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https://issues.apache.org/jira/browse/HADOOP-1774?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Raghu Angadi reopened HADOOP-1774:
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Dhruba, the above patch included a small unrelated change in
MiniDFSCluster.java. Sorry about that. I will submit a correction patch. I was
trying to see what caused HADOOP-1885.
> Remove use of INode.parent in Block CRC upgrade
> -----------------------------------------------
>
> Key: HADOOP-1774
> URL: https://issues.apache.org/jira/browse/HADOOP-1774
> Project: Hadoop
> Issue Type: Improvement
> Components: dfs
> Reporter: Raghu Angadi
> Assignee: Raghu Angadi
> Fix For: 0.15.0
>
> Attachments: HADOOP-1774.patch, HADOOP-1774.patch, HADOOP-1774.patch
>
>
> HADOOP-1687 proposes various reductions in Namenode memory. One of the 'cuts'
> is to remove 'parent' field in INodes (8 bytes per file). HADOOP-1743 already
> deprecates INode.getAbsoluteName() method.
> Block CRC Upgrade code still requires this field (blockID -> fileName ->
> parent -> INode for .crc file). If we don't want to use parent, we need to
> build INode-to-parent map at the beginning of the upgrade. Note this would
> increase memory required during upgrade by 50 bytes for each of non-crc files
> (50% of files). I would estimate this to be around 5% more memory.
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