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https://issues.apache.org/jira/browse/HADOOP-1762?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Raghu Angadi updated HADOOP-1762:
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Attachment: HADOOP-1762.patch
This patch includes (2) as well : Deprecates {{OP_DATANODE_ADD}} and
{{OP_DATANODE_REMOVE}}.
> Namenode does not need to store storageID and datanodeID persistently
> ---------------------------------------------------------------------
>
> Key: HADOOP-1762
> URL: https://issues.apache.org/jira/browse/HADOOP-1762
> Project: Hadoop
> Issue Type: Improvement
> Components: dfs
> Affects Versions: 0.14.0
> Reporter: Raghu Angadi
> Assignee: Raghu Angadi
> Attachments: HADOOP-1762-Opt2.patch, HADOOP-1762-Opt2.patch,
> HADOOP-1762-Opt2.patch, HADOOP-1762-Opt2.patch, HADOOP-1762-Opt2.patch,
> HADOOP-1762.patch, HADOOP-1762.patch
>
>
> Currently Namenode stores all the storage-ids it generates since the
> beginning (since last format). It allocates a new storageID everytime a new
> datanode comes online. It also stores all the known datanode ids since the
> beginning.
> It would be better if Namenode did not have to keep track of these. I will
> describe a proposal in the next comment.
> This has implecations regd how Namenode helps administrators identify 'dead
> datanodes' etc. These issues are addressed in HADOOP-1138.
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