{"action":"created","comment":{"url":"https://api.github.com/repos/palantir/atlasdb/pulls/comments/90835049","pull_request_review_id":11348692,"id":90835049,"diff_hunk":"@@ -0,0 +1,112 @@\n+=================================\n+Multinode Cassandra HA Guarantees\n+=================================\n+\n+A multinode Cassandra cluster can generally be in one of three states:\n+\n+    1. All nodes are up.\n+    #. Nodes down, but there is a quorum of up nodes (more than half the nodes are up).","path":"docs/source/configuration/multinode_cassandra.rst","position":8,"original_position":8,"commit_id":"481a3ae8322f73278bee3303877323d421931dab","original_commit_id":"481a3ae8322f73278bee3303877323d421931dab","user":{"login":"gsheasby","id":15610492,"avatar_url":"https://avatars.githubusercontent.com/u/15610492?v=3","gravatar_id":"","url":"https://api.github.com/users/gsheasby","html_url":"https://github.com/gsheasby","followers_url":"https://api.github.com/users/gsheasby/followers","following_url":"https://api.github.com/users/gsheasby/following{/other_user}","gists_url":"https://api.github.com/users/gsheasby/gists{/gist_id}","starred_url":"https://api.github.com/users/gsheasby/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/gsheasby/subscriptions","organizations_url":"https://api.github.com/users/gsheasby/orgs","repos_url":"https://api.github.com/users/gsheasby/repos","events_url":"https://api.github.com/users/gsheasby/events{/privacy}","received_events_url":"https://api.github.com/users/gsheasby/received_events","type":"User","site_admin":false},"body":"It's a little more complex than that, if you allow cases where the RF is less than the number of nodes.\r\n\r\nFor example, if you have a 7 node cluster with RF3, you can still only afford to have one node down to guarantee quorum (although quorum writes _may_ succeed with two nodes down, provided your data is not on both nodes). Bumping the RF to 5 means you can have two nodes down, but only with RF 7 can you have three nodes 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