Yang Yun created HDFS-15872:
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Summary: Add the failed reason to Metrics duiring choosing
Datanode.
Key: HDFS-15872
URL: https://issues.apache.org/jira/browse/HDFS-15872
Project: Hadoop HDFS
Issue Type: Improvement
Components: block placement, namenode
Environment: Add the failed reason to Metrics duiring choosing
Datanode.
Reporter: Yang Yun
Add the failed reason to metrics duiring choosing Datanode. So we can
troubleshoot or add storage related monitoring.
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