.0pt;font-family:Tahoma'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-US style='font-size:
10.0pt;font-family:Tahoma'> I got two
questions here:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-US style='font-size:
10.0pt;font-family:Tahoma'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:42.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><font
size=2 face=Tahoma><span lang=EN-US style='font-size:10.0pt;font-family:Tahoma'><span
style='mso-list:Ignore'>1.<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]><font
size=2 face=Tahoma><span lang=EN-US style='font-size:10.0pt;font-family:Tahoma'>If
a user from <st1:country-region w:st="on">Japan</st1:country-region> uploading
a file to Tracker02 server in <st1:country-region w:st="on"><st1:place w:st="on">Japan</st1:place></st1:country-region>.
Will the Tracker02 server “CREATE_OPEN” in Storage02 server
first?? Is there a “priority” storage list for specific tracker?<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:42.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><font
size=2 face=Tahoma><span lang=EN-US style='font-size:10.0pt;font-family:Tahoma'><span
style='mso-list:Ignore'>2.<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]><font
size=2 face=Tahoma><span lang=EN-US style='font-size:10.0pt;font-family:Tahoma'>If
user upload a 50MB file to Storage02 through Tracker<st1:chmetcnv TCSC="0"
NumberType="1" Negative="False" HasSpace="True" SourceValue="2" UnitName="in"
w:st="on">02 in</st1:chmetcnv> <st1:country-region w:st="on"><st1:place w:st="on">Japan</st1:place></st1:country-region>.
Immediately, a user from <st1:country-region w:st="on"><st1:place w:st="on">USA</st1:place></st1:country-region>,
request a “GET_PATHS” from Tracker01, I know Tracker01 will return
Storage02, since it takes some time to replicate to Storage01. How about
AFTER the replication is finished? Can Tracker01 return Storage01 as
first priority since user is coming from <st1:place w:st="on"><st1:country-region
w:st="on">USA</st1:country-region></st1:place>?<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:42.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><font
size=2 face=Tahoma><span lang=EN-US style='font-size:10.0pt;font-family:Tahoma'><span
style='mso-list:Ignore'>3.<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]><font
size=2 face=Tahoma><span lang=EN-US style='font-size:10.0pt;font-family:Tahoma'>Regarding
replication policy, if I am going to override the function “replicate_to”,
how can I plug this new class into the server? i.e. I have already
installed 2.17. Sorry, but I am a newbie in PERL…<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-US style='font-size:
10.0pt;font-family:Tahoma'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:24.0pt'><font size=2 face=Tahoma><span
lang=EN-US style='font-size:10.0pt;font-family:Tahoma'>I know some of the issues
could be resolved by using geographic load balancing. I can make sure a
user from <st1:country-region w:st="on">Japan</st1:country-region> goes to <st1:country-region
w:st="on"><st1:place w:st="on">Japan</st1:place></st1:country-region> web
server and tracker. However, I don’t know how a Tracker select it’s
storage location.<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:24.0pt'><font size=2 face=Tahoma><span
lang=EN-US style='font-size:10.0pt;font-family:Tahoma'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:24.0pt'><font size=2 face=Tahoma><span
lang=EN-US style='font-size:10.0pt;font-family:Tahoma'>Thanks for your time.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-US style='font-size:
10.0pt;font-family:Tahoma'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-US style='font-size:
10.0pt;font-family:Tahoma'>Francis Mak<o:p></o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-US
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-US
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
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