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charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charse=
t=3DUTF-8"><style>body { line-height: 1.5; }blockquote { margin-top: 0px; =
margin-bottom: 0px; margin-left: 0.5em; }body { font-size: 10.5pt; font-fa=
mily: 'Microsoft YaHei UI'; color: rgb(0, 0, 0); line-height: 1.5; }body {=
font-size: 10.5pt; font-family: 'Microsoft YaHei UI'; color: rgb(0, 0, 0)=
; line-height: 1.5; }</style></head><body>=0A<div><span></span>Hello</div>=
<div><br></div><div><div style=3D"font-family: 'Microsoft YaHei UI', Tahom=
a; line-height: normal;">I have tested the patch with a partition table wi=
th several foreign</div><div style=3D"font-family: 'Microsoft YaHei UI', T=
ahoma; line-height: normal;">partitions living on seperate data nodes. The=
initial testing was done</div><div style=3D"font-family: 'Microsoft YaHei=
UI', Tahoma; line-height: normal;">with a partition table having 3 foreig=
n partitions, test was done <span style=3D"font-size: 10.5pt; backgro=
und-color: transparent;">with</span></div><div style=3D"font-family: 'Micr=
osoft YaHei UI', Tahoma; line-height: normal;"><span style=3D"font-size: 1=
0.5pt; background-color: transparent;">variety of scale facters. The seonn=
d test was with fixed data </span><span style=3D"font-size: 10.5pt; b=
ackground-color: transparent;">per data</span></div><div style=3D"font-fam=
ily: 'Microsoft YaHei UI', Tahoma; line-height: normal;"><span style=3D"fo=
nt-size: 10.5pt; background-color: transparent;">node but number of data n=
odes were increased incrementally </span><span style=3D"font-size: 10=
.5pt; background-color: transparent;">to see</span></div><div style=3D"fon=
t-family: 'Microsoft YaHei UI', Tahoma; line-height: normal;"><span style=
=3D"font-size: 10.5pt; background-color: transparent;">the peformance impa=
ct as more nodes are added </span><span style=3D"font-size: 10.5pt; b=
ackground-color: transparent;">to the cluster. </span><span style=3D"=
font-size: 10.5pt; background-color: transparent;">The</span></div><div st=
yle=3D"font-family: 'Microsoft YaHei UI', Tahoma; line-height: normal;"><s=
pan style=3D"font-size: 10.5pt; background-color: transparent;">test three=
is similar to the initial test but with </span><span =
style=3D"font-size: 10.5pt; background-color: transparent;">much huge data=
and</span></div><div style=3D"font-family: 'Microsoft YaHei UI', Tahoma; =
line-height: normal;"><span style=3D"font-size: 10.5pt; background-color: =
transparent;">4 nodes.</span></div><div style=3D"font-family: 'Microsoft Y=
aHei UI', Tahoma; line-height: normal;"><br></div><div style=3D"font-famil=
y: 'Microsoft YaHei UI', Tahoma; line-height: normal;">The results are sum=
mary is given below and test script attached:</div></div><div style=3D"fon=
t-family: 'Microsoft YaHei UI', Tahoma; line-height: normal;"><br></div><d=
iv style=3D"font-family: 'Microsoft YaHei UI', Tahoma; line-height: normal=
;"><div><b>Test ENV</b></div><div>Parent node:2Core 8G</div><div>Child Nod=
es:2Core 4G</div><div><br></div><div><br></div></div><div style=3D"font-fa=
mily: 'Microsoft YaHei UI', Tahoma; line-height: normal;"><div><b>Test one=
:</b></div><div><br></div><div>1.1 The partition struct as below:</div><di=
v><br></div><div> [ ptf:(a int, b int, c varchar)]</div><div> &=
nbsp; (Parent node)</div><div> | &n=
bsp; | &nbs=
p; |</div><div> [ptf1] [ptf2] &nbs=
p; [ptf3]</div><div> (Node1) (Node2) (Node3=
)</div><div><br></div><div>The table data is partitioned across nodes, the=
test is done using a</div><div>simple <span style=3D"font-size: 10.5=
pt; background-color: transparent;">select query and a count aggregat=
e as shown below. The result</span></div><div><span style=3D"font-siz=
e: 10.5pt; background-color: transparent;">is an </span><span style=
=3D"font-size: 10.5pt; background-color: transparent;">average </span=
><span style=3D"font-size: 10.5pt; background-color: transparent;">of exec=
uting each query multiple times to ensure reliable</span></div><div><span =
style=3D"font-size: 10.5pt; background-color: transparent;">and </spa=
n><span style=3D"font-size: 10.5pt; background-color: transparent;">consis=
tent </span><span style=3D"font-size: 10.5pt; background-color: trans=
parent;">results.</span></div><div><br></div><div>=E2=91=A0select * from p=
tf where b =3D 100;</div><div>=E2=91=A1select count(*) from ptf;</div=
><div><br></div><div><div>1.2. Test Results</div><div><br></div><div><b>&n=
bsp;</b>For =E2=91=A0 result:</div><div> sc=
alepernode master patched performa=
nce</div><div> 2G &nbs=
p; 7s &nb=
sp; 2s &=
nbsp; 350%</div><div> &=
nbsp; 5G &n=
bsp; 173s 63s  =
; 275%</div><div> &=
nbsp; 10G &=
nbsp; 462s 156s &nb=
sp; 296%</div><div> =
20G =
968s 327s &=
nbsp; 296%</div><div> =
30G =
1472s 494s &=
nbsp;297%</div><div> </d=
iv><div><b> </b>For =E2=91=A1 result:</div><div> =
scalepernode master patched &n=
bsp; performance</div><div> 2G&nbs=
p; =
1079s 291s &nbs=
p; 370%</div><div> 5G =
&n=
bsp; 2688s 741s 36=
2%</div><div> 10G &nbs=
p; 4473s =
1493s 299%</div><div><br></div><=
div>It takes too long time to test a aggregate so the test was done w=
ith a</div><div>smaller <span style=3D"font-size: 10.5pt; background-=
color: transparent;">data size.</span></div></div><div><br></div><div><br>=
</div><div><div>1.3. summary</div><div><br></div><div>With the table parti=
tioned over 3 nodes, the average performance gain</div><div>across variety=
of scale factors is almost 300%</div></div></div>=0A<div><br></div><div><=
br></div><div><div style=3D"font-family: 'Microsoft YaHei UI', Tahoma; lin=
e-height: normal;"><b>Test Two</b></div><div style=3D"font-family: 'Micros=
oft YaHei UI', Tahoma; line-height: normal;"><b></b></div><div style=3D"fo=
nt-family: 'Microsoft YaHei UI', Tahoma; line-height: normal;">2.1 The par=
tition struct as below:</div><div style=3D"font-family: 'Microsoft YaHei U=
I', Tahoma; line-height: normal;"><br></div><div style=3D"font-family: 'Mi=
crosoft YaHei UI', Tahoma; line-height: normal;"> [ ptf:(a int, b int=
, c varchar)]</div><div style=3D"font-family: 'Microsoft YaHei UI', Tahoma=
; line-height: normal;"> (Parent node)</div><div style=
=3D"font-family: 'Microsoft YaHei UI', Tahoma; line-height: normal;"> =
; | |  =
; |</div><div style=3D"font-family: 'Mi=
crosoft YaHei UI', Tahoma; line-height: normal;"> [ptf1] &nbs=
p; ... [ptfN]</div><div style=3D"=
font-family: 'Microsoft YaHei UI', Tahoma; line-height: normal;"> (No=
de1) (...) (NodeN)</div><div style=3D"fon=
t-family: 'Microsoft YaHei UI', Tahoma; line-height: normal;"><br></div><d=
iv style=3D"font-family: 'Microsoft YaHei UI', Tahoma; line-height: normal=
;">=E2=91=A0select * from ptf</div><div style=3D"font-family: 'Microsoft Y=
aHei UI', Tahoma; line-height: normal;">=E2=91=A1select * from ptf where b=
=3D 100;</div><div style=3D"font-family: 'Microsoft YaHei UI', Tahoma; li=
ne-height: normal;"><br></div><div style=3D"font-family: 'Microsoft YaHei =
UI', Tahoma; line-height: normal;">This test is done with same size of dat=
a per node but table is partitioned</div><div style=3D"font-family: 'Micro=
soft YaHei UI', Tahoma; line-height: normal;">across <span style=3D"f=
ont-size: 10.5pt; background-color: transparent;">N number </span><sp=
an style=3D"font-size: 10.5pt; background-color: transparent;">of nodes.&n=
bsp;Each varation (master or patches) is tested</span></div><div style=3D"=
font-family: 'Microsoft YaHei UI', Tahoma; line-height: normal;"><span sty=
le=3D"font-size: 10.5pt; background-color: transparent;">at-least 3 times&=
nbsp;</span><span style=3D"font-size: 10.5pt; background-color: transparen=
t;">to get reliable and </span><span style=3D"font-size: 10.5pt; back=
ground-color: transparent;">consistent results. The purpose of the</span><=
/div><div style=3D"font-family: 'Microsoft YaHei UI', Tahoma; line-height:=
normal;"><span style=3D"font-size: 10.5pt; background-color: transparent;=
">test is to see impact on </span><span style=3D"font-size: 10.5pt; b=
ackground-color: transparent;">performance as number of </span><span =
style=3D"font-size: 10.5pt; background-color: transparent;">data nodes are=
increased.</span></div></div><div><br></div><div><div style=3D"font-famil=
y: 'Microsoft YaHei UI', Tahoma; line-height: normal;"><span style=3D"colo=
r: rgb(80, 0, 80);">2.2 The results</span></div><div style=3D"font-family:=
'Microsoft YaHei UI', Tahoma; line-height: normal;"><br></div><div style=
=3D"line-height: normal;"><font face=3D"Microsoft YaHei UI, Tahoma">For =
=E2=91=A0 result=EF=BC=88scalepernode=3D2G=EF=BC=89:</font></div><div styl=
e=3D"font-family: 'Microsoft YaHei UI', Tahoma; line-height: normal;"><spa=
n style=3D"color: rgb(80, 0, 80);"><span style=3D"color: rgb(0, 0, 0);">&n=
bsp; nodenumber master patched  =
; performance</span></span></div><div style=3D"font-family: 'Microsoft YaH=
ei UI', Tahoma; line-height: normal;"><span style=3D"color: rgb(80, 0, 80)=
;"><span style=3D"color: rgb(0, 0, 0);"> &n=
bsp; 2 &nb=
sp; 432s 180s  =
; 240%</span></span></div><div style=3D"f=
ont-family: 'Microsoft YaHei UI', Tahoma; line-height: normal;"><span styl=
e=3D"color: rgb(80, 0, 80);"><span style=3D"color: rgb(0, 0, 0);"> &=
nbsp; 3  =
; 636s =
223s &nbs=
p;285%</span></span></div><div style=3D"font-family: 'Microsoft YaHei UI',=
Tahoma; line-height: normal;"><span style=3D"color: rgb(80, 0, 80);"><spa=
n style=3D"color: rgb(0, 0, 0);"> &nb=
sp; 4 =
830s 283s &=
nbsp; 293%</span></span></div><div style=
=3D"line-height: normal;"><span style=3D"font-family: 'Microsoft YaHei UI'=
, Tahoma; color: rgb(0, 0, 0);"> &nbs=
p; 5 &=
nbsp; 1065s 361s &nb=
sp; </span><font face=3D"Microsoft YaHei UI, Tahoma">&n=
bsp; 295%</font></div><div style=3D"line-height: normal;"></div><div=
style=3D"line-height: normal;"><font face=3D"Microsoft YaHei UI, Tahoma">=
For =E2=91=A1 result=EF=BC=88scalepernode=3D10G=EF=BC=89:</font></div><div=
style=3D"line-height: normal;"><font face=3D"Microsoft YaHei UI, Tahoma">=
nodenumber master patched &nb=
sp; performance</font></div><div style=3D"line-height: normal;"><font face=
=3D"Microsoft YaHei UI, Tahoma"> &nbs=
p; 2  =
;281s 140s =
201%</font></div><div style=3D"font-family: 'Mic=
rosoft YaHei UI', Tahoma; line-height: normal;"><span style=3D"color: rgb(=
80, 0, 80);"><span style=3D"color: rgb(0, 0, 0);">  =
; 3 &n=
bsp; 421s 140s&nbs=
p; 300%</span></span></=
div><div style=3D"font-family: 'Microsoft YaHei UI', Tahoma; line-height: =
normal;"><span style=3D"color: rgb(80, 0, 80);"><span style=3D"color: rgb(=
0, 0, 0);"> =
4 562s &nbs=
p; 141s &nb=
sp; 398%</span></span></div><div style=3D"font-family: 'Microsoft Ya=
Hei UI', Tahoma; line-height: normal;"><span style=3D"color: rgb(80, 0, 80=
);"><span style=3D"color: rgb(0, 0, 0);"> &=
nbsp; 5 &nbs=
p; 702s 141s =
497%</span></span></div><div =
style=3D"font-family: 'Microsoft YaHei UI', Tahoma; line-height: normal;">=
<span style=3D"color: rgb(80, 0, 80);"><span style=3D"color: rgb(0, 0, 0);=
"> 6 =
833s &=
nbsp; 139s  =
;599%</span></span></div><div style=3D"font-family: 'Microsoft YaHei UI', =
Tahoma; line-height: normal;"><span style=3D"color: rgb(80, 0, 80);"><span=
style=3D"color: rgb(0, 0, 0);"> &nbs=
p; 7 =
986s 141s =
699%</span></span></div><div style=3D"font-famil=
y: 'Microsoft YaHei UI', Tahoma; line-height: normal;"><span style=3D"colo=
r: rgb(80, 0, 80);"><span style=3D"color: rgb(0, 0, 0);"> &nbs=
p; 8 =
1125s 140s &=
nbsp; 803%</span></span></div>=
</div><div style=3D"font-family: 'Microsoft YaHei UI', Tahoma; line-height=
: normal;"><span style=3D"color: rgb(80, 0, 80);"><span style=3D"color: rg=
b(0, 0, 0);"><br></span></span></div><div style=3D"font-family: 'Microsoft=
YaHei UI', Tahoma; line-height: normal;"><span style=3D"color: rgb(80, 0,=
80);"><span style=3D"color: rgb(0, 0, 0);"><br></span></span></div><div s=
tyle=3D"font-family: 'Microsoft YaHei UI', Tahoma; line-height: normal;"><=
b>Test Three</b></div><div style=3D"font-family: 'Microsoft YaHei UI', Tah=
oma; line-height: normal;"><span style=3D"color: rgb(80, 0, 80);"><span st=
yle=3D"color: rgb(0, 0, 0);"><br></span></span></div><div><div><span style=
=3D"font-size: 10.5pt; line-height: 1.5; background-color: transparent;">T=
his test is similar to the [test one] but with </span><span style=3D"=
font-size: 10.5pt; line-height: 1.5; background-color: transparent;">much =
huge data and </span></div><div><span style=3D"font-size: 10.5pt; lin=
e-height: 1.5; background-color: transparent;">4 nodes.</span></div><div><=
div><span style=3D"font-size: 10.5pt; line-height: 1.5; background-color: =
transparent;"><br></span></div><div><span style=3D"font-size: 10.5pt; line=
-height: 1.5; background-color: transparent;">For =E2=91=A0 result:</span>=
</div><div><span style=3D"color: rgb(0, 0, 0); font-size: 10.5pt; line-hei=
ght: 1.5; background-color: rgba(0, 0, 0, 0);"> scalepernode =
master</span><span style=3D"color: rgb(0, 0, 0); font-size: 1=
0.5pt; line-height: 1.5; background-color: rgba(0, 0, 0, 0);">  =
; patched performance</span></div><div><span style=3D"font-s=
ize: 10.5pt; line-height: 1.5; background-color: transparent;"> &nbs=
p; 100G </sp=
an><span style=3D"font-size: 10.5pt; line-height: 1.5; background-color: t=
ransparent;">6592</span><span style=3D"font-size: 10.5pt; line-height: 1.5=
; background-color: transparent;">s </span><span=
style=3D"font-size: 10.5pt; line-height: 1.5; background-color: transpare=
nt;">1649</span><span style=3D"font-size: 10.5pt; line-height: 1.5; backgr=
ound-color: transparent;">s 399%</span></div><=
div>For =E2=91=A1 result:</div><div> <span style=3D"colo=
r: rgb(0, 0, 0); font-size: 10.5pt; line-height: 1.5; background-color: rg=
ba(0, 0, 0, 0);">scalepernode master</span><span style=3D"col=
or: rgb(0, 0, 0); font-size: 10.5pt; line-height: 1.5; background-color: r=
gba(0, 0, 0, 0);"> patched</span><span style=3D"font-size: 10=
..5pt; line-height: 1.5; background-color: transparent;"> </span><span=
style=3D"font-size: 10.5pt; line-height: 1.5; background-color: transpare=
nt;"> performance</span></div><div><span style=3D"font-size: =
10.5pt; line-height: 1.5; background-color: transparent;"> &n=
bsp; 100G 35383 &nb=
sp; 12363 286%</span></div><div><=
span style=3D"font-size: 10.5pt; line-height: 1.5; background-color: trans=
parent;">The result show it work well in much huge data.</span></div></div=
></div><div><span style=3D"font-size: 10.5pt; line-height: 1.5; background=
-color: transparent;"><br></span></div><div><span style=3D"font-size: 10.5=
pt; line-height: 1.5; background-color: transparent;"><br></span></div><di=
v><div style=3D"font-family: 'Microsoft YaHei UI', Tahoma; line-height: no=
rmal;"><b>Summary</b></div><div style=3D"font-family: 'Microsoft YaHei UI'=
, Tahoma; line-height: normal;"><b></b></div><div style=3D"font-family: 'M=
icrosoft YaHei UI', Tahoma; line-height: normal;">The patch is pretty good=
, it works well when there were little data <span style=3D"font-size:=
10.5pt; background-color: transparent;">back to</span></div><div style=3D=
"font-family: 'Microsoft YaHei UI', Tahoma; line-height: normal;"><span st=
yle=3D"font-size: 10.5pt; background-color: transparent;">the parent node.=
The patch doesn=E2=80=99t provide parallel FDW scan, it ensures</span></d=
iv><div style=3D"font-family: 'Microsoft YaHei UI', Tahoma; line-height: n=
ormal;"><span style=3D"font-size: 10.5pt; background-color: transparent;">=
that </span><span style=3D"font-size: 10.5pt; background-color: trans=
parent;">child nodes can send data to parent in parallel but the&nbs=
p;parent can </span><span style=3D"font-size: 10.5pt; background=
-color: transparent;">only</span></div><div style=3D"font-family: 'Microso=
ft YaHei UI', Tahoma; line-height: normal;"><span style=3D"font-size: 10.5=
pt; background-color: transparent;">sequennly process the data from data n=
odes.</span></div><div style=3D"font-family: 'Microsoft YaHei UI', Tahoma;=
line-height: normal;"><br></div><div style=3D"font-family: 'Microsoft YaH=
ei UI', Tahoma; line-height: normal;">Providing there is no performance de=
grdation for non FDW append queries,</div><div style=3D"font-family: 'Micr=
osoft YaHei UI', Tahoma; line-height: normal;">I would recomend to conside=
r this patch as an <span style=3D"font-size: 10.5pt; background-color=
: transparent;">interim soluton while we are</span></div><div style=3D"fon=
t-family: 'Microsoft YaHei UI', Tahoma; line-height: normal;"><span style=
=3D"font-size: 10.5pt; background-color: transparent;">waiting for paralle=
l FDW scan.</span></div></div><div><span style=3D"font-size: 10.5pt; line-=
height: 1.5; background-color: transparent;"><br></span></div><div><br></d=
iv><hr style=3D"width: 210px; height: 1px;" color=3D"#b5c4df" size=3D"1" a=
lign=3D"left">=0A<div><span><div style=3D"MARGIN: 10px; FONT-FAMILY: verda=
na; FONT-SIZE: 10pt"><span style=3D"color: rgb(13, 10, 11); font-family: m=
onospace, monospace; font-size: 10.7333px; font-variant-ligatures: normal;=
orphans: 2; white-space: pre-wrap; widows: 2;">Highgo Software (Canada/Ch=
ina/Pakistan) </span><br style=3D"box-sizing: border-box; color: rgb(13, 1=
0, 11); font-family: monospace, monospace; font-size: 10.7333px; font-vari=
ant-ligatures: normal; orphans: 2; white-space: pre-wrap; widows: 2;"><spa=
n style=3D"color: rgb(13, 10, 11); font-family: monospace, monospace; font=
-size: 10.7333px; font-variant-ligatures: normal; orphans: 2; white-space:=
pre-wrap; widows: 2;">URL : </span><a href=3D"http://www.highgo.ca/" rel=
=3D"nofollow" style=3D"box-sizing: border-box; color: rgb(132, 0, 50); tex=
t-decoration: none; font-weight: 600; transition: color 0.2s ease-in-out 0=
s; font-family: monospace, monospace; font-size: 10.7333px; font-variant-l=
igatures: normal; orphans: 2; white-space: pre-wrap; widows: 2;">www.highg=
o.ca</a><span style=3D"color: rgb(13, 10, 11); font-family: monospace, mon=
ospace; font-size: 10.7333px; font-variant-ligatures: normal; orphans: 2; =
white-space: pre-wrap; widows: 2;"> </span><br style=3D"box-sizing: border=
-box; color: rgb(13, 10, 11); font-family: monospace, monospace; font-size=
: 10.7333px; font-variant-ligatures: normal; orphans: 2; white-space: pre-=
wrap; widows: 2;"><span style=3D"color: rgb(13, 10, 11); font-family: mono=
space, monospace; font-size: 10.7333px; font-variant-ligatures: normal; or=
phans: 2; white-space: pre-wrap; widows: 2;">EMAIL: mailto:movead(dot)li(a=
t)highgo(dot)ca</span></div></span></div><blockquote style=3D"margin-Top: =
0px; margin-Bottom: 0px; margin-Left: 0.5em"><div><div class=3D"FoxDiv2020=
0114163142768486"><blockquote style=3D"margin-Top: 0px; margin-Bottom: 0px=
; margin-Left: 0.5em">=0A</blockquote>=0A</div></div></blockquote>=0A</bod=
y></html>
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