Servicing file restorations in a deduplication filesystem using a global read-ahead pool

A system comprising:

• a processor;
• and memory configured to store one or more sequences of instructions which, when executed by the processor, cause the processor to carry out the steps of:
• provisioning access object (AOB) and deduplication object (DOB) services of a deduplication filesystem across a cluster of nodes;
• receiving, at a client-side library, a request to restore a file;
• grouping read-ahead buffers at the AOB services to form a global read-ahead pool;
• prefetching read-ahead IO objects corresponding to offset ranges in the file to populate the global read-ahead pool, the read-ahead IO objects being read by the DOB services from a storage layer of the deduplication filesystem;
• creating a key-value store to track the read-ahead IO objects, the key-value store comprising a key and a value, the key being based on a file handle of the file, offset within the file, and a size of a buffer to read, and the value identifying a location of the buffer at an AOB service;
• and
• servicing the request using the global read-ahead pool.

A computer program product, comprising a non-transitory computer-readable medium having a computer-readable program code embodied therein, the computer-readable program code adapted to be executed by one or more processors to implement a method comprising:

• provisioning access object (AOB) and deduplication object (DOB) services of a deduplication filesystem across a cluster of nodes;
• receiving, at a client-side library, a request to restore a file;
• grouping read-ahead buffers at the AOB services to form a global read-ahead pool;
• prefetching read-ahead IO objects corresponding to offset ranges in the file to populate the global read-ahead pool, the read-ahead IO objects being read by the DOB services from a storage layer of the deduplication filesystem;
• creating a key-value store to track the read-ahead IO objects, the key-value store comprising a key and a value, the key being based on a file handle of the file, offset within the file, and a size of a buffer to read, and the value identifying a location of the buffer at an AOB service;
• and
• servicing the request using the global read-ahead pool.