JunJieZhao created HDFS-17890:
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Summary: Avoid slow disks datanode when reading data
Key: HDFS-17890
URL: https://issues.apache.org/jira/browse/HDFS-17890
Project: Hadoop HDFS
Issue Type: Improvement
Components: hdfs
Reporter: JunJieZhao
During HDFS read operations, replicas on slow disks should be deprioritized so
that replicas on healthy disks are preferred.
Currently, slow disk avoidance is not performed at the disk level when reading
operations return to the block position.
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