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https://issues.apache.org/jira/browse/HDFS-576?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Konstantin Shvachko updated HDFS-576:
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Attachment: NewBlockReport.patch
This patch introduces
# {{ReplicaUnderConstruction}} as a storage for non-finalized replicas in
{{BlockUnderConstruction}}.
# New block-report structure. According to the specs it contains (logically)
two arrays of longs: one for finalized replicas and another for uc-replicas.
# The two logical arrays are physically implemented as one array of longs that
has a header, containing the lengths of the two logical arrays. The logical
arrays are delimited by an illegal block.
# Data-nodes send the new block report with all finalized and uc-replicas, but
not the temporary ones.
# The preport processing logic on the name-node is not fully implemented. It is
restricted to process finalized and rwr blocks exactly as the current
implementation does. The block report processing will be implemented in the
subsequent patch.
> Extend Block report to include under-construction replicas
> ----------------------------------------------------------
>
> Key: HDFS-576
> URL: https://issues.apache.org/jira/browse/HDFS-576
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: data-node, name-node
> Affects Versions: Append Branch
> Reporter: Konstantin Shvachko
> Assignee: Konstantin Shvachko
> Fix For: Append Branch
>
> Attachments: BlockReport.htm, NewBlockReport.patch
>
>
> Current data-node block reports report only finalized (in append terminology)
> blocks. Data-nodes should report all block replicas except for the temporary
> ones so that clients could read from incomplete replicas and to make block
> recovery possible.
> The attached design document goes into more details of the new block reports.
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