Metadata tree snapshot method and apparatus, metadata tree query method and apparatus, and electronic device

A metadata tree snapshot apparatus, comprising:

• at least one processor;
• and
• a memory communicatively connected to the at least one processor;
• wherein the memory stores an instruction executable by the at least one processor, and the instruction is executed by the at least one processor to enable the at least one processor to:
• acquire a basic metadata tree and a first incremental metadata tree, wherein the basic metadata tree is created based on first snapshot data, the basic metadata tree is locked after being created, the first snapshot data is created at a previous snapshot time instant, and the first incremental metadata tree is created based on a metadata change operation after the basic metadata tree is created;
• lock the first incremental metadata tree in response to reaching a current snapshot time instant;
• create second snapshot data based on the basic metadata tree and the locked first incremental metadata tree;
• and
• after locking the first incremental metadata tree, create a second incremental metadata tree based on a metadata change operation after the current snapshot time instant and before completion of the creating the second snapshot data.