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AssigneeHitachi Data Systems Corporation
InventorsAlan G. Bryant, Kevin S. Grimaldi, Trek Palmer, David B. Pinkney
Estimating the term…
An “operate with missing region” feature allows a cluster to continue servicing reads for available regions even when some regions are missing. Upon a given node failure condition, the cluster is placed in an effective read-only mode for all regions. The node failure condition typically is one where there has been a failure of an authoritative region copy and no backup copy is then available. Typically, “read-only” means no client write or update requests succeed while the cluster is in this state. Those requests should fail with an error message that indicates failure because of the read-only status. Preferably, such requests are re-tried. In this mode, regions are only allowed to perform read operations but the cluster continues to operate with missing regions, and missing regions are entered on a region map. The cluster then automatically recovers returning missing regions, after which it leaves the read-only state.
A method for a computer system having a plurality of nodes, wherein metadata objects are stored in a set of regions distributed across the plurality of nodes, the method comprising:
A computer system, comprising:
A non-transitory computer-readable medium having stored thereon instructions that, when executed by a processor, perform a method operative in a plurality of nodes in which metadata objects are stored in a set of regions distributed across the plurality of nodes, the method comprising:
The non-transitory computer-readable medium as described in claim, wherein the method further comprises:
Dependencies are inferred from the claim text.