Apache Cassandra and Drivers at a high level and a dive deeper into the asynchronous api, error handling and various configurable policies of the DataStax Ruby Driver.
Replica Node Node Replica Client Client Datacenter Node Node Replica Client Client Coordinator Replica node: Stores a slice of total rows of each keyspace
= session.prepare("SELECT * FROM users WHERE id = ?") select_page = session.prepare("SELECT * FROM pages WHERE slug = ?") user_ids = [1, 2, 3, 4] futures = user_ids.map do |id| future = session.execute_async(select_user, id) future.then do |users| user = users.first future = session.execute_async(select_page, user[‘username']) future.then do |pages| page = pages.first User.new(user, Page.new(page)) end end end Cassandra::Future.all(futures).get
= session.prepare("SELECT * FROM users WHERE id = ?") select_page = session.prepare("SELECT * FROM pages WHERE slug = ?") user_ids = [1, 2, 3, 4] futures = user_ids.map do |id| future = session.execute_async(select_user, id) future.then do |users| user = users.first future = session.execute_async(select_page, user[‘username']) future.then do |pages| page = pages.first User.new(user, Page.new(page)) end end end Cassandra::Future.all(futures).get
= session.prepare("SELECT * FROM users WHERE id = ?") select_page = session.prepare("SELECT * FROM pages WHERE slug = ?") user_ids = [1, 2, 3, 4] futures = user_ids.map do |id| future = session.execute_async(select_user, id) future.then do |users| user = users.first future = session.execute_async(select_page, user[‘username']) future.then do |pages| page = pages.first User.new(user, Page.new(page)) end end end Cassandra::Future.all(futures).get
= session.prepare("SELECT * FROM users WHERE id = ?") select_page = session.prepare("SELECT * FROM pages WHERE slug = ?") user_ids = [1, 2, 3, 4] futures = user_ids.map do |id| future = session.execute_async(select_user, id) future.then do |users| user = users.first future = session.execute_async(select_page, user[‘username']) future.then do |pages| page = pages.first User.new(user, Page.new(page)) end end end Cassandra::Future.all(futures).get
= session.prepare("SELECT * FROM users WHERE id = ?") select_page = session.prepare("SELECT * FROM pages WHERE slug = ?") user_ids = [1, 2, 3, 4] futures = user_ids.map do |id| future = session.execute_async(select_user, id) future.then do |users| user = users.first future = session.execute_async(select_page, user[‘username']) future.then do |pages| page = pages.first User.new(user, Page.new(page)) end end end Cassandra::Future.all(futures).get
= session.prepare("SELECT * FROM users WHERE id = ?") select_page = session.prepare("SELECT * FROM pages WHERE slug = ?") user_ids = [1, 2, 3, 4] futures = user_ids.map do |id| future = session.execute_async(select_user, id) future.then do |users| user = users.first future = session.execute_async(select_page, user[‘username']) future.then do |pages| page = pages.first User.new(user, Page.new(page)) end end end Cassandra::Future.all(futures).get
Balancing 21 Node Node Node Client Node Node Node Client Client Client Client Client Local nodes are queried first, if non are available, the request could be sent to a remote node.
Nodes that own a Replica of the PK being read or written by the query will be contacted first. Node Node Replica Node Client Replica Replica Partition Key will be inferred from Prepared Statements metadata
of Server Errors 26 Application Thread Node Pool Session Pool Pool Pool Application Thread Application Thread Client Cluster Node Node Node Load Balancing Policy
of Server Errors 26 Application Thread Node Pool Session Pool Pool Pool Application Thread Application Thread Client Cluster Node Node Node Load Balancing Policy
of Server Errors 26 Application Thread Node Pool Session Pool Pool Pool Application Thread Application Thread Client Cluster Node Node Node Load Balancing Policy
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