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MooseFS Master Server
Port 9421 is primarily used by MooseFS, an open-source distributed file system, for communication between its master server and client nodes. It facilitates operations such as metadata queries and namespace management, enabling clients seamless access to the distributed storage resources..
MooseFS is designed to provide a scalable, fault-tolerant, networked file system, particularly suited for managing large data storage clusters across commodity hardware. The master server controls metadata and orchestrates file operations, while chunk servers handle physical data storage. Port 9421 facilitates communication between the MooseFS Master Server and its clients, allowing clients to query file system metadata such as directory structures, file locations, permissions, and space allocation.
The communication on port 9421 is generally based on a proprietary MooseFS protocol optimized for rapid metadata transactions. This metadata traffic is critical for coordinating distributed file operations and ensuring consistency across multiple clients and servers. The port typically listens on TCP for reliable, ordered delivery, essential for metadata correctness.
MooseFS supports horizontal scaling by adding or removing chunk servers without service interruption. The master server's availability on port 9421 is central because it acts as the sole authority for metadata, and client access heavily depends on this communication channel remaining available and responsive.