The open-source client does not emulate operations like directory renames that would require many S3 API calls or POSIX file system features that are not supported in S3 APIs. Mountpoint allows you to map S3 buckets or prefixes into your instance’s file system namespace, traverse the contents of your buckets as if they were local files, and achieve high throughput access to objects. Mountpoint is designed for large-scale analytics applications that read and generate large amounts of S3 data in parallel but don’t require the ability to write to the middle of existing objects. James Bornholt, scholar at AWS and assistant professor at the University of Texas, Devabrat Kumar, senior product manager at AWS, and Andy Warfield, distinguished engineer at AWS, acknowledge that the client is not a general-purpose networked file system, and comes with some restrictions on file operations and write: The alpha release does not support writes (PUTs) and the client is expected to only support sequential writes to new objects in the future. The client supports random and sequential read operations on files and the listing of files and directories. Mountpoint for Amazon S3 translates local file system API calls to S3 object API calls like GET and LIST. Currently in alpha, the local mount point provides high single-instance transfer rates and is primarily intended for data lake applications. During the latest Pi Day, AWS announced Mountpoint for Amazon S3, an open-source file client to deliver high throughput access on Amazon S3.
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