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https://issues.apache.org/jira/browse/HDFS-1505?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13032692#comment-13032692
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Matt Foley commented on HDFS-1505:
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Hi Aaron, agree with you that storage directories of type IMAGE_AND_EDITS are a
distinct NameNodeDirType. However, my understanding of
NNStorage.getNumStorageDirs(NameNodeDirType), and NameNodeDirType.isOfType() is
that membership queries (iterators or counts) about storage dirs of type EDITS
return answers relating to all storage dirs of type EDITS || IMAGE_AND_EDITS,
while queries about storage dirs of type IMAGE return answers relating to all
storage dirs of type IMAGE || IMAGE_AND_EDITS. That is, isOfType() is
permissive rather than exclusive.
I could be wrong of course :-) as it's possible I didn't correctly follow
overloaded implementations. Please let me know if so. Thanks.
> saveNamespace appears to succeed even if all directories fail to save
> ---------------------------------------------------------------------
>
> Key: HDFS-1505
> URL: https://issues.apache.org/jira/browse/HDFS-1505
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 0.22.0, 0.23.0
> Reporter: Todd Lipcon
> Assignee: Aaron T. Myers
> Priority: Blocker
> Fix For: 0.22.0
>
> Attachments: hdfs-1505-22.0.patch, hdfs-1505-22.1.patch,
> hdfs-1505-test.txt, hdfs-1505-trunk.0.patch, hdfs-1505-trunk.1.patch
>
>
> After HDFS-1071, saveNamespace now appears to "succeed" even if all of the
> individual directories failed to save.
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