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From "Lei (Eddy) Xu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-12148) Expose the stats of IOErrors on each FsVolume through JMX
Date Mon, 29 Jun 2015 23:41:04 GMT
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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