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https://issues.apache.org/jira/browse/HADOOP-6467?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12796437#action_12796437
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Hong Tang commented on HADOOP-6467:
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Some general comments on the document:
- Should mention that the outputDirectory must end with ".har".
- Can we do away with the file names for a directory in the index file now that
all files under the same directory should be clustered in a contiguous region
in the index file?
- How is FileStatus serialized? Assuming you use FileStatus.Writable, then we
need to make sure that FileStatus serialization format being kept stable.
- Should explicitly mention that forward compatibility is not maintained.
> Performance improvement for liststatus on directories in hadoop archives.
> -------------------------------------------------------------------------
>
> Key: HADOOP-6467
> URL: https://issues.apache.org/jira/browse/HADOOP-6467
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Mahadev konar
> Assignee: Mahadev konar
> Fix For: 0.22.0
>
> Attachments: Archives_performance.docx
>
>
> A liststatus call on a directory in hadoop archives leads to ( 2* number of
> files in directory) open calls to the namenode. This is very sub optimal and
> needs to be fixed to make it performant enough to be used on a daily basis.
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