{"id":103120,"date":"2022-01-28T15:37:51","date_gmt":"2022-01-28T13:37:51","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/vypusk-rqlite-7-0-raspredelyonnoj-otkazoustojchivoj-subd-na-osnove-sqlite"},"modified":"2022-01-28T15:37:51","modified_gmt":"2022-01-28T13:37:51","slug":"vypusk-rqlite-7-0-raspredelyonnoj-otkazoustojchivoj-subd-na-osnove-sqlite","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/vypusk-rqlite-7-0-raspredelyonnoj-otkazoustojchivoj-subd-na-osnove-sqlite","title":{"rendered":"Verze rqlite 7.0, distribuovan\u00e9ho odoln\u00e9ho datab\u00e1zov\u00e9ho syst\u00e9mu zalo\u017een\u00e9ho na SQLite","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Byla vyd\u00e1na distribuovan\u00e1 datab\u00e1zov\u00e1 SYST\u00c9MA rqlite 7.0, kter\u00e1 pou\u017e\u00edv\u00e1 SQLite jako \u00falo\u017ei\u0161t\u011b a umo\u017e\u0148uje organizaci pr\u00e1ci kask\u00e1dy synchronizovan\u00fdch \u00falo\u017ei\u0161\u0165. Mezi zvl\u00e1\u0161tnostmi rqlite se uv\u00e1d\u00ed snadnost instalace, nasazen\u00ed a \u00fadr\u017eby rozd\u011blen\u00e9ho odoln\u00e9ho \u00falo\u017ei\u0161t\u011b, kter\u00e9 je \u010d\u00e1ste\u010dn\u011b podobn\u00e9 etdc a Consul, ale pou\u017e\u00edv\u00e1 rela\u010dn\u00ed model pro pr\u00e1ci s daty nam\u00edsto form\u00e1tu kl\u00ed\u010d\/hodnota. K\u00f3d projektu je naps\u00e1n v jazyce Go a je distribuov\u00e1n pod licenc\u00ed MIT. <\/p>\n

Pro udr\u017een\u00ed v\u0161ech uzl\u016f ve synchronizovan\u00e9m stavu se pou\u017e\u00edv\u00e1 algoritmus dosa\u017een\u00ed konsenzu Raft. Rqlite pou\u017e\u00edv\u00e1 origin\u00e1ln\u00ed knihovnu SQLite a ovlada\u010d go-sqlite3, na nich\u017e b\u011b\u017e\u00ed vrstva, kter\u00e1 zpracov\u00e1v\u00e1 po\u017eadavky klient\u016f, prov\u00e1d\u00ed replikaci na dal\u0161\u00ed uzly a sleduje dosa\u017een\u00ed konsenzu p\u0159i v\u00fdb\u011bru vedouc\u00edho uzlu. <\/p>\n

Zm\u011bny v datab\u00e1zi mohou b\u00fdt prov\u00e1d\u011bny pouze uzlem, kter\u00fd byl zvolen jako vedouc\u00ed, av\u0161ak spojen\u00ed s operacemi z\u00e1pisu mohou b\u00fdt sm\u011b\u0159ov\u00e1na i na dal\u0161\u00ed uzly kask\u00e1dy, kter\u00e9 vr\u00e1t\u00ed adresu vedouc\u00edho pro opakov\u00e1n\u00ed po\u017eadavku (v dal\u0161\u00ed verzi slibuj\u00ed p\u0159id\u00e1n\u00ed automatick\u00e9ho p\u0159esm\u011brov\u00e1n\u00ed k vedouc\u00edmu). Hlavn\u00ed d\u016fraz je kladen na odolnost v\u016f\u010di chyb\u00e1m, proto je datab\u00e1zov\u00e1 SYST\u00c9MA \u0161k\u00e1lov\u00e1na pouze pro operace \u010dten\u00ed, zat\u00edmco operace z\u00e1pisu p\u0159edstavuj\u00ed \u00fazk\u00e9 m\u00edsto. Je mo\u017en\u00e9 spustit kask\u00e1du rqlite z jednoho uzlu a takov\u00e9 \u0159e\u0161en\u00ed m\u016f\u017ee b\u00fdt pou\u017eito pro organizaci p\u0159\u00edstupu k SQLite p\u0159es HTTP bez poskytnut\u00ed odolnosti v\u016f\u010di chyb\u00e1m. <\/p>\n

Data SQLite na ka\u017ed\u00e9m uzlu nejsou ulo\u017eena v souboru, ale v pam\u011bti. Na \u00farovni vrstvy s implementac\u00ed protokolu Raft se vede z\u00e1znam v\u0161ech p\u0159\u00edkaz\u016f SQLite, kter\u00e9 vedou ke zm\u011bn\u00e1m datab\u00e1ze. Tento z\u00e1znam se pou\u017e\u00edv\u00e1 p\u0159i replikaci (replikace na \u00farovni reprodukce po\u017eadavk\u016f na jin\u00fdch uzlech), p\u0159i spu\u0161t\u011bn\u00ed nov\u00e9ho uzlu nebo k obnoven\u00ed po ztr\u00e1t\u011b konektivity. Pro zkr\u00e1cen\u00ed velikosti z\u00e1znamu se pou\u017e\u00edv\u00e1 automatick\u00e9 balen\u00ed, kter\u00e9 se spou\u0161t\u00ed po zadan\u00e9m po\u010dtu zm\u011bn a vede k ulo\u017een\u00ed sn\u00edmku, na jeho\u017e z\u00e1klad\u011b se za\u010d\u00edn\u00e1 zaznamen\u00e1vat nov\u00fd z\u00e1znam (stav datab\u00e1ze v pam\u011bti je identick\u00fd se sn\u00edmkem + nahromad\u011bn\u00fdm z\u00e1znamem zm\u011bn). <\/p>\n

Vlastnosti rqlite: <\/p>\n