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DAX 101 1 2020/2/15 Kenju Wagatsuma

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DAX Wrap Up 2

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DAX is… DynamoDB-specific in-memory cache store 3

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[DAX] Glossary of Terms 4 5FSN %FTDSJQUJPO /PEFT "OPEFJTUIFNJOJNVNDPNQPOFOUGPSB%"9DMVTUFSl1SJNBSZOPEFzIBOEMFSFBE  XSJUFSFRVFTUTBOElSFQMJDBOPEFTzPOMZIBOEMFSFBESFRVFTUT $MVTUFST "DMVTUFSJTDPNQPTFEGSPN OPEFT 1BSBNFUFS(SPVQT :PVDBODIBOHF55-CZTFUUJOHDVTUPN1BSBNFUFS(SPVQT

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[DAX] Comparison to other cache store 5 %"9 &MBTUJDBDIFNFNDBDIFE JONFNPSZ .BOBHFE ✅ ✅  4IBSFEDBDIF ✅ ✅  #BDLFOEEBUBTPVSDF %ZOBNP%#POMZ BOZUIJOH .Z42- %JTL 31$ FUD .FUSJDT ✅ ✅  55- ⚠ HMPCBM55- ✅ ⚠ IBSEXPSLSFRVJSFE 1FSGPSNBODF ЖdNT dNT ЖdЖ

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[DAX] Single-leader Replication 6 +3 nodes for different Multi-A/Z for production Background replication (eventually consistent model) Single “primary node” handles all write requests

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Subnet C Subnet B DAX Cluster Subnet A [DAX] Single-leader Replication - Write 7 Primary Replica Replica

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DAX Cluster [DAX] Single-leader Replication - Write 8 Primary Replica Replica Application DynamoDB Table DynamoDB Table Write Read

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DAX Cluster [DAX] Single-leader Replication - Replicate 9 Primary Replica Replica Application DynamoDB Table DynamoDB Table Write Read

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DAX Cluster [DAX] Single-leader Replication - Read 10 Primary Replica Replica Application DynamoDB Table DynamoDB Table Write Read

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[DAX] Cache Algorithm 11 Least Recently Used (LRU) cache Negative cache also implemented Eviction happens when items are taken & cache is full Global Time-To-Live (TTL)

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[DAX] Item Cache / Query Cache 12 Item Cache Query Cache Operation GetItem / BatchGetItem Query / Scan Metrics ItemCacheHits/ItemCacheMisses QueryCacheHits/QueryCacheMisses ScanCacheHits/ScanCacheMisses

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[DAX] Write Strategy - Write-Through 13 #write #read Application DAX DynamoDB Application DAX DynamoDB

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[DAX] Write Strategy - Write-Around 14 #write #read Application DynamoDB Application DAX DynamoDB

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[DAX] Write Strategy 15 8SJUF5ISPVHI 8SJUF"SPVOE 1SPT 4ZODISPOJ[FEJUFNTCFUXFFO%"9 BOE%ZOBNP%# 8SJUFDBOTDBMF FHCVMLVQEBUF $POT ☹8SJUFPQFSBUJPOIBTPWFSIFBE ☹*UFNTDBOCFJODPOTJTUFOU JGPUIFS BQQXSJUFUP%ZOBNP%#EJSFDUMZ ☹&WFOUVBMMZ$POTJTUFOU JUFNTJO%"9 OPEFTDBOCFPVUEBUFE

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[DAX] Within VPC + Multi-A/Z 16

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[DAX] Limitation 17 Maximum nodes is 10 (1 primary node + ~9 replica nodes) Maximum nodes is 50 per Region. Maximum Parameter Groups is 20 per Region Maximum DAX Subnet Groups is 50 per Region. Maximum subnets per groups is 20.

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Monitoring 18

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[Monitoring] CloudWatch Metrics 19 NFUSJDT EFTDSJQUJPO $166UJMJ[BUJPO PG$16VUJMJ[BUJPOUTNBMMVTFW$16 ⚠:PVOFFEUPTDBMFVQJGUIJTNFUSJDTJTTBUVSBUFE *UFN$BDIF)JUT *UFN$BDIF.JTTFT $BMDVMBUF$BDIF)JU3BUJP  GSPNUIFTFNFUSJDT ⚠*UFN$BDIF2VFSZ$BDIF

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[Monitoring] CloudWatch Metrics 20 NFUSJDT EFTDSJQUJPO 5ISPUUMJOH3FRVFTU$PVOU PGSFRVFTUTUISPUUMFECZUIFOPEFPSDMVTUFS ⚠5ISPUUMFEBU%"95ISPUUMFEBU%ZOBNP%# 'BJMFE3FRVFTU$PVOU PGSFRVFTUTUIBUSFTVMUFEJOBOFSSPSSFQPSUFE ⚠&SSPS3FR$PVOU5ISPUUMFE 'BJMFE

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[Monitoring] CloudWatch Metrics 21 NFUSJDT EFTDSJQUJPO &WJDUFE4J[F ⚠*G$BDIF)JU3BUJP&WJDUFE4J[FJTHSPXJOH UIF XPSLJOHTFUNJHIUJODSFBTF4IPVMEDPOTJEFSTDBMFVQ $MJFOU$POOFDUJPOT PGTJNVMUBOFPVTDPOOFDUJPOTGSPNDMJFOUT ⚠$MJFOU$PO$PVOU㲈PG3VOOJOH5BTLT

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[Monitoring] Grafana 22

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[Monitoring] SLI/SLO 23

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Alerting 24

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[Alerting] CW Alarm - Infrastructure 25 CW Alarm SNS Topic Lambda Slack

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[Alerting] CW Alarm - CPUUtilization 26

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[Alerting] CW Alarm - Cache Hit Ratio 27 ItemCacheHitRatio = ItemCacheHits / ( ItemCacheHits + ItemCacheMisses )

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[Alerting] CW Alarm - Cache Hit Ratio 28

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[Alerting] DAX Events - Infrastructure 29 DAX Event SNS Topic Lambda Slack

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[Alerting] DAX Events - Infrastructure 30 failure/success in adding a node changes to the security groups