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https://issues.apache.org/jira/browse/HDFS-3220?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13713215#comment-13713215
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Jean-Daniel Cryans commented on HDFS-3220:
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Hey [~eli], I did see this in "real life", see the whole comment here:
https://issues.apache.org/jira/browse/HBASE-8919?focusedCommentId=13713211&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13713211
> Improve some block recovery log messages
> ----------------------------------------
>
> Key: HDFS-3220
> URL: https://issues.apache.org/jira/browse/HDFS-3220
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Eli Collins
>
> FsDatasetImpl has three cases that throw exceptions with the message "THIS IS
> NOT SUPPOSED TO HAPPEN". These could happen in real life (eg with a corrupt
> block file). Let's improve these messages to indicate what case we've
> actually hit instead of this message, which isn't very useful.
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