[HDFS-5475] NN incorrectly tracks more than one replica per DN

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Heterogeneous Storage (HDFS-2832)
• Fix Version/s: Heterogeneous Storage (HDFS-2832)
• Component/s: namenode
• Hadoop Flags: Reviewed
• Assignee: Arpit Agarwal
• Reporter: Arpit Agarwal
• Created: 07/Nov/13 19:34
• Updated: 08/Nov/13 01:02
• Resolved: 08/Nov/13 01:02

Description

NN chooses a provisional target storage when allocating a new block and records that block in the blockList of that storage. However the datanode is free to choose a different storage for the block. On the next block report the NN ends up with two blockList entries for the same replica+DN combination.