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THOMAS Carriero: M蓹n Thomas Carriero deyil蓹m.

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M蓹n Dropbox bir proqram m眉h蓹ndis oldum.

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>> ALEX Allain: M蓹n Alex Allain deyil蓹m.

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Burada Dropbox bir m眉h蓹ndis deyil蓹m.

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>> THOMAS Carriero: B蓹li, m蓹n
h蓹qiq蓹t蓹n CS50 眉莽眉n ilk ba艧 TF

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David Malin sinif g枚t眉rd眉 zaman.

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M蓹n art谋q t蓹dris edilmi艧dir
Iki semestr 眉莽眉n CS50

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olan Mike Smith il蓹
orada 蓹vv蓹l professor.

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>> ALEX Allain: M蓹n h蓹qiq蓹t蓹n etm蓹di
CS50 almaq, amma TF bunu iki d蓹f蓹 etdi.

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Bir m眉nt蓹z蓹m TF kimi,
v蓹 sonra m蓹nim b枚y眉k il

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M蓹n, h蓹qiq蓹t蓹n, ba艧 TF idi
Fun bir 莽ox olan CS50.

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THOMAS Carriero: Bel蓹 ki,
David h蓹yata g蓹ldikd蓹

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m蓹n蓹 yarad谋lmas谋 haqq谋nda
CS50 cihaz Dropbox,

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M蓹n, h蓹qiq蓹t蓹n, heyecan, 莽眉nki
biz, h蓹qiq蓹t蓹n, bir Linux m眉艧t蓹ri var,

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bel蓹 ki, bizim istifad蓹莽il蓹r 蓹ks蓹riyy蓹ti ya istifad蓹
Windows v蓹 ya Macintosh m眉艧t蓹ril蓹r,

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lakin Linux, Macintosh v蓹 Windows
m眉艧t蓹ril蓹r蓹 b眉t眉n h蓹qiq蓹t蓹n 莽ox ox艧ard谋r.

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>> Bel蓹 ki, n蓹 biz biz 枚nceden g枚t眉rm眉艧 edir
Bu CS50 Dropbox Linux m眉艧t蓹ri

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cihaz v蓹 bu, yaln谋z kimi 莽al谋艧谋r
dig蓹r Linux users b眉t眉n.

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>> ALEX Allain: Bel蓹 ki,
Dropbox i艧l蓹yir yolu deyil

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莽ox m眉xt蓹lif bir m眉艧t蓹ri kimi 莽al谋艧谋r
蓹m蓹liyyat sisteml蓹ri v蓹 cihazlar.

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Bu Dropbox masa 眉st眉 m眉艧t蓹ri
蓹n m蓹艧hur biri,

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v蓹 蓹n maraql谋 biridir.

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>> THOMAS Carriero: Bel蓹 Dropbox
蓹sas蓹n b眉t眉n fayllar谋 edir

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Siz qovluq qoymaq v蓹 chunks ki,
bu fayllar谋 d枚rd MB chunks daxil.

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Bel蓹 ki, biz 100-meqabayt almaq laz谋md谋r
PDF file v蓹 biz will

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y谋臒谋n 25 d枚rd-megabayt chunks onu.

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H蓹min chunks sonra 艧ifreli v蓹
sonra biz blok server onlar谋 g枚nd蓹rin.

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>> ALEX Allain: The blok serverl蓹r
bloklar谋 枚zl蓹ri 眉莽眉n storage,

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v蓹 h蓹r blok saxlan谋l谋r
m蓹lumatlar谋 il蓹 blok server

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v蓹 ki, blok bir Shaw 356 hash.

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Ki, ibtidai bir 莽ox 蓹sas 艧ifreleme var
ki, m眉蓹yy蓹n m蓹nada, 眉mumil蓹艧dirir,

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bir 莽ox unikal 艧蓹kild蓹 m蓹lumat
ki, data unikal var.

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>> Siz y眉klemek bil蓹r
b眉t眉n bir d蓹f蓹 b眉t眉n fayl,

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lakin 蓹g蓹r bu 莽谋x谋r
ki, h蓹qiq蓹t蓹n b枚y眉k fayllar谋 almaq

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y眉klemek 眉莽眉n bir h蓹qiq蓹t蓹n uzun zaman v蓹 蓹g蓹r
bir u臒ursuzluq var, siz u臒urlar bitti

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v蓹 siz yenid蓹n ba艧lad谋n laz谋md谋r.

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>> B蓹s n蓹 biz dem蓹k deyil
bizim sistemind蓹 ba艧qa server,

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v蓹 n蓹 biz metadata z蓹ng
server ki, hey bu, bir fayl

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v蓹 ibar蓹t olub
bloklar谋n谋n siyah谋s谋 a艧a臒谋dak谋.

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V蓹 biz hashes q蓹d蓹r ke莽m蓹k
h蓹min bloklar谋 m眉蓹yy蓹n etm蓹k

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daha 莽ox yenid蓹n uploading
b眉t眉n blok.

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The metaserver sonra
blok serverl蓹r yoxlay谋r,

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bloklar谋 var 蓹min edir.

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Onlar m眉k蓹mm蓹l varsa.

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H蓹r 艧ey yax艧谋d谋r.

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>> THOMAS Carriero: biz
蓹sas蓹n download ist蓹yir蓹m

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internet fayl, ed蓹k
dem蓹k, biz son metaserver dem蓹k laz谋md谋r

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ilk, hey siz m蓹n蓹 dey蓹 bil蓹rsiniz
Bu fayl yerl蓹艧ir 脺 haqq谋nda?

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V蓹 metaserver dem蓹k, oh bu fayl谋n ed蓹c蓹k
h蓹qiq蓹t蓹n 25 d枚rd-megabayt chunks,

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v蓹 burada onlar.

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V蓹 sonra biz bir blok server getm蓹k laz谋md谋r
h蓹qiq蓹t蓹n bu chunks h蓹r download.

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V蓹 sonra biz yenid蓹n qurulmas谋 laz谋md谋r
fayl oradan,

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v蓹 biz download ba艧lamaq laz谋md谋r.

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茝qdl蓹rin B蓹li, bel蓹 Dropbox
miqyasl谋 蓹sas蓹n

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莽ox, 莽ox aqressiv sharding.

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>> ALEX Allain: zaman Sharding edir
ba艧lan臒谋c istifad蓹莽il蓹r b眉t眉n almaq

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v蓹 ya 艧irk蓹t v蓹 b蓹lk蓹 onlar
bir bazas谋nda olmaq 眉莽眉n istifad蓹,

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v蓹 sizin q蓹d蓹r b枚y眉k 莽al谋艧谋r
istifad蓹莽i m眉蓹yy蓹n edib.

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V蓹 h蓹qiq蓹t蓹n ist蓹diyiniz n蓹
etm蓹k 眉莽眉n bir yol tapmaq edir

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iki aras谋nda o split
m蓹lumat bazalar谋, v蓹 ya b蓹lk蓹 daha iki.

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Siz ki, ideal, kifay蓹t q蓹d蓹r
D眉nyada h蓹r istifad蓹莽i var.

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>> V蓹 bel蓹 ki, qanad眉st眉 zaman
n蓹 siz edir

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h蓹lledici b蓹zi yol tapmaq
bazas谋 getm蓹k 眉莽眉n

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ki, t蓹l蓹b etmir
m蓹rk蓹zi kataloq vuru艧.

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V蓹 ya b蓹lk蓹 bu, bir 莽ox s眉r蓹tli var
ucuz g枚z-up m蓹rk蓹zi directory.

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>> THOMAS Carriero: Biz he莽 vaxt
bir bazas谋nda saxlan谋l谋r h蓹r 艧ey,

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dem蓹k olar ki, 莽眉nki
miqyasl谋 ged蓹n he莽 vaxt.

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Bel蓹 ki, 蓹v蓹zin蓹, biz n蓹 ed蓹c蓹yik b眉t眉n almaq edir
m蓹lumat ki, b眉t眉n fayllar谋

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metadata saxlan谋l谋r,
y眉zl蓹rl蓹 aras谋nda qanad眉st眉

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v蓹 ya m蓹ntiqi veril蓹nl蓹r bazas谋 min ev.

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V蓹 o dem蓹kdir ki, biz bir zaman
bir istifad蓹莽i m蓹lumat 眉莽眉n t蓹l蓹b,

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biz ilk dem蓹k laz谋md谋r hey bazas谋
Bu istifad蓹莽inin informasiya saxlan谋l谋r?

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Sonra biz 蓹sas蓹n will
getm蓹k 眉莽眉n q蓹rar istifad蓹

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ki, veril蓹nl蓹r bazas谋 tapmaq
v蓹 oldu臒u biz will

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b眉t眉n fayllar谋 v蓹 ya b眉t眉n y眉k
fayllar谋 haqq谋nda metadata.

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>> Bel蓹likl蓹, biz sharding 莽ox istifad蓹.

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Amma sharding h蓹mi艧蓹 kifay蓹t q蓹d蓹r deyil.

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Siz, h蓹qiq蓹t蓹n, cache laz谋md谋r
眉mumi sor臒ular谋n bir 莽ox,

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莽眉nki h蓹tta bazas谋
queries bahal谋 ola bil蓹r

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bel蓹 ki, biz d蓹 aqressiv ele bunu
蓹min 蓹n etm蓹k 眉莽眉n strategiyalar

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眉mumi sor臒u var
hesablamaq 眉莽眉n olduqca asan.

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V蓹 蓹sas蓹n bir 莽ox edir
daha s眉r蓹tli v蓹 bu ex miqyasl谋 i艧 edir.

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Bel蓹 ki, bir 莽ox da var
Dropbox nec蓹 y眉ks蓹k s蓹viyy蓹d蓹.

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>> ALEX Allain: M蓹n Alex Allain deyil蓹m.

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>> THOMAS Carriero: And
M蓹n Thomas Carriero deyil蓹m.

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ALEX Allain: Bu CS50 edir.

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