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https://issues.apache.org/jira/browse/HDFS-14421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16818000#comment-16818000
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He Xiaoqiao commented on HDFS-14421:
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[~yuanbo], thanks for your comments, I am still confused that why same block
located more than one replicas in one datanode instance even if change VERSION
files of different disks which belong to one datanode instance. looks forward
to your more digging information.
> HDFS block two replicas exist in one DataNode
> ---------------------------------------------
>
> Key: HDFS-14421
> URL: https://issues.apache.org/jira/browse/HDFS-14421
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Yuanbo Liu
> Priority: Major
> Attachments: 326942161.log
>
>
> We're using Hadoop-2.7.0.
> There is a file in the cluster and it's replication factor is 2. Those two
> replicas exist in one Datande. the fsck info is here:
> {color:#707070}BP-499819267-xx.xxx.131.201-1452072365222:blk_1400651575_326942161
> len=484045 repl=2
> [DatanodeInfoWithStorage[xx.xxx.80.205:50010,DS-d321be27-cbd4-4edd-81ad-29b3d021ee82,DISK],
>
> DatanodeInfoWithStorage[xx.xx.80.205:50010,DS-d321be27-cbd4-4edd-81ad-29b3d021ee82,DISK]].{color}
> and this is the exception from xx.xx.80.205
> {color:#707070}org.apache.hadoop.hdfs.server.datanode.ReplicaNotFoundException:
> Replica not found for
> BP-499819267-xx.xxx.131.201-1452072365222:blk_1400651575_326942161{color}
> It's confusing that why NameNode doesn't update block map after exception.
> What's the reason of two replicas existing in one Datande?
> Hope to get your comments. Thanks in advance.
>
>
>
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