File access method, control node, client and electronic device

Abstract

The embodiments of the present application disclose a file access method, a control node, a client and an electronic device. The method includes: judging whether the communication link between the control node and the first client is disconnected; when determining the communication link at the first moment When disconnected, a notification message is sent to the target data block server at the second moment; wherein, the second moment is later than the first moment, and the time interval between the second moment and the first moment is the first preset duration, and the target data The block server is used to provide the first client with read and write access services to the target file before the first client's read and write access rights to the target file expire, and the notification message is used to notify the target data block server that the first client has access to the target file. 's read and write access has expired.

Description

technical field [0001] The present application relates to the technical field of computer network, and more specifically relates to a file access method, a control node, a client and an electronic device in a distributed system. Background technique [0002] A distributed system usually includes a client (Client), a control (Master) node, and a block server (ChunkSever). Users access data through the Client, and the Master node stores the user's metadata, that is, the file name, file length, and the actual storage location of the data, etc. Information, ChunkSever actually stores user data. When users read and write data, they first visit the Master node to query which Chunksever the actual data is stored on, and then access the corresponding Chunksever to read and write data. [0003] When the Client accesses the file, it uses the session (Session) mechanism to regularly maintain heartbeat with the Master node to obtain the file access right. The Master node detects whethe...

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Problems solved by technology

But when the network between the Client and the ChunkSever remains connected, and the network between the Master node and the ChunkSever also remains connected, the Master will withdraw the file access right and release the Client's Session information due to the disconnection of the heartbeat, and then the Master notifies the ChunkSever of the Client No longer has the right to access the file, so that the Client will not be able to access the ChunkSever, causing the Client to fail to write

[0004] At present, in order to improve the availability of the system when a network partition occurs in a distributed system, the tasks running on the Client that has no network connection with the Master node are scheduled to be executed on other Clients. However, due to the existence of network partitions, the new Client and the network The networks between are not necessarily the same, which may cause problems with multiple scheduling

And even if the new Client is connected to the Master node, the new Client can successfully reopen the file, but the migration of the task and the reopening of the file take seconds, and smooth fault tolerance and migration cannot be achieved.

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