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From "He Xiaoqiao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-14421) HDFS block two replicas exist in one DataNode
Date Mon, 15 Apr 2019 14:11:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-14421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16818000#comment-16818000
] 

He Xiaoqiao commented on HDFS-14421:
------------------------------------

[~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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