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Lei (Eddy) Xu commented on HDFS-8694: ------------------------------------- The checkstyle warnings are false alarm. They complained about the length of the files. The failure test {{TestStandbyIsHot}} is not relevent. I can not produce it on my dev machine, and it seems to appear in other recent JIRAs. > Expose the stats of IOErrors on each FsVolume through JMX > --------------------------------------------------------- > > Key: HDFS-8694 > URL: https://issues.apache.org/jira/browse/HDFS-8694 > Project: Hadoop HDFS > Issue Type: Improvement > Components: datanode, HDFS > Affects Versions: 2.7.0 > Reporter: Lei (Eddy) Xu > Assignee: Lei (Eddy) Xu > Attachments: HDFS-8694.000.patch, HDFS-8694.001.patch > > > 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. -- This message was sent by Atlassian JIRA (v6.3.4#6332)