[HDFS-8619] Erasure Coding: revisit replica counting for striped blocks

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Hadoop Flags: Reviewed
• Assignee: Jing Zhao
• Reporter: Jing Zhao
• Created: 18/Jun/15 00:22
• Updated: 30/Sep/15 19:38
• Resolved: 15/Jul/15 14:44

Description

Currently we use the same BlockManager#countNodes method for striped blocks, which simply treat each internal block as a replica. However, for a striped block, we may have more complicated scenario, e.g., we have multiple replicas of the first internal block while we miss some other internal blocks. Using the current countNodes methods can lead to wrong decision in these scenarios.