Regarding the multi-NameNode concurrency characteristics of Huawei’s distributed storage products, which of the following statements are correct? (Multiple choice)

Regarding the multi-NameNode concurrency characteristics of Huawei’s distributed storage products, which of the following statements are correct? (Multiple choice)
A . The number of files supported by multiple Active NameNodes is no longer restricted by the memory of a single node
B . Multi-directory metadata operations, multi-node full concurrency
C . Avoid metadata service interruption caused by traditional HDFS NameNode switching
D . Multiple Active NameNodes provide metadata services, and the data among multiple nodes is consistent in real time

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Answer: ABCD