公开(公告)号：US10474643B2

公开(公告)日：2019-11-12

申请号：US15145311

申请日：2016-05-03

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Myung Hoon Cha ,  Young Kyun Kim ,  Hong Yeon Kim ,  Wan Choi

IPC: G06F16/182 ,  G06F16/16

Abstract: A distributed file system includes metadata servers and data servers. The metadata server includes a selecting unit to select a data server from the data servers, a chunk allocation requesting unit to request that the selected data server perform chunk allocation, a chunk list managing unit to insert a list of chunks transmitted from the data server into a chunk list pool and determine an arrangement method of the chunk list pool, and a chunk fetching unit to fetch available chunk information from the chunk list pool. The data server includes a receiving unit to receive request for chunk allocation from the metadata server, a chunk allocating unit to allocate chunks in response to the request for chunk allocation and write a list of chunks based on information about the allocated chunk, and a transmitting unit to transmit the list of chunks to the metadata server.

公开(公告)号：US10810165B2

公开(公告)日：2020-10-20

申请号：US15586083

申请日：2017-05-03

Applicant: Electronics and Telecommunications Research Institute

Inventor： Myung Hoon Cha ,  Sang-Min Lee ,  Young Kyun Kim ,  Hong Yeon Kim

IPC: G06F16/00 ,  G06F16/176 ,  G06F16/13 ,  G06F16/27 ,  G06F16/16 ,  G06F16/18

Abstract: A distributed storage server includes a plurality of data server devices and a plurality of metadata server devices. The metadata server devices store metadata associated with data which is distributively stored in the data server devices. A selected metadata server device checks whether a dangling directory occurs by performing a rename operation, based on information associated with a full path of a parent directory of a source and a full path of a parent directory of a target included in a request of the rename operation. When it is determined that the dangling directory does not occur, the selected metadata server device processes transactions directed to the metadata such that the rename operation is performed. The checking whether the dangling directory occurs is performed before a transaction period for processing the transactions.