[HDFS-8005] Erasure Coding: simplify striped block recovery work computation and add tests

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: HDFS-7285
• Hadoop Flags: Reviewed
• Assignee: Jing Zhao
• Reporter: Jing Zhao
• Created: 27/Mar/15 22:24
• Updated: 30/Sep/15 19:38
• Resolved: 30/Mar/15 20:36

Description

HDFS-7369 adds the functionality to distribute recovery work of striped blocks to datanodes. There are still some pending issues:

1. In BlockManager#chooseSourceNode, a node is added into healthyIndices without checking if its block is live and healthy
2. The test TestRecoverStripedBlcoks#testMissingStripedBlock has not tested striped blocks because the file is created before setting the storage policy
3. In computeRecoveryWorkForBlocks, instead of using BlockCollection#isStriped, we'd better use BlockInfo#isStriped