cql - cassandra read performance is bad -


i have 1 table contains 8 millions rows data in cassandra3.10. when did query follow : select max(glass_id) poc.dream time < '2017-04-01 00:00:00+0000' allow filtering ; time property partition key of table , data size selected 70 millions. bad performance reading, took 2mins result.

the primary key pk(time,glass_id);

the part of tracing log showed follow:

preparing statement [native-transport-requests-1] | 2017-04-07 14:58:55.598000 | 172.19.16.44 |            247 | 127.0.0.1  computing ranges query [native-transport-requests-1] | 2017-04-07 14:58:55.599000 | 172.19.16.44 |            771 | 127.0.0.1 range_slice message received /172.19.16.44 [messagingservice-incoming-/172.19.16.44] | 2017-04-07 14:58:55.599000 | 172.19.20.89 |             40 | 127.0.0.1 submitting range requests on 769 ranges concurrency of 1 (0.0 rows per range expected) [native-transport-requests-1] | 2017-04-07 14:58:55.599000 | 172.19.16.44 |            862 | 127.0.0.1 enqueuing request /172.19.20.89 [native-transport-requests-1] | 2017-04-07 14:58:55.599000 | 172.19.16.44 |            881 | 127.0.0.1 submitted 1 concurrent range requests [native-transport-requests-1] | 2017-04-07 14:58:55.599000 | 172.19.16.44 |            899 | 127.0.0.1 sending range_slice message /172.19.20.89 [messagingservice-outgoing-/172.19.20.89-small] | 2017-04-07 14:58:55.599000 | 172.19.16.44 |            937 | 127.0.0.1 executing seq scan across 0 sstables (min(-9223372036854775808), max(-9222003595370030342)] [readstage-1] | 2017-04-07 14:58:55.600000 | 172.19.20.89 |            369 | 127.0.0.1 read 0 live , 0 tombstone cells [readstage-1] | 2017-04-07 14:58:55.600000 | 172.19.20.89 |            517 | 127.0.0.1 enqueuing response /172.19.16.44 [readstage-1] | 2017-04-07 14:58:55.600000 | 172.19.20.89 |            575 | 127.0.0.1 sending request_response message /172.19.16.44 [messagingservice-outgoing-/172.19.16.44-small] | 2017-04-07 14:58:55.600000 | 172.19.20.89 |            977 | 127.0.0.1 request_response message received /172.19.20.89 [messagingservice-incoming-/172.19.20.89] | 2017-04-07 14:58:55.601000 | 172.19.16.44 |           3018 | 127.0.0.1 processing response /172.19.20.89 [requestresponsestage-2] | 2017-04-07 14:58:55.601000 | 172.19.16.44 |           3090 | 127.0.0.1 enqueuing request /172.19.20.5 [native-transport-requests-1] | 2017-04-07 14:58:55.601000 | 172.19.16.44 |           3168 | 127.0.0.1 enqueuing request /172.19.20.5 [native-transport-requests-1] | 2017-04-07 14:58:55.601000 | 172.19.16.44 |           3198 | 127.0.0.1 enqueuing request /172.19.20.89 [native-transport-requests-1] | 2017-04-07 14:58:55.601000 | 172.19.16.44 |           3210 | 127.0.0.1 sending range_slice message /172.19.20.5 [messagingservice-outgoing-/172.19.20.5-small] | 2017-04-07 14:58:55.601000 | 172.19.16.44 |           3210 | 127.0.0.1 enqueuing request /172.19.20.5 [native-transport-requests-1] | 2017-04-07 14:58:55.601001 | 172.19.16.44 |           3222 | 127.0.0.1 enqueuing request /172.19.20.89 [native-transport-requests-1] | 2017-04-07 14:58:55.601001 | 172.19.16.44 |           3230 | 127.0.0.1 sending range_slice message /172.19.20.89 [messagingservice-outgoing-/172.19.20.89-small] | 2017-04-07 14:58:55.601001 | 172.19.16.44 |           3232 | 127.0.0.1 enqueuing request /172.19.20.89 [native-transport-requests-1] | 2017-04-07 14:58:55.601001 | 172.19.16.44 |           3240 | 127.0.0.1 sending range_slice message /172.19.20.5 [messagingservice-outgoing-/172.19.20.5-small] | 2017-04-07 14:58:55.601001 | 172.19.16.44 |           3247 | 127.0.0.1 enqueuing request /172.19.20.5 [native-transport-requests-1] | 2017-04-07 14:58:55.601001 | 172.19.16.44 |           3249 | 127.0.0.1 enqueuing request /172.19.20.89 [native-transport-requests-1] | 2017-04-07 14:58:55.601001 | 172.19.16.44 |           3257 | 127.0.0.1 enqueuing request /172.19.20.5 [native-transport-requests-1] | 2017-04-07 14:58:55.601001 | 172.19.16.44 |           3264 | 127.0.0.1 sending range_slice message /172.19.20.5 [messagingservice-outgoing-/172.19.20.5-small] | 2017-04-07 14:58:55.601002 | 172.19.16.44 |           3267 | 127.0.0.1 executing seq scan across 0 sstables (max(-9153807552532774465), max(-9087147317664915466)] [readstage-2] | 2017-04-07 14:58:55.601002 | 172.19.16.44 |           3273 | 127.0.0.1 enqueuing request /172.19.20.89 [native-transport-requests-1] | 2017-04-07 14:58:55.601002 | 172.19.16.44 |           3273 | 127.0.0.1 sending range_slice message /172.19.20.89 [messagingservice-outgoing-/172.19.20.89-small] | 2017-04-07 14:58:55.601002 | 172.19.16.44 |           3274 | 127.0.0.1 enqueuing request /172.19.20.89 [native-transport-requests-1] | 2017-04-07 14:58:55.601002 | 172.19.16.44 |           3285 | 127.0.0.1 executing seq scan across 0 sstables (max(-9072913252686483927), max(-9071905664525634895)] [readstage-4] | 2017-04-07 14:58:55.601002 | 172.19.16.44 |           3284 | 127.0.0.1 sending range_slice message /172.19.20.5 [messagingservice-outgoing-/172.19.20.5-small] | 2017-04-07 14:58:55.601002 | 172.19.16.44 |           3290 | 127.0.0.1 enqueuing request /172.19.20.89 [native-transport-requests-1] | 2017-04-07 14:58:55.601002 | 172.19.16.44 |           3294 | 127.0.0.1 sending range_slice message /172.19.20.89 [messagingservice-outgoing-/172.19.20.89-small] | 2017-04-07 14:58:55.601002 | 172.19.16.44 |           3296 | 127.0.0.1 enqueuing request /172.19.20.89 [native-transport-requests-1] | 2017-04-07 14:58:55.601002 | 172.19.16.44 |           3304 | 127.0.0.1 sending range_slice message /172.19.20.5 [messagingservice-outgoing-/172.19.20.5-small] | 2017-04-07 14:58:55.601002 | 172.19.16.44 |           3307 | 127.0.0.1 enqueuing request /172.19.20.89 [native-transport-requests-1] | 2017-04-07 14:58:55.601002 | 172.19.16.44 |           3313 | 127.0.0.1 sending range_slice message /172.19.20.89 [messagingservice-outgoing-/172.19.20.89-small] | 2017-04-07 14:58:55.601003 | 172.19.16.44 |           3319 | 127.0.0.1 enqueuing request /172.19.20.5 [native-transport-requests-1] | 2017-04-07 14:58:55.601003 | 172.19.16.44 |           3321 | 127.0.0.1 read 0 live , 0 tombstone cells [readstage-4] | 2017-04-07 14:58:55.601003 | 172.19.16.44 |           3323 | 127.0.0.1 read 0 live , 0 tombstone cells [readstage-2] | 2017-04-07 14:58:55.601003 | 172.19.16.44 |           3323 | 127.0.0.1

you doing 2 things wrong in single query.

first : have not specified partition key cassandra needs execute query on each , every node

second : using aggregate method max(), scan row (for case 70 millions row) give max number.

instead of using such query, change data model can specify partition key , specify glass_id clustering key order desc.


Comments

Post a Comment

Popular posts from this blog

Command prompt result in label. Python 2.7 -

i want put result(output) of shell command label. command works, label shows "0", however, in command prompt, result shown correctly, need showed in label. doing ubuntu. myg1 = button(root, text="rodyti informacija", command=lambda: gauti()) myg1.pack(side=bottom) def gauti(): imti = tekstas.get("1.0", "end-1c") info = subprocess.call("id '{imti}' ".format(imti=imti), shell=true) w = label(root, text= info) w.pack(side = bottom) subprocess.call() returns exit code of process created (in case 0 success). if want text output of process, should instead call subprocess.check_output() .
Read more

javascript - How do I use URL parameters to change link href on page? -

i change href value of link using url parameters. example: default <a id="dlink" href="link-1">link</a> but, when user goes https://url.com/?dlink=link-2 it swaps out link new link <a id="dlink" href="link-2">link</a> first need value url. if you're not using javascript framework can create function using jquery. please check get url parameter jquery or how query string values in js it. after that, element "a" id , set value there. $("#dlink").attr("href", hreffromparam);
Read more

amazon web services - AWS Route53 Trying To Get Site To Resolve To www -

so have domain nameservers pointed aws route 53. site hosted on ec2 instance , reachable resolves site.com, if input www.site.com. i'm curious how site resolve www.site.com. have under route53 domains hosted zone 2 additional record sets outside of ns , soa: a site.com ec2 elastic ip cname www.site.com ec2 public dns i can reach site using both site.com , www.site.com, resolve site.com. there way make if enter either, resolves www.site.com? at first, both should record set. a site.com ec2 elastic ip www.site.com ec2 elastic ip and need redirect setting in web server (nginx, apache, ..) following. (source: how redirect www non-www nginx on centos 7 ) redirect non-www www if want redirect users plain, non-www domain www domain, add server block: server { server_name example.com; return 301 $scheme://www.example.com$request_uri; } save , exit. configures nginx redirect requests "example.com" "www.example.com". not...
Read more