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https://issues.apache.org/jira/browse/HDFS-7678?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zhe Zhang updated HDFS-7678:
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Attachment: HDFS-7678-HDFS-7285.11.patch
I originally planned to consolidate striping terminologies under HDFS-8320 but
it seems necessary to do some of the consolidation now. 011 patch updates the
definition of a {{Stripe}}, which covers an arbitrary range from all internal
blocks (same coverage for each internal block), a {{StripingCell}}, a
{{StripingChunk}}. Using these new tools {{DFSStripedInputStream}} has a much
simpler logic to read a {{Stripe}}, which in turn reads individual
{{StripingChunk}}'s. Right now the patch is not completed but posting here for
some feedback on the direction.
With this structure, all complexities are migrated to abstract number-crunching
in {{StripedBlockUtil}}, which can be easily and extensively unit-tested.
> Erasure coding: DFSInputStream with decode functionality (pread)
> ----------------------------------------------------------------
>
> Key: HDFS-7678
> URL: https://issues.apache.org/jira/browse/HDFS-7678
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Affects Versions: HDFS-7285
> Reporter: Li Bo
> Assignee: Zhe Zhang
> Attachments: BlockGroupReader.patch, HDFS-7678-HDFS-7285.002.patch,
> HDFS-7678-HDFS-7285.003.patch, HDFS-7678-HDFS-7285.004.patch,
> HDFS-7678-HDFS-7285.005.patch, HDFS-7678-HDFS-7285.006.patch,
> HDFS-7678-HDFS-7285.007.patch, HDFS-7678-HDFS-7285.008.patch,
> HDFS-7678-HDFS-7285.009.patch, HDFS-7678-HDFS-7285.010.patch,
> HDFS-7678-HDFS-7285.11.patch, HDFS-7678.000.patch, HDFS-7678.001.patch
>
>
> A block group reader will read data from BlockGroup no matter in striping
> layout or contiguous layout. The corrupt blocks can be known before
> reading(told by namenode), or just be found during reading. The block group
> reader needs to do decoding work when some blocks are found corrupt.
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