{"action":"created","issue":{"url":"https://api.github.com/repos/scylladb/scylla/issues/1638","repository_url":"https://api.github.com/repos/scylladb/scylla","labels_url":"https://api.github.com/repos/scylladb/scylla/issues/1638/labels{/name}","comments_url":"https://api.github.com/repos/scylladb/scylla/issues/1638/comments","events_url":"https://api.github.com/repos/scylladb/scylla/issues/1638/events","html_url":"https://github.com/scylladb/scylla/issues/1638","id":174437143,"number":1638,"title":" question about commit log total size","user":{"login":"infordb","id":10610884,"avatar_url":"https://avatars.githubusercontent.com/u/10610884?v=3","gravatar_id":"","url":"https://api.github.com/users/infordb","html_url":"https://github.com/infordb","followers_url":"https://api.github.com/users/infordb/followers","following_url":"https://api.github.com/users/infordb/following{/other_user}","gists_url":"https://api.github.com/users/infordb/gists{/gist_id}","starred_url":"https://api.github.com/users/infordb/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/infordb/subscriptions","organizations_url":"https://api.github.com/users/infordb/orgs","repos_url":"https://api.github.com/users/infordb/repos","events_url":"https://api.github.com/users/infordb/events{/privacy}","received_events_url":"https://api.github.com/users/infordb/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/scylladb/scylla/labels/bug","name":"bug","color":"eb6420"}],"state":"open","locked":false,"assignee":{"login":"elcallio","id":7113590,"avatar_url":"https://avatars.githubusercontent.com/u/7113590?v=3","gravatar_id":"","url":"https://api.github.com/users/elcallio","html_url":"https://github.com/elcallio","followers_url":"https://api.github.com/users/elcallio/followers","following_url":"https://api.github.com/users/elcallio/following{/other_user}","gists_url":"https://api.github.com/users/elcallio/gists{/gist_id}","starred_url":"https://api.github.com/users/elcallio/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/elcallio/subscriptions","organizations_url":"https://api.github.com/users/elcallio/orgs","repos_url":"https://api.github.com/users/elcallio/repos","events_url":"https://api.github.com/users/elcallio/events{/privacy}","received_events_url":"https://api.github.com/users/elcallio/received_events","type":"User","site_admin":false},"assignees":[{"login":"elcallio","id":7113590,"avatar_url":"https://avatars.githubusercontent.com/u/7113590?v=3","gravatar_id":"","url":"https://api.github.com/users/elcallio","html_url":"https://github.com/elcallio","followers_url":"https://api.github.com/users/elcallio/followers","following_url":"https://api.github.com/users/elcallio/following{/other_user}","gists_url":"https://api.github.com/users/elcallio/gists{/gist_id}","starred_url":"https://api.github.com/users/elcallio/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/elcallio/subscriptions","organizations_url":"https://api.github.com/users/elcallio/orgs","repos_url":"https://api.github.com/users/elcallio/repos","events_url":"https://api.github.com/users/elcallio/events{/privacy}","received_events_url":"https://api.github.com/users/elcallio/received_events","type":"User","site_admin":false}],"milestone":null,"comments":9,"created_at":"2016-09-01T05:02:43Z","updated_at":"2016-09-01T12:26:27Z","closed_at":null,"body":"*Installation details*\r\nScylla version (or git commit hash): 1.3\r\nCluster size: 3 node\r\nOS (CentOS)\r\n16Core / 32G memory / HDD\r\n\r\nHi\r\nI have a question about commit log total size\r\nWe are testing HDD based performance\r\nTest result said that scylldb generated more commit log than cassandra and lower performance\r\nScylladb met disk bottleneck  in spite of lower TPS , I guess It depends on commit log total size....  \r\nI guess Scylladb stores more data in commit log than cassandra...\r\nCould you explain this result?\r\n\r\n1. test result\r\n > cassandra performance is better than scylla\r\n > scylladb generate more commit log than cassandra \r\n > We specified lower Thread count on ScyllaDB Because of disk bottleneck.\r\n > We specified commitlog uncompressed mode in cassandra\r\n![image](https://cloud.githubusercontent.com/assets/10610884/18155811/19352c18-704c-11e6-931a-03366322fbdb.png)\r\n\r\n\r\n2. Stress tool Config\r\nscylladb command\r\ncassandra-stress user cl=QUORUM duration=1m profile=/root/nmon/cqlstress-example.yaml  ops\\(insert=8,range1=2\\) -mode native cql3 -port native=50006 thrift=9165 -rate threads=50 -node 70.60.31.157,70.60.31.158,70.60.31.159\r\n\r\ncassandra command \r\ncassandra-stress user cl=QUORUM duration=1m profile=/root/nmon/cqlstress-example.yaml  ops\\(insert=8,range1=2\\) -mode native cql3 -port native=50006 thrift=9165 -rate threads=100 -node 70.60.31.157,70.60.31.158,70.60.31.159\r\n\r\n\r\n"},"comment":{"url":"https://api.github.com/repos/scylladb/scylla/issues/comments/244062990","html_url":"https://github.com/scylladb/scylla/issues/1638#issuecomment-244062990","issue_url":"https://api.github.com/repos/scylladb/scylla/issues/1638","id":244062990,"user":{"login":"avikivity","id":1017210,"avatar_url":"https://avatars.githubusercontent.com/u/1017210?v=3","gravatar_id":"","url":"https://api.github.com/users/avikivity","html_url":"https://github.com/avikivity","followers_url":"https://api.github.com/users/avikivity/followers","following_url":"https://api.github.com/users/avikivity/following{/other_user}","gists_url":"https://api.github.com/users/avikivity/gists{/gist_id}","starred_url":"https://api.github.com/users/avikivity/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/avikivity/subscriptions","organizations_url":"https://api.github.com/users/avikivity/orgs","repos_url":"https://api.github.com/users/avikivity/repos","events_url":"https://api.github.com/users/avikivity/events{/privacy}","received_events_url":"https://api.github.com/users/avikivity/received_events","type":"User","site_admin":false},"created_at":"2016-09-01T12:26:26Z","updated_at":"2016-09-01T12:26:26Z","body":"Sharding causes seeks for sure, but on the other hand we have a lot of concurrency so a lot of back-to-back writes can be merged."}}
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