Dear all, As titled, I actually have two questions here:
1. In current releases like hadoop-2.2.0, is block id unique and able to locate a Block in HDFS? I'm asking because I could see HDFS-4645 is trying to resolve the uniqueness issue. However, from the code comment it seems block id is expected to be unique 2. It seems there's no method to get a Block object through a block id. However, there's some scenarios need such method, like if I use the FavouredNode feature to create logical datanode group and planned to put some data within a group, then I might need to periodically check whether there's block somehow placed outside the group, and move it back. In such scenario, I would need to first get block ids, then move. But to move them, it seems we need a Block instance to initiate the ExtendedBlock object. Any suggestion, or reference to existing JIRA would be highly appreciated, and thanks in advance! -- Best Regards, Li Yu
