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https://issues.apache.org/jira/browse/HDFS-955?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12852889#action_12852889
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Suresh Srinivas commented on HDFS-955:
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+1 for the patch. BTW thanks for documenting various directories under storage
directories. It adds more clarity to the code, save namespace, upgrade
mechanisms.
> FSImage.saveFSImage can lose edits
> ----------------------------------
>
> Key: HDFS-955
> URL: https://issues.apache.org/jira/browse/HDFS-955
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 0.20.1, 0.21.0, 0.22.0
> Reporter: Todd Lipcon
> Assignee: Konstantin Shvachko
> Priority: Blocker
> Attachments: FSStateTransition7.htm, hdfs-955-moretests.txt,
> hdfs-955-unittest.txt, PurgeEditsBeforeImageSave.patch,
> saveNamespace-0.20.patch, saveNamespace-0.21.patch, saveNamespace.patch,
> saveNamespace.patch, saveNamespace.patch, saveNamespace.patch,
> saveNamespace.txt
>
>
> This is a continuation of a discussion from HDFS-909. The FSImage.saveFSImage
> function (implementing dfsadmin -saveNamespace) can corrupt the NN storage
> such that all current edits are lost.
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