System and method for enhancing availability of a distributed object storage system during a partial database outage

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United States of America Patent

PATENT NO 9904605
SERIAL NO

14930751

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Abstract

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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.

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Patent Owner(s)

  • HITACHI DATA SYSTEMS CORPORATION

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Bryant, Alan G Walpole, US 10 124
Grimaldi, Kevin S Roslindale, US 5 83
Palmer, Trek Cambridge, US 7 109
Pinkney, David B Andover, US 8 155

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