Emc IP Holding Company LLC

David Leimbach

Douglas Kilpatrick

Mark Ranger

Ronald Steinke

Raymond Ramsden

Michael Frank

Gerald T Carter

Shikhar Mall

Methods, systems and computer program products for maintaining components of networked nodes with distributed data dependencies are described. For example, in accordance with one or more embodiments, a method can comprise identifying, by a device comprising a processor, in a group of dependent nodes of a cluster of nodes, a first portion of the dependent nodes for which an update is implicated. The method can further comprise selecting, by the device, from the first portion, a second portion of the dependent nodes that are predicted to be able to be updated with the update without affecting access to data of the group of dependent nodes. Further, the method can comprise communicating, by the device, the update to the second portion of the dependent nodes.

Maintaining components of networked nodes with distributed data dependencies

Facilitating antivirus scan filing locking based on cluster lock mechanism in distributed file systems is provided herein. A system comprises a processor and a memory that stores executable instructions that, when executed by the processor, facilitate performance of operations. The operations comprise determining an antivirus scan status of an object, based on an open object request received from a node device of a cluster of node devices, which is determined through the use of Lock Value Blocks. The antivirus scanning of the object is a precondition for opening the object. The antivirus scan status of the object is one of an unscanned status, a queued status, or a scanned status. Further, the operations can comprise, based on the antivirus scan status being the queued status or the scanned status, selectively facilitating the opening of the object at the node device while circumventing the precondition.

Facilitating antivirus scan filing locking based on cluster lock mechanism in distributed file systems

Sharing a state between network computing devices is described. For instance, a first state update can be received from a second computing device via a network connection. Further, in a shared state file stored in a storage device coupled to the first computing device, a first portion of the shared state file is identified that is allocated to the second computing device. Further, based on the first state update, the first portion of the shared state file can be updated.

Maintaining a shared state among networked computing devices using a shared data store

Facilitating the implementation of cluster counters on lock value blocks in distributed file systems is provided herein. A system comprises a processor and a memory that stores executable instructions that, when executed by the processor, facilitate performance of operations. The operations comprise receiving, from a first node device of a group of node devices, first information indicative of a first lock value block status of an object, and, from a second node device of the group of node devices, second information indicative of a second lock value block status of the object. The operations also can comprise merging the first information and the second information, resulting in a status of a lock value block of the object implemented at respective node devices of the group of node devices.

Facilitating the implementation of cluster counters on lock value blocks in distributed file systems

Implementations are provided herein for non-disruptive upgrade including rollback capabilities for a distributed file system within a cluster of nodes. To continue availability of the file system to external clients during the upgrade process, nodes can be upgraded piecemeal, for example, in one implementation, one node at a time. When a node is undergoing certain stages of the upgrade process, external clients can be directed toward the remaining nodes of the file system that are not currently being upgraded, including already upgraded nodes, to perform client activity. During the upgrade process, a first subset of nodes can be running in an upgraded state while a second subset of nodes can be in a non-upgraded state, both providing access to external clients in a seamless manner. In one implementation, a second namespace can be established at the onset of the upgrade process that reflects the new version of the operating system. The second namespace can be maintained in parallel with the original namespace during the pendency of the upgrade and/or downgrade process. A configuration translation layer can also be established on each node of the cluster of nodes. The configuration translation layer can provide the necessary key value pair translations that allow a request made an old version node to be performed by a new version node and vice versa. At the conclusion of an upgrade or a rollback, the cluster can enter a committed state and the namespace data that is no longer needed can be expired.

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Lynnwood, WA, United States of America

David Leimbach