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https://issues.apache.org/jira/browse/HDFS-3521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13294591#comment-13294591
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Tsz Wo (Nicholas), SZE commented on HDFS-3521:
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If corruption toleration is undesirable, the feature could be turned off.
UNCHECKED_REGION_LENGTH is to skip checking the last 1MB. If this region is
checked, corruption could be found. Skipping checking may simply lead to
undetected corruption but not the same as no corruption.
> Allow namenode to tolerate edit log corruption
> ----------------------------------------------
>
> Key: HDFS-3521
> URL: https://issues.apache.org/jira/browse/HDFS-3521
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: name-node
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Tsz Wo (Nicholas), SZE
> Fix For: 1.2.0
>
> Attachments: h3521_20120610_b-1.patch, h3521_20120611_b-1.0.patch,
> h3521_20120611_b-1.patch
>
>
> HDFS-3479 adds checking for edit log corruption. It uses a fixed
> UNCHECKED_REGION_LENGTH (=PREALLOCATION_LENGTH) so that the bytes at the end
> within the length is not checked. Instead of not checking the bytes, we
> should check everything and allow toleration.
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