Methods, electronic devices and computer program product for replicating metadata

A device, comprising:

• at least one processing unit;
• and
• at least one memory, which is coupled to the at least one processing unit and stores machine executable instructions, which, when executed by the at least one processing unit, cause the device to perform operations, comprising:
• in response to receiving a request for replication of metadata to a target node, obtaining information of an index structure associated with the metadata, the index structure comprising terminal nodes that store the metadata and index nodes that store index information of the terminal nodes, wherein the obtaining the information of the index structure comprises:
• obtaining page information related to leaf pages and index pages included in a B+ Tree, the leaf pages store the metadata and the index pages store leaf page index information of the leaf pages;
• and
• replicating, to the target node, a group of items of the metadata in the sequence to be replicated, wherein the replicating the group of items of the metadata to the target node comprises:
• determining as upper limit on length of metadata that the target node permits to be replicated for any replication;
• determining based on and without exceeding the upper limit on length, a number of the group of items that are able to be replicated from the metadata;
• and
• replicating the number of the group of items from the metadata to the target node.

A non-transitory computer readable medium comprising executable instructions that, when executed by a processor, facilitate performance of operations, comprising:

• in response to receiving a request to replicate metadata to a target node, obtaining information of an index structure associated with the metadata, the index structure comprising terminal nodes usable for storing the metadata and index nodes usable for storing index information of the terminal nodes, wherein the obtaining the information of the index structure comprises:
• obtaining information related to leaf pages and index pages included in a B+ Tree, the leaf pages usable for storing the metadata and the index pages being usable for storing index information of the leaf pages;
• and
• replicating, to the target node, items of the metadata in the sequence to be replicated, wherein the replicating the items of the metadata to the target node comprises:
• determining a constraint on length of metadata that the target node permits to be replicated;
• determining, based on the constraint on length, a number of the items that are able to be replicated from the metadata;
• and
• replicating the number of items from the metadata to the target node.