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https://issues.apache.org/jira/browse/HDFS-4372?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13694413#comment-13694413
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Colin Patrick McCabe commented on HDFS-4372:
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Hi Chris,
This is interesting; thanks for tackling it.
Given that we read the FSImage from a file, why not just track our current
position in the FSImage file, plus its total size? That would be a lot simpler
than doing the INode number tracking.
Rather than having {{EditLogInputStream#isLengthKnown}} and
{{EditLogInputStream#length}}, would it make more sense to throw a checked
exception in the case where the length isn't known? Or return a special value
(I believe -1 is used in some cases?) It seems like the current API is
somewhat error-prone since someone could call length without first calling
isLengthKnown and get an undefined result.
> Track NameNode startup progress
> -------------------------------
>
> Key: HDFS-4372
> URL: https://issues.apache.org/jira/browse/HDFS-4372
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Affects Versions: 3.0.0
> Reporter: Chris Nauroth
> Assignee: Chris Nauroth
> Attachments: HDFS-4372.1.patch, HDFS-4372.2.patch
>
>
> Track detailed progress information about the steps of NameNode startup to
> enable display to users.
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