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https://issues.apache.org/jira/browse/HADOOP-2655?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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dhruba borthakur updated HADOOP-2655:
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Attachment: copyOnWrite.patch
This patch does a copy-on-write for blocks that need modification but were
linked to an existing snapshot. As part of this patch, the two maps in the
datanode (volumeMap and blockMap) are combined into one single map.
> Copy on write for data and metadata files in the presence of snapshots
> ----------------------------------------------------------------------
>
> Key: HADOOP-2655
> URL: https://issues.apache.org/jira/browse/HADOOP-2655
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs
> Reporter: dhruba borthakur
> Attachments: copyOnWrite.patch
>
>
> If a DFS Client wants to append data to an existing file (appends,
> HADOOP-1700) and a snapshot is present, the Datanoed has to implement some
> form of a copy-on-write for writes to data and meta data files.
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