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From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-9866) BlockManager#chooseExcessReplicasStriped may weaken rack fault tolerance
Date Fri, 26 Feb 2016 23:00:19 GMT
Jing Zhao created HDFS-9866:
-------------------------------

             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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