Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, are described for storing message data in a PubSub system. In certain examples, the method includes storing messages of each of a plurality of channels in a writable portion of a respective buffer for the channel. The method may also include moving a pointer delineating a boundary between the writable portion and a readable portion of the buffer such that the messages are in the readable portion after the pointer has moved. The method may also include allowing one or more subscribers to read from the readable portion of one or more of the buffers during the storing.

Abstract: A plurality of channels are maintained, wherein each channel comprises a plurality of messages stored in one or more buffers, wherein a first node stores a first copy of a first buffer for a first channel of the plurality of channels, wherein each of a plurality of secondary nodes stores a respective second copy of the first buffer, and wherein at least one subscriber is subscribed to messages of the first channel. A failure of the first node is detected. One of the plurality of secondary nodes are identified as a second node to access a second copy of the first buffer. The at least one subscriber is redirected from the first node to the second node and messages stored in the second copy on the second node are retrieved for the at least one subscriber.

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for maintaining a plurality of channels, each channel comprising an ordered plurality of messages stored in one or more buffers, each buffer having a respective time-to-live and a plurality of copies residing on respective nodes, detecting failure of a first node of the plurality of nodes wherein the first node stores respective first copies of first buffers and at least one subscriber is subscribed to messages of one or more first channels, for a first buffer with a first copy residing on the first node, identifying any other of the plurality of nodes as a second node storing a second copy of the first buffer, redirecting the at least one subscriber from the first node to the second node, and retrieving messages stored in the second copy on the second node for the at least one subscriber.

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, are described for storing message data in a PubSub system. In certain examples, the method includes storing messages of each of a plurality of channels in a writable portion of a respective buffer for the channel. The method may also include moving a pointer delineating a boundary between the writable portion and a readable portion of the buffer such that the messages are in the readable portion after the pointer has moved. The method may also include allowing one or more subscribers to read from the readable portion of one or more of the buffers during the storing.

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, are described for storing message data in a PubSub system. In certain examples, messages are received from a plurality of publishers for a plurality of channels. The messages are stored in a writable portion of a respective buffer for the channel according to an order, wherein messages in the writable portion of the buffer are inaccessible to subscribers. The method may also include advancing a pointer demarcating a boundary between the writable portion and a readable portion of the buffer such that the message is in the readable portion after the pointer has advanced.

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, are described for storing message data in a PubSub system. In certain examples, messages are received from a plurality of publishers for a plurality of channels. The messages are stored in a writable portion of a respective buffer for the channel according to an order, wherein messages in the writable portion of the buffer are inaccessible to subscribers. The method may also include advancing a pointer demarcating a boundary between the writable portion and a readable portion of the buffer such that the message is in the readable portion after the pointer has advanced.

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for maintaining a plurality of channels, each channel comprising an ordered plurality of messages stored in one or more buffers, each buffer having a respective time-to-live and a plurality of copies residing on respective nodes, detecting failure of a first node of the plurality of nodes wherein the first node stores respective first copies of first buffers and at least one subscriber is subscribed to messages of one or more first channels, for a first buffer with a first copy residing on the first node, identifying any other of the plurality of nodes as a second node storing a second copy of the first buffer, redirecting the at least one subscriber from the first node to the second node, and retrieving messages stored in the second copy on the second node for the at least one subscriber.

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, are described for storing message data in a PubSub system. In certain examples, messages are received from a plurality of publishers for a plurality of distinct channels. The messages are ordered and stored in a plurality of buffers, with each channel having its own respective buffer. After a message has been written to a writable portion of the buffer for a channel, a pointer demarking a boundary between a readable portion of the buffer and the writeable portion of the buffer is advanced in an atomic operation. Following the atomic operation, the message resides in the readable portion and may be accessed by PubSub system components and/or processes. In general, one or more subscribers, components, or processes may read messages from the readable portion, in parallel.

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, are described for storing message data in a PubSub system. In certain examples, messages are received from a plurality of publishers for a plurality of distinct channels. The messages are ordered and stored in a plurality of buffers, with each channel having its own respective buffer. After a message has been written to a writable portion of the buffer for a channel, a pointer demarking a boundary between a readable portion of the buffer and the writeable portion of the buffer is advanced in an atomic operation. Following the atomic operation, the message resides in the readable portion and may be accessed by PubSub system components and/or processes. In general, one or more subscribers, components, or processes may read messages from the readable portion, in parallel.

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, are described for storing message data in a PubSub system. In certain examples, messages are received from a plurality of publishers for a plurality of distinct channels. The messages are ordered and stored in a plurality of buffers, with each channel having its own respective buffer. After a message has been written to a writable portion of the buffer for a channel, a pointer demarking a boundary between a readable portion of the buffer and the writeable portion of the buffer is advanced in an atomic operation. Following the atomic operation, the message resides in the readable portion and may be accessed by PubSub system components and/or processes. In general, one or more subscribers, components, or processes may read messages from the readable portion, in parallel.