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AWS DynamoDB Accelerator (DAX) 101
Kenju Wagatsuma
February 14, 2020
Programming
2
4.8k
AWS DynamoDB Accelerator (DAX) 101
Introduction to AWS DynamoDB Accelerator (DAX)
Kenju Wagatsuma
February 14, 2020
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Transcript
DAX 101 1 2020/2/15 Kenju Wagatsuma
DAX Wrap Up 2
DAX is… DynamoDB-specific in-memory cache store 3
[DAX] Glossary of Terms 4 5FSN %FTDSJQUJPO /PEFT "OPEFJTUIFNJOJNVNDPNQPOFOUGPSB%"9DMVTUFSl1SJNBSZOPEFzIBOEMFSFBE
XSJUFSFRVFTUTBOElSFQMJDBOPEFTzPOMZIBOEMFSFBESFRVFTUT $MVTUFST "DMVTUFSJTDPNQPTFEGSPN OPEFT 1BSBNFUFS(SPVQT :PVDBODIBOHF55-CZTFUUJOHDVTUPN1BSBNFUFS(SPVQT
[DAX] Comparison to other cache store 5 %"9 &MBTUJDBDIFNFNDBDIFE JONFNPSZ
.BOBHFE ✅ ✅ 4IBSFEDBDIF ✅ ✅ #BDLFOEEBUBTPVSDF %ZOBNP%#POMZ BOZUIJOH .Z42- %JTL 31$ FUD .FUSJDT ✅ ✅ 55- ⚠ HMPCBM55- ✅ ⚠ IBSEXPSLSFRVJSFE 1FSGPSNBODF ЖdNT dNT ЖdЖ
[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
Subnet C Subnet B DAX Cluster Subnet A [DAX] Single-leader
Replication - Write 7 Primary Replica Replica
DAX Cluster [DAX] Single-leader Replication - Write 8 Primary Replica
Replica Application DynamoDB Table DynamoDB Table Write Read
DAX Cluster [DAX] Single-leader Replication - Replicate 9 Primary Replica
Replica Application DynamoDB Table DynamoDB Table Write Read
DAX Cluster [DAX] Single-leader Replication - Read 10 Primary Replica
Replica Application DynamoDB Table DynamoDB Table Write Read
[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)
[DAX] Item Cache / Query Cache 12 Item Cache Query
Cache Operation GetItem / BatchGetItem Query / Scan Metrics ItemCacheHits/ItemCacheMisses QueryCacheHits/QueryCacheMisses ScanCacheHits/ScanCacheMisses
[DAX] Write Strategy - Write-Through 13 #write #read Application DAX
DynamoDB Application DAX DynamoDB
[DAX] Write Strategy - Write-Around 14 #write #read Application DynamoDB
Application DAX DynamoDB
[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
[DAX] Within VPC + Multi-A/Z 16
[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.
Monitoring 18
[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
[Monitoring] CloudWatch Metrics 20 NFUSJDT EFTDSJQUJPO 5ISPUUMJOH3FRVFTU$PVOU PGSFRVFTUTUISPUUMFECZUIFOPEFPSDMVTUFS ⚠5ISPUUMFEBU%"95ISPUUMFEBU%ZOBNP%# 'BJMFE3FRVFTU$PVOU
PGSFRVFTUTUIBUSFTVMUFEJOBOFSSPSSFQPSUFE ⚠&SSPS3FR$PVOU5ISPUUMFE 'BJMFE
[Monitoring] CloudWatch Metrics 21 NFUSJDT EFTDSJQUJPO &WJDUFE4J[F ⚠*G$BDIF)JU3BUJP&WJDUFE4J[FJTHSPXJOH UIF XPSLJOHTFUNJHIUJODSFBTF4IPVMEDPOTJEFSTDBMFVQ
$MJFOU$POOFDUJPOT PGTJNVMUBOFPVTDPOOFDUJPOTGSPNDMJFOUT ⚠$MJFOU$PO$PVOU㲈PG3VOOJOH5BTLT
[Monitoring] Grafana 22
[Monitoring] SLI/SLO 23
Alerting 24
[Alerting] CW Alarm - Infrastructure 25 CW Alarm SNS Topic
Lambda Slack
[Alerting] CW Alarm - CPUUtilization 26
[Alerting] CW Alarm - Cache Hit Ratio 27 ItemCacheHitRatio =
ItemCacheHits / ( ItemCacheHits + ItemCacheMisses )
[Alerting] CW Alarm - Cache Hit Ratio 28
[Alerting] DAX Events - Infrastructure 29 DAX Event SNS Topic
Lambda Slack
[Alerting] DAX Events - Infrastructure 30 failure/success in adding a
node changes to the security groups