Yuanbo Liu created HDFS-14421:
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Summary: 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: Improvement
Reporter: Yuanbo Liu
We're using Hadoop-2.7.0.
There is a file which 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 exist in one Datande?
Hope to get anyone's comments. Thanks in advance.
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