Jing Zhao created HDFS-9866:
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Summary: BlockManager#chooseExcessReplicasStriped may weaken rack
fault tolerance
Key: HDFS-9866
URL: https://issues.apache.org/jira/browse/HDFS-9866
Project: Hadoop HDFS
Issue Type: Sub-task
Components: namenode
Affects Versions: 3.0.0
Reporter: Takuya Fukudome
Assignee: Jing Zhao
In [~tfukudom]'s system tests, we find the following issue:
A striped block group B has redundant internal block replicas. 9 internal
blocks are stored in 10 datanodes across 6 racks. Datanode d1 and d2 both store
a replica for internal block b1. d1's rack contains multiple internal blocks
while d2's rack only has b1. Then when choosing a duplicated replica to delete,
the current implementation may wrongly choose d2 thus causes the total number
of racks to be decreased to 5.
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