Lei (Eddy) Xu created HADOOP-12148:
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Summary: Expose the stats of IOErrors on each FsVolume through JMX
Key: HADOOP-12148
URL: https://issues.apache.org/jira/browse/HADOOP-12148
Project: Hadoop Common
Issue Type: Improvement
Components: metrics
Affects Versions: 2.7.0
Reporter: Lei (Eddy) Xu
Assignee: Lei (Eddy) Xu
Currently, once DataNode hits an {{IOError}} when writing / reading block
files, it starts a background {{DiskChecker.checkDirs()}} thread. But if this
thread successfully finishes, DN does not record this {{IOError}}.
We need one measurement to count all {{IOErrors}} for each volume.
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