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https://issues.apache.org/jira/browse/HDFS-9866?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jing Zhao updated HDFS-9866:
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Status: Patch Available (was: Open)
> 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
> Attachments: HDFS-9866.000.patch
>
>
> 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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