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https://issues.apache.org/jira/browse/HDFS-3947?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Colin Patrick McCabe updated HDFS-3947:
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Attachment: HDFS-3947-b1.001.patch
The bulk of this patch is improving TestNameNodeRecovery to deal with having
two edit log directories.
> If there are multiple edit logs with the same fstime, Recovery Mode should
> load a different one than the normal loading process
> -------------------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-3947
> URL: https://issues.apache.org/jira/browse/HDFS-3947
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: 1.2.0
> Reporter: Colin Patrick McCabe
> Assignee: Colin Patrick McCabe
> Priority: Minor
> Attachments: HDFS-3947-b1.001.patch
>
>
> If there are multiple edit logs with the same {{fstime}}, Recovery Mode
> should load a different one than the normal loading process. This will
> protect against many common kinds of corruption which affect only one edit
> log directory. For example, most I/O errors would fall into this category.
> This improvement is not necessary in branch-2 and later branches because in
> those branches, we have edit log failover (See HDFS-3049). However, this is
> an extremely simple and useful thing we can do to make Recovery Mode more
> helpful in branch-1.
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