Zhangshunyu commented on pull request #2655:
URL: https://github.com/apache/hadoop/pull/2655#issuecomment-787600101
@PHILO-HE Thanks for the reply. Please find the error msg:
```
ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: Exception in
creating BlockSender: {}
org.apache.hadoop.hdfs.server.datanode.ReplicaNotFoundException: Replica not
found for BP-1079229821-192.168.0.156-1614366591560:blk_1073791203_50379. The
block may have been removed recently by the balancer or by intentionally
reducing the replication factor. This condition is usually harmless. To be
certain, please check the preceding datanode log messages for signs of a more
serious issue.
```
we use readOnly mount mode, the data is stored on s3 store, after mount we
read the data use readthrough mode, we find that some times the datanode will
throw this exception, it seems the read op request send to the wrong datanode?
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