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https://issues.apache.org/jira/browse/HADOOP-3193?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12586252#action_12586252
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dhruba borthakur commented on HADOOP-3193:
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When a client discovers a corrupt block, it reports it to the namenode. The
Namenode logs a "ReportBadBlock message" it in the namenode log. One
improvement would be to enhance the log message to print the blockId(s) as well!
Another improvement would be to report the number of corrupted blocks through
the HadoopMetrics API.
> Discovery of corrupt block reported in name node log
> ----------------------------------------------------
>
> Key: HADOOP-3193
> URL: https://issues.apache.org/jira/browse/HADOOP-3193
> Project: Hadoop Core
> Issue Type: New Feature
> Components: dfs
> Reporter: Robert Chansler
>
> Any discovery of a corrupt/unreadable block must be reported in the name node
> log.
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