[HDFS-6961] Archival Storage: BlockPlacementPolicy#chooseTarget should check each valid storage type in each choosing round

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Component/s: balancer & mover, namenode
• Hadoop Flags: Reviewed
• Assignee: Jing Zhao
• Reporter: Jing Zhao
• Created: 28/Aug/14 05:27
• Updated: 19/Sep/14 13:52
• Resolved: 04/Sep/14 21:23

Description

Currently in each choosing round of BlockPlacementPolicy#chooseTarget (e.g., round 1 for choosing local storage, round 2 for remote rack, etc.), we only take into account the first storage type in the storage type list. This may
fail to choose the local machine or sometimes may even fail to choose enough nodes.