Wandisco Inc.

Ca, Inc.

Airmagnet, Inc.

Cirata, Inc.

Jagane Sundar

Yeturu Aahlad

Konstantin V Shvachko

Michael Parkin

Michal Dobisek

Plamen Jeliazkov

Mark McKeown

Sanjay R Radia

Chia-Chee Kuan

Miles Wu

David A Henseler

Kostantin V Shvachko

Micahel Parkin

Plamen Jeliazkov Jeliazkov

Mark Mckeown

A cluster of nodes implements a single distributed file system comprises at least first and second data centers and a coordination engine process. The first data center may comprise first DataNodes configured to store data blocks of client files, and first NameNodes configured to update a state of a namespace of the cluster. The second data center, geographically remote from and coupled to the first data center by a wide area network, may comprise second DataNodes configured to store data blocks of client files, and second NameNodes configured to update the state of the namespace. The first and second NameNodes are configured to update the state of the namespace responsive to data blocks being written to the DataNodes. The coordination engine process spans the first and second NameNodes and coordinates updates to the namespace stored such that the state thereof is maintained consistent across the first and second data centers.

Geographically-distributed file system using coordinated namespace replication over a wide area network

A computer-implemented method may comprise providing a first executed agreement cache in a first data center and a second executed agreement cache in a second data center; receiving agreements on proposals to create or make changes to files stored in the first and second data centers; storing metadata of the files referred to by the received agreements the first and/or second executed agreement caches; maintaining the first and second executed agreement caches synchronous with one another before the files referred to by the received agreements are created or changed; creating or making changes to the file referred to by the received agreements only after the first and second executed agreement caches have been synchronized; and searching the first and/or second executed agreement caches for updated metadata whenever requests for data of files stored in the first or second data centers are received in the first or the second data centers and, responsive to the received requests, providing data corresponding to the updated metadata when updated metadata is found.

Methods, devices and systems for maintaining consistency of metadata and data across data centers

A cluster of nodes in a distributed file system may include; at least two namenodes, each coupled to a plurality of data nodes and each configured to store a state of a namespace of the cluster and each being configured to respond to a request from a client while other(s) of the namenodes are responding to other requests from other clients; and a coordination engine coupled to each of the namenodes. The coordination engine may be configured to receive proposals from the namenodes to change the state of the namespace by replicating, deleting and/or adding data blocks stored in the data nodes and to generate, in response, an ordered set of agreements that specifies an order in which the namenodes are to change the state of the namespace. The namenodes are configured to delay making changes thereto until after the ordered set of agreements is received from the coordination engine.

Distributed file system using consensus nodes

One or more control nodes provide for the efficient and automated allocation and management of computing functions and resources within the distributed computing system. The distributed computing system includes a software image repository storing: (i) one or more image instances of a virtual machine manager that is executable on the application nodes, wherein when executed on the applications nodes, the image instances of the virtual machine manager provide one or more virtual machines, and (ii) one or more image instances of one or more software applications that are executable on the virtual machines. The distributed computing system also includes a control node that comprises an automation infrastructure to provide autonomic deployment of the image instances of the virtual machine manager on the application nodes and to provide autonomic deployment of the image instances of the software applications on the virtual machines.

Distributed computing system having autonomic deployment of virtual machine disk images

An access point in a wireless network is traced by sending an internet protocol (IP) packet from a detector to the access point through the wireless network. The detector and the access point are connected through a private wired network. The IP packet is sent with the source IP address field and the destination IP address of the IP packet set to the wireless IP address and wired IP address, respectively, of the detector. The IP packet is routed back to the detector through a switch in the private wired network. When the IP packet is received at the detector, a source IP address, which corresponds to the port on the switch used to send the IP packet, is determined from the received IP packet.

Tracing an access point in a wireless network

Growing community of inventors

Saratoga, CA, United States of America

Jagane Sundar