April 2025
Intermediate to advanced
552 pages
17h 42m
Italian
book
Ingegneria dell'affidabilità dei siti
by Niall Richard Murphy, Betsy Beyer, Chris Jones, Jennifer Petoff
Content preview from Ingegneria dell'affidabilità dei siti
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Capitolo 20. Bilanciamento del carico nel Datacenter
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Questo capitolo si concentra sul bilanciamento del carico all'interno del datacenter. In particolare, vengono discussi gli algoritmi per distribuire il lavoro all'interno di un dato datacenter per un flusso di query. Vengono trattate le politiche a livello di applicazione per instradare le richieste verso i singoli server in grado di elaborarle. I principi di rete di livello inferiore (ad esempio, switch, routing dei pacchetti) e la selezione dei datacenter non rientrano nell'ambito di questo capitolo.
Supponiamo che ci sia un flusso di query che arrivano al datacenter - potrebbero provenire dal datacenter stesso, da datacenter remoti o da un mix di entrambi - a una velocità che non supera le risorse che il datacenter ha per elaborarle (o che le supera solo per periodi di tempo molto brevi). Supponiamo anche che all'interno del datacenter ci siano deiservizi contro i quali queste query operano. Questi servizi sono implementati come molti processi server omogenei e intercambiabili, per lo più in esecuzione su macchine diverse. I servizi più piccoli hanno in genere almeno tre processi di questo tipo (usare meno processi significa perdere il 50% o più della capacità se si perde una sola macchina) e i più grandi possono avere più di 10.000 ...
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