公开(公告)号：US09712609B2

公开(公告)日：2017-07-18

申请号：US14420127

申请日：2013-07-02

Applicant: NEC Corporation ,  Masafumi Yano

Inventor： Masatsugu Ogawa ,  Takashi Torii ,  Masaki Kan ,  Dai Kobayashi ,  Masafumi Yano

IPC: G06F15/16 ,  H04L29/08 ,  G06F9/50 ,  G06F11/34

CPC classification number: H04L67/1008 ,  G06F9/5088 ,  G06F11/3433

Abstract: An evaluation value DS for evaluating responsiveness of a first node when no loads are being transferred, an evaluation value Dn for evaluating responsiveness of a path P connecting between the first and second nodes assuming that loads are being transferred, and an evaluation value Dr for evaluating responsiveness of the second node N2 assuming that the second node has received a load from the first node are calculated. Whether or not to transfer the load is determined depending upon comparison results of magnitude of DS and a sum of Dr+Dn.

公开(公告)号：US20150106468A1

公开(公告)日：2015-04-16

申请号：US14397607

申请日：2013-05-16

Applicant: NEC Corporation

Inventor： Dai Kobayashi ,  Masaki Kan

IPC: H04L12/24 ,  H04L29/08 ,  G06F12/08

CPC classification number: H04L41/082 ,  G06F3/061 ,  G06F3/0635 ,  G06F3/067 ,  G06F12/0813 ,  G06F12/0815 ,  G06F12/0868 ,  G06F2212/1016 ,  G06F2212/466 ,  G06F2212/622 ,  H04L67/1097 ,  H04L67/2857

Abstract: A distributed storage system which achieves high access performance simultaneously with maintaining the flexibility of allocation of data objects is disclosed. A client terminal includes an asynchronous cache that retains an correspondence relationship between an identifier of object data and an identifier of the storage node that is to handle an access request for the object data, and an access unit that determines the storage node that is to handle the access request on the basis of the correspondence relationship stored in the asynchronous cache, and that transmits the access request to the determined storage node, wherein the storage node includes a determination unit that determines, upon receiving the access request from the client terminal, whether the access request is to be handled by itself, and notifies the client terminal of the determined result, and an update unit that updates the storage node that is to handle the access request, and wherein the asynchronous cache changes the correspondence relationship in accordance with the update, the change being made asynchronous with the update by the storage nodes.

Abstract translation: 公开了一种在保持数据对象分配的灵活性的同时实现高访问性能的分布式存储系统。 客户终端包括保持对象数据的标识符和要处理对象数据的访问请求的存储节点的标识符之间的对应关系的异步高速缓存，以及确定要处理的存储节点的访问单元 所述访问请求基于存储在所述异步高速缓存中的对应关系，并且将所述访问请求发送到所确定的存储节点，其中，所述存储节点包括确定单元，其在从所述客户终端接收到所述访问请求时，确定是否 访问请求本身将被处理，并且向客户终端通知所确定的结果，更新单元更新处理访问请求的存储节点，并且其中异步缓存根据 更新，更改由存储节点的更新异步。

公开(公告)号：US10287756B2

公开(公告)日：2019-05-14

申请号：US15519896

申请日：2015-10-20

Applicant: NEC Corporation

Inventor： Dai Kobayashi ,  Takahiro Kumura ,  Masatake Takahashi

IPC: E03B1/02 ,  E03B7/00 ,  E03B7/07

Abstract: In order to keep the deterioration of water distribution pipes from progressing, a tap water management system is provided with: a water pressure detection unit for detecting the water pressure in at least one location in a water distribution pipe for carrying clean water from a water distribution site to a consumer. and transmitting the detection result as water pressure information; a deterioration detection unit for detecting deterioration in at least one location in a water distribution pipe, and transmitting the detection result as deterioration information; a water distribution planning unit for causing a water distribution plan that is a plan for water distribution pressure to be determined on the basis of information regarding past water demand; a deterioration-reducing water distribution planning unit for deciding, on the basis of the water distribution plan, the water pressure information, and the deterioration information. a deterioration-reducing water distribution plan according to the extent of deterioration; a water distribution pressure changing unit for changing the water distribution pressure of the water distribution pipe; and a water distribution pressure control unit for controlling the water distribution pressure changing unit on the basis of the deterioration-reducing water distribution plan.

公开(公告)号：US09870402B2

公开(公告)日：2018-01-16

申请号：US14427182

申请日：2013-09-27

Applicant: NEC CORPORATION

Inventor： Dai Kobayashi ,  Satoshi Yamakawa

IPC: G06F7/00 ,  G06F17/30

CPC classification number: G06F17/30516 ,  G06F17/30321 ,  G06F17/30528 ,  G06F17/30554 ,  G06F17/30575 ,  G06F17/30867

Abstract: A distributed storage device according to the present invention includes: a plurality of storage nodes, the plurality of storage nodes includes: a data storage unit that accumulates stream data output from a device; a first time frame generation unit that generates a time frame synchronized with another storage node and associates a data element included in stream data accumulated in the data storage unit with one of time frames; a data selection unit that selects a data element associated with a predetermined time frame from the stream data accumulated in the data storage unit, based on an access request from a client terminal; and a data transmission unit that transmits a data element selected by the data selection unit to the client terminal.

公开(公告)号：US20150058293A1

公开(公告)日：2015-02-26

申请号：US14386946

申请日：2013-03-21

Applicant: NEC CORPORATION

Inventor： Dai Kobayashi ,  Junpei Kamimura ,  Masaki Kan ,  Masumi Ichien ,  Yoshiaki Sakae

IPC: G06F17/30

CPC classification number: G06F16/1734 ,  G06F3/0607 ,  G06F3/061 ,  G06F3/0632 ,  G06F3/067 ,  G06F16/182 ,  G06F16/23

Abstract: A distributed storage system, includes: a first data storage unit that holds data in a first data structure; a second data storage unit that holds the data in a second data structure different from the first data structure; an update information holding unit that holds an update information item(s) indicating update content of the data, and if a predetermined update condition is satisfied, applies the update information item(s) to the second data storage unit and reflects the update content in the second data storage unit; an update state monitoring unit that monitors the update information item(s) held by the update information holding unit and extracts as an update state an application status of the update information item(s) to the second data storage unit; and an update condition change unit that changes the predetermined update condition based on a change command for changing the predetermined update condition, the change command being determined in accordance with the update state.

Abstract translation: 分布式存储系统包括：第一数据存储单元，其以第一数据结构保存数据; 第二数据存储单元，其将数据保存在与第一数据结构不同的第二数据结构中; 更新信息保持单元，其保存指示数据的更新内容的更新信息项，并且如果满足预定的更新条件，则将更新信息项应用于第二数据存储单元，并将更新内容反映到 第二数据存储单元; 更新状态监视单元，监视由所述更新信息保持单元保持的所述更新信息项，并将所述更新信息项的应用状态作为更新状态提取给所述第二数据存储单元; 以及更新条件改变单元，其基于用于改变所述预定更新条件的改变命令来改变所述预定更新条件，所述改变命令根据所述更新状态来确定。