Online data transformation

A method for data transformation, implemented using at least one hardware processor, the method comprising:

• operating a plurality of rekey threads and a plurality of block-access threads by the at least one hardware processor;
• each rekey thread performing a first lock on a block of a set of blocks, rekeying the first set of locked blocks, and unlocking the first set of locked blocks, and writing metadata regarding at least one key and rekeying status of the first set of locked blocks;
• and
• each block-access thread performing a second lock on a further block of the set of blocks, accessing the second-locked further block, and unlocking the second-locked further block.

A data transformation system, comprising:

• a processor;
• and
• a data transformation module, implemented using a least one hardware processor, configured to:
• execute a plurality of rekey threads and a plurality of file or block access threads;
• perform a first lock on a first block or a first portion of a file, for a first rekey thread;
• rekey the first-locked first block or first portion of the file, for the first rekey thread;
• perform a second lock on a second block or a second portion of the file, for a first file or block access thread;
• and
• access the second-locked second block or second portion of the file, for the first file or block access thread.