{"id":75892,"date":"2020-03-29T01:43:46","date_gmt":"2020-03-28T23:43:46","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/mikroservisy-kombinatornyj-vzryv-versij"},"modified":"2020-03-29T01:43:46","modified_gmt":"2020-03-28T23:43:46","slug":"mikroservisy-kombinatornyj-vzryv-versij","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/administrirovanie\/mikroservisy-kombinatornyj-vzryv-versij","title":{"rendered":"Mikroslu\u017eby \u2013 kombinatorick\u00e1 expl\u00f3zia verzi\u00ed","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Ahoj, Habr! Predstavujem v\u00e1m autorsk\u00fd preklad \u010dl\u00e1nku Mikroslu\u017eby \u2013 Kombinatorick\u00e1 expl\u00f3zia verzi\u00ed<\/a><\/noindex>.<\/i>
\n\"Mikroslu\u017eby
\nV \u010dase, ke\u010f sa svet IT postupne pren\u00e1\u0161a na mikroslu\u017eby a n\u00e1stroje ako Kubernetes, st\u00e1va sa \u010doraz zjavnej\u0161\u00edm len jeden probl\u00e9m. Tento probl\u00e9m je kombinatorick\u00e1 expl\u00f3zia<\/a><\/noindex> verzi\u00ed mikroslu\u017eieb. Napriek tomu IT komunita pova\u017euje s\u00fa\u010dasn\u00fa situ\u00e1ciu za podstatne lep\u0161iu ne\u017e \u00bbDependency hell\u00ab<\/a><\/noindex> predch\u00e1dzaj\u00facej gener\u00e1cie technol\u00f3gi\u00ed. Napriek tomu je spr\u00e1va verzi\u00ed mikroslu\u017eieb ve\u013emi zlo\u017eit\u00fdm probl\u00e9mom. Jedn\u00fdm z d\u00f4kazov m\u00f4\u017eu by\u0165 \u010dl\u00e1nky ako \u00bbVr\u00e1\u0165te mi m\u00f4j monolit\u00ab<\/a><\/noindex>.
\n<\/a><\/noindex>
\nAk zatia\u013e nerozumiete probl\u00e9mu, dovo\u013ete mi vysvetli\u0165. Predpokladajme, \u017ee v\u00e1\u0161 produkt pozost\u00e1va z 10 mikroslu\u017eieb. Teraz predpokladajme, \u017ee pre ka\u017ed\u00fa z t\u00fdchto mikroslu\u017eieb vyjde 1 nov\u00e1 verzia. Iba 1 verzia \u2014 d\u00fafam, \u017ee sa v\u0161etci m\u00f4\u017eeme zhodn\u00fa\u0165, \u017ee je to ve\u013emi trivi\u00e1lny a nepodstatn\u00fd fakt. Teraz sa v\u0161ak pozrime e\u0161te raz na n\u00e1\u0161 produkt. S jednou novou verziou ka\u017ed\u00e9ho komponentu m\u00e1me teraz 2^10 \u2014 alebo 1024 permut\u00e1ci\u00ed toho, ako m\u00f4\u017ee by\u0165 n\u00e1\u0161 produkt zlo\u017een\u00fd.<\/p>\n

Ak e\u0161te st\u00e1le zost\u00e1va nepochopenie, dovo\u013ete mi rozlo\u017ei\u0165 matematiku. Tak\u017ee m\u00e1me 10 mikroslu\u017eieb, ka\u017ed\u00e1 dost\u00e1va jedno aktualiz\u00e1ciu. To znamen\u00e1, \u017ee dostaneme 2 mo\u017en\u00e9 verzie pre ka\u017ed\u00fa mikroslu\u017ebu (bu\u010f star\u00fa, alebo nov\u00fa). Teraz, pre ka\u017ed\u00fd z komponentov produktu m\u00f4\u017eeme pou\u017ei\u0165 ktor\u00fako\u013evek z t\u00fdchto dvoch verzi\u00ed. Matematicky, to je rovnak\u00e9, ako keby sme mali dvojkov\u00e9 \u010d\u00edslo z 10 znakov. Povedzme, \u017ee 1 \u2014 to je nov\u00e1 verzia, a 0 \u2014 star\u00e1 verzia \u2014 potom jedna mo\u017en\u00e1 permut\u00e1cia m\u00f4\u017ee by\u0165 ozna\u010den\u00e1 ako 1001000000 \u2014 kde 1. a 4. komponent sa aktualizovali, a v\u0161etky ostatn\u00e9 nie. Z matematiky vieme, \u017ee dvojkov\u00e9 \u010d\u00edslo z 10 znakov m\u00f4\u017ee ma\u0165 2^10 alebo 1024 hodn\u00f4t. Teda potvrdili sme rozsah \u010d\u00edsla, s ktor\u00fdm sa zaober\u00e1me.<\/p>\n

Pokra\u010dujme v \u00favahe \u010falej \u2014 \u010do sa stane, ak budeme ma\u0165 100 mikroslu\u017eieb a ka\u017ed\u00e1 10 mo\u017en\u00fdch verzi\u00ed? Cel\u00e1 situ\u00e1cia sa st\u00e1va ve\u013emi nepr\u00edjemnou \u2014 teraz m\u00e1me 10^100 permut\u00e1ci\u00ed \u2014 a to je obrovsk\u00e9 \u010d\u00edslo. Napriek tomu preferujem nazva\u0165 t\u00fato situ\u00e1ciu t\u00fdmto sp\u00f4sobom, preto\u017ee teraz sa neskr\u00fdvame za slov\u00e1 ako \u201ekubernetes\u201c, ale \u010del\u00edme probl\u00e9mu tak, ako je.<\/p>\n

Pre\u010do ma t\u00e1to problematika tak fascinuje? \u010ciasto\u010dne preto, \u017ee ke\u010f som nakoniec pracoval vo svete NLP a AI, ve\u013ea sme diskutovali o probl\u00e9me kombinatorickej expl\u00f3zie niekde pred 5-6 rokmi. Len namiesto verzi\u00ed sme mali jednotliv\u00e9 slov\u00e1, a namiesto produktov sme mali vety a odstavce. A hoci probl\u00e9my v NLP a AI zost\u00e1vaj\u00fa do zna\u010dnej miery nevyrie\u0161en\u00e9, treba uzna\u0165, \u017ee za posledn\u00fdch nieko\u013eko rokov sa dosiahol v\u00fdrazn\u00fd pokrok. (pod\u013ea m\u00f4jho n\u00e1zoru by pokrok mohol by\u0165o<\/b>v\u00e4\u010d\u0161\u00ed, keby sa \u013eudia v odvetv\u00ed trocha menej s\u00fastredili na strojov\u00e9 u\u010denie a trocha viac na in\u00e9 techniky \u2013 ale to u\u017e je off-topic).<\/i><\/p>\n

Vr\u00e1tim sa do sveta DevOps a mikroslu\u017eieb. Pred nami stoj\u00ed obrovsk\u00fd probl\u00e9m, maskuj\u00faci sa ako slon v Kunstkammer \u2014 ve\u010f \u010do \u010dasto po\u010dujem \u2014 \u201elen vezmi Kubernetes a Helm, a v\u0161etko bude v poriadku!\u201c Ale nie, v\u0161etko nebude v poriadku, ak to v\u0161etko nech\u00e1me tak. Navy\u0161e, analytick\u00e9 rie\u0161enie tohto probl\u00e9mu sa nezd\u00e1 by\u0165 prijate\u013en\u00e9 z d\u00f4vodu jeho zlo\u017eitosti. Rovnako ako v NLP, mali by sme sa najprv pr\u00edstupova\u0165 k tejto probl\u00e9me z\u00fa\u017een\u00edm vyh\u013ead\u00e1vacej oblasti \u2014 v tomto pr\u00edpade vyl\u00fa\u010den\u00edm zastaran\u00fdch permut\u00e1ci\u00ed.<\/p>\n

Jedna z vec\u00ed, ktor\u00e1 m\u00f4\u017ee pom\u00f4c\u0165 \u2014 minul\u00fd rok som p\u00edsal o potrebe udr\u017eiava\u0165 minim\u00e1lny rozptyl medzi verziami, ktor\u00e9 s\u00fa zverejnen\u00e9 pre klientov<\/a><\/noindex>. Rovnako je d\u00f4le\u017eit\u00e9 poznamena\u0165, \u017ee dobre navrhnut\u00fd proces CI\/CD ve\u013emi pom\u00e1ha pri zni\u017eovan\u00ed vari\u00e1ci\u00ed. Av\u0161ak, s\u00fa\u010dasn\u00fd stav v CI\/CD nie je dostato\u010dne dobr\u00fd na rie\u0161enie probl\u00e9mu permut\u00e1ci\u00ed bez dodato\u010dn\u00fdch n\u00e1strojov na sledovanie a evidenciu komponentov.<\/p>\n

\u010co potrebujeme \u2014 je syst\u00e9m experimentov v \u0161t\u00e1diu integr\u00e1cie, kde by sme mohli ur\u010di\u0165 faktor rizika pre ka\u017ed\u00fd komponent, a tie\u017e ma\u0165 automatizovan\u00fd proces aktualiz\u00e1cie r\u00f4znych komponentov a testovania bez z\u00e1sahu oper\u00e1tora \u2014 aby sme videli, \u010do funguje a \u010do nie.<\/p>\n

Tak\u00fdto syst\u00e9m experimentov by mohol vyzera\u0165 nasledovne:<\/p>\n

    \n
  1. V\u00fdvoj\u00e1ri p\u00ed\u0161u testy (to je kritick\u00fd krok \u2014 preto\u017ee inak nem\u00e1me hodnotiaci kriterium \u2014 to je ako ozna\u010dovanie d\u00e1t v strojovom u\u010den\u00ed).<\/li>\n
  2. Ka\u017ed\u00fd komponent (projekt) dostane svoju vlastn\u00fa CI syst\u00e9m \u2014 tento proces je v s\u00fa\u010dasnosti dobre prepracovan\u00fd, a ot\u00e1zka vytvorenia CI syst\u00e9mu pre jedin\u00fd komponent je vo ve\u013ekej miere vyrie\u0161en\u00e1.<\/li>\n
  3. \u201eInteligentn\u00fd integra\u010dn\u00fd syst\u00e9m\u201c zhroma\u017e\u010fuje v\u00fdsledky r\u00f4znych CI syst\u00e9mov a sp\u00e1ja komponenty projektov do kone\u010dn\u00e9ho produktu, sp\u00fa\u0161\u0165a testovanie a nakoniec vypo\u010d\u00edta najkrat\u0161iu cestu k dosiahnutiu po\u017eadovanej funk\u010dnosti produktu na z\u00e1klade existuj\u00facich komponentov a rizikov\u00fdch faktorov. Ak nie je mo\u017en\u00e9 vykona\u0165 aktualiz\u00e1ciu, tento syst\u00e9m upozor\u0148uje v\u00fdvoj\u00e1rov na existuj\u00face komponenty a na tom, na ktorom z nich doch\u00e1dza k chybe. E\u0161te raz pripom\u00ednam, \u017ee testovac\u00ed syst\u00e9m tu m\u00e1 kritick\u00fa d\u00f4le\u017eitos\u0165 \u2014 preto\u017ee integra\u010dn\u00fd syst\u00e9m pou\u017e\u00edva testy ako krit\u00e9rium hodnotenia.<\/li>\n
  4. CD syst\u00e9m, ktor\u00fd potom prij\u00edma d\u00e1ta z \u201eInteligentn\u00e9ho integra\u010dn\u00e9ho syst\u00e9mu\u201c a vykon\u00e1va samotn\u00fa aktualiz\u00e1ciu. T\u00e1to f\u00e1za uzatv\u00e1ra cyklus.<\/li>\n<\/ol>\n

    \nZhrnuj\u00faci povedan\u00e9, pre m\u0148a je jednou z najv\u00e4\u010d\u0161\u00edch probl\u00e9mov teraz absencia takej \u201eInteligentnej integra\u010dnej\u201c syst\u00e9mu, ktor\u00fd by spojil r\u00f4zne komponenty do produktu a t\u00fdm umo\u017enil sledova\u0165, ak\u00fdm sp\u00f4sobom je produkt v celku zlo\u017een\u00fd. Zauj\u00edmaj\u00fa ma n\u00e1zory komunity na t\u00fato t\u00e9mu (spoiler \u2014 moment\u00e1lne pracujem na projekte Reliza<\/a><\/noindex>, ktor\u00fd by mohol by\u0165 tak\u00fdm inteligentn\u00fdm integra\u010dn\u00fdm syst\u00e9mom).<\/p>\n

    Jedna posledn\u00e1 vec, ktor\u00fa chcem spomen\u00fa\u0165, \u2014 pre m\u0148a nie je monolit prijate\u013en\u00fd pre ktor\u00fdko\u013evek projekt aspo\u0148 strednej ve\u013ekosti. M\u00e1m ve\u013ek\u00e9 pochybnosti o pokusoch ur\u00fdchli\u0165 \u010das realiz\u00e1cie a kvalitu v\u00fdvoja t\u00fdm, \u017ee sa vr\u00e1time k monolitu. Po prv\u00e9, monolit m\u00e1 podobn\u00fd probl\u00e9m riadenia komponentov \u2014 medzi r\u00f4znymi kni\u017enicami, z ktor\u00fdch sa sklad\u00e1, av\u0161ak v\u0161etko toto nie je tak zjavn\u00e9 a prejavuje sa predov\u0161etk\u00fdm v \u010dase, ktor\u00fd v\u00fdvoj\u00e1ri str\u00e1caj\u00fa. D\u00f4sledkom probl\u00e9mu monolitu je faktick\u00e1 nemo\u017enos\u0165 vykon\u00e1va\u0165 zmeny v k\u00f3de \u2014 a extr\u00e9mne pomal\u00e1 r\u00fdchlos\u0165 v\u00fdvoja.<\/p>\n

    Mikroslu\u017eby zlep\u0161uj\u00fa situ\u00e1ciu, av\u0161ak potom sa mikroslu\u017ebov\u00e1 architekt\u00fara stret\u00e1va s probl\u00e9mom kombinatorick\u00e9ho v\u00fdbuchu v f\u00e1ze integr\u00e1cie. \u00c1no, vo v\u0161eobecnosti sme presunuli rovnak\u00fd probl\u00e9m \u2014 z f\u00e1zy v\u00fdvoja na f\u00e1zu integr\u00e1cie. Av\u0161ak, pod\u013ea m\u00f4jho n\u00e1zoru, pr\u00edstup mikroslu\u017eieb st\u00e1le vedie k lep\u0161\u00edm v\u00fdsledkom a t\u00edmy dosahuj\u00fa v\u00fdsledky r\u00fdchlej\u0161ie (pravdepodobne najm\u00e4 kv\u00f4li zmen\u0161ovaniu ve\u013ekosti jednotky v\u00fdvoja \u2014 alebo batch size<\/i>). Av\u0161ak prechod od monolitu k mikroslu\u017eb\u00e1m zatia\u013e neposkytol dostato\u010dn\u00e9 zlep\u0161enie procesu \u2014 kombinatorick\u00fd v\u00fdbuch verzi\u00ed mikroslu\u017eieb je obrovsk\u00fd probl\u00e9m a m\u00e1me ve\u013ek\u00fd potenci\u00e1l na zlep\u0161enie situ\u00e1cie, ke\u010f sa to za\u010dne rie\u0161i\u0165.
    \n
    Zdroj:     habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

    \u041f\u0440\u0438\u0432\u0435\u0442, \u0425\u0430\u0431\u0440! \u041f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u044f\u044e \u0432\u0430\u0448\u0435\u043c\u0443 \u0432\u043d\u0438\u043c\u0430\u043d\u0438\u044e \u0430\u0432\u0442\u043e\u0440\u0441\u043a\u0438\u0439 \u043f\u0435\u0440\u0435\u0432\u043e\u0434 \u0441\u0442\u0430\u0442\u044c\u0438 Microservices \u2013 Combinatorial Explosion of Versions. \u0412\u043e \u0432\u0440\u0435\u043c\u0435\u043d\u0430 \u043a\u043e\u0433\u0434\u0430 \u043c\u0438\u0440 IT \u043f\u043e\u0441\u0442\u0435\u043f\u0435\u043d\u043d\u043e \u043f\u0435\u0440\u0435\u0445\u043e\u0434\u0438\u0442 \u043d\u0430 \u043c\u0438\u043a\u0440\u043e\u0441\u0435\u0440\u0432\u0438\u0441\u044b \u0438 \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u044b \u0432\u0440\u043e\u0434\u0435 Kubernetes, \u0432\u0441\u0435 \u0431\u043e\u043b\u0435\u0435 \u0437\u0430\u043c\u0435\u0442\u043d\u043e\u0439 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[…]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":75893,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-75892","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Mikroslu\u017eby \u2014 kombinatorick\u00fd v\u00fdbuch verzi\u00ed | ProHoster","description":"Ahoj, Habr!","canonical_url":"https:\/\/prohoster.info\/sk\/blog\/administrirovanie\/mikroservisy-kombinatornyj-vzryv-versij","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"sk_SK","og:site_name":"ProHoster | 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