Apparatus and method for accessing a metadata
First Claim
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1. An apparatus for accessing a metadata, comprising:
- a deletion file list unit that stores information about a deleted metadata during a predetermined period following the metadata'"'"'s deletion; and
a metadata server selector that selects a metadata server from a plurality of metadata servers comprising a master metadata server and a plurality of slave metadata servers to receive an operation request that includes a metadata check request about a metadata, wherein the selected metadata server is selected based on the information from the deletion file list unit, wherein the metadata server selector selects the metadata server to receive the operation request according to whether or not the relevant metadata to be checked is deleted when requesting the metadata check, and wherein the metadata server selector selects the master metadata server and transmits the metadata check request when the relevant metadata is deleted.
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Abstract
Provided are an apparatus and a method for acquiring a consistent result even if one client accesses any metadata server in a circumstance that the cluster configuring many metadata servers exist. The apparatus as mentioned above includes a deletion file list unit that stores information about a deleted metadata during a predetermined period; and a metadata server selector that selects a metadata server to receive a operation request about a metadata among a plurality of metadata servers based on information from the deletion file list unit.
9 Citations
8 Claims
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1. An apparatus for accessing a metadata, comprising:
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a deletion file list unit that stores information about a deleted metadata during a predetermined period following the metadata'"'"'s deletion; and a metadata server selector that selects a metadata server from a plurality of metadata servers comprising a master metadata server and a plurality of slave metadata servers to receive an operation request that includes a metadata check request about a metadata, wherein the selected metadata server is selected based on the information from the deletion file list unit, wherein the metadata server selector selects the metadata server to receive the operation request according to whether or not the relevant metadata to be checked is deleted when requesting the metadata check, and wherein the metadata server selector selects the master metadata server and transmits the metadata check request when the relevant metadata is deleted. - View Dependent Claims (2, 3, 4)
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5. A method for accessing a metadata, comprising:
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storing information about a deleted metadata in reference to a deletion file list unit during a predetermined period following the metadata'"'"'s deletion; and selecting a metadata server from a plurality of metadata servers comprising a master metadata server and a plurality of slave metadata servers to receive an operation request that includes a metadata check request about a metadata, wherein the selected metadata server is selected based on the information from the deletion file list unit, wherein the selecting the metadata server selects the metadata server to receive the operation request according to whether or not the relevant metadata to be checked is deleted when requesting the metadata check, and wherein the selecting the metadata server selects the master metadata server and transmits the metadata check request when the relevant metadata is deleted. - View Dependent Claims (6, 7, 8)
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Specification