[HDFS-1649] Federation: Datanode command to refresh namenode list at the datanode.

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Federation Branch
• Fix Version/s: Federation Branch
• Hadoop Flags: Reviewed
• Assignee: Jitendra Nath Pandey
• Reporter: Jitendra Nath Pandey
• Created: 25/Feb/11 00:51
• Updated: 01/Mar/11 00:39
• Resolved: 01/Mar/11 00:39

Description

When a namenode is added to or removed from a cluster, we need a way to refresh the datanodes:
1. Datanode should load new configuration.
2. Compares the namenode list it has with that of new configuration. If a namenode is deleted, then corresponding
BPOfferService thread is shutdown. If a new namenode is added, a BPOfferService thread is started to service the new
namenode.