[GitHub] [hadoop] Zhangshunyu commented on pull request #2655: HDFS-15714: HDFS Provided Storage Read/Write Mount Support On-the-fly

[GitBox <gi...@apache.org>]

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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