Shulou(Shulou.com)06/02 Report--

This article mainly introduces "the distributed locking function of GlusterFS". In the daily operation, I believe that many people have doubts about the distributed locking function of GlusterFS. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the doubts about "the distributed locking function of GlusterFS". Next, please follow the editor to study!

I. File system lock

From the point of view of the code, the GlusterFS lock is implemented by xlators/locks, which is a Translator, which is generally loaded directly on the posix file system on the server side, that is, it directly locks the files on the local file system on the server side (record lock). Of course, the locking mechanism implemented by xlator/locks will eventually reflect the lock on the local file system on the Server side. Its main principle is: as different clients write to the overlapping area of the same file, the write request is inserted into a waiting queue and dispatched by flush operation; otherwise, it can read and write in parallel.

II. Transaction lock

Logically, different cluster modes have different processing flows, and there will be different processing logic to ensure the transactionality of the lock. The processing flow of read operation is relatively simple, and the following is the main analysis and writing process.

For AFR, because files are written to multiple storage nodes at the same time, in order to ensure data consistency, the locks of each storage node must be obtained before the write operation can be performed. This involves multiple lock management nodes, and as long as one node fails to lock successfully, you must discard the locks previously acquired from the remaining nodes and retry to acquire locks for all nodes.

For DHT, since file writing only corresponds to one storage node, once the node is located successfully, the write operation is relatively simple.

For Stripe, first of all, through calculation, locate the corresponding storage node of a file slice, and then obtain the lock of the corresponding node. Because each slice involves only one storage node, similar to DHT, the processing of write operation is relatively simple.

At this point, the study on "the distributed locking function of GlusterFS" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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