What is the role of GFS master during read and write operations?

In summary, the GFS Master has a limited role in read and write operations, primarily focused on maintaining the overall system and ensuring data replication.
  • #1
shivajikobardan
674
54
I am really confused by this question as there are multiple possible answers of this question, so I am asking this.
There is very minimum role of GFS master in writing and reading operations..
You can either go through these or just tell me what is the correct answer if you are bored to go through all of these.

https://static.googleusercontent.com/media/research.google.com/en//archive/gfs-sosp2003.pdf
1) My try-: https://we.tl/t-DG1QxAFMFJ

2) https://www.uio.no/studier/emner/matnat/ifi/INF5100/h10/undervisningsmateriale/gfs.pdf



3) https://ameyashanbhag.gitbooks.io/p...lytics/content/hadoop/google-file-system.html

read and write operations on GFS

4)https://courses.cs.washington.edu/courses/cse550/14au/notes/lect13.pdf



5)

6)


http://wwwusers.di.uniroma1.it/~ste...s_18-19/Schedule_files/Google File System.pdf
7) https://cs.stanford.edu/~matei/courses/2015/6.S897/slides/gfs.pdf slide 17

8)https://imgur.com/a/eZKHCRd
https://wiki.ubc.ca/images/8/81/GFS.pdf
9)https://imgur.com/a/GM3ZUpX10) https://imgur.com/a/BOOGoSa
 
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  • #2
The correct answer is that the GFS Master plays a minimal role in read and write operations. It is only responsible for maintaining the namespace, managing the leasing of chunks, and orchestrating the replication of data. The GFS Master does not participate in any of the actual read or write operations.
 

1. What is the GFS master and why is it important during read and write operations?

The GFS master is the central control node in a Google File System (GFS) cluster. It is responsible for managing the metadata of the entire file system, including file locations, access permissions, and replicas. During read and write operations, the GFS master coordinates communication between clients and chunkservers to ensure data consistency and availability.

2. How does the GFS master handle data replication in a cluster?

The GFS master is responsible for creating and maintaining replicas of data blocks in a GFS cluster. It uses a replication factor, typically set to three, to determine the number of copies of a data block that should be stored in the cluster. The GFS master also monitors the health of chunkservers and can initiate the creation of new replicas if a chunkserver fails or becomes unavailable.

3. Can the GFS master perform read and write operations?

No, the GFS master does not directly handle read and write operations. Instead, it coordinates these operations by communicating with clients and chunkservers. The GFS master is primarily responsible for managing file metadata and ensuring data consistency and availability, while read and write operations are handled by the client and chunkservers directly.

4. How does the GFS master handle multiple clients accessing the same file simultaneously?

The GFS master uses a distributed locking mechanism to manage concurrent access to files. When a client requests to read or write a file, the GFS master grants a lease to that client, preventing other clients from modifying the file until the lease expires. This ensures that only one client has write access to a file at a time, while allowing multiple clients to read the same file simultaneously.

5. What happens if the GFS master fails or becomes unavailable?

If the GFS master fails, the entire file system can become inaccessible. To prevent this, the GFS master in a production environment is usually replicated itself, with a standby master ready to take over in case the primary master fails. Additionally, the GFS master periodically checkpoints its state to disk, allowing it to recover quickly in case of failure.

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