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From "Zhe Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8320) Erasure coding: consolidate striping-related terminologies
Date Tue, 05 May 2015 05:52:06 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8320?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14527973#comment-14527973
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Zhe Zhang commented on HDFS-8320:
---------------------------------

Thanks Nicholas! Updated.

> Erasure coding: consolidate striping-related terminologies
> ----------------------------------------------------------
>
>                 Key: HDFS-8320
>                 URL: https://issues.apache.org/jira/browse/HDFS-8320
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Zhe Zhang
>            Assignee: Zhe Zhang
>
> Right now we are doing striping-based I/O in a number of places:
> # Client output stream (HDFS-7889)
> # Client input stream
> #* pread (HDFS-7782, HDFS-7678)
> #* stateful read (HDFS-8033, HDFS-8281, HDFS-8319)
> # DN reconstruction (HDFS-7348)
> In each place we use one or multiple of the following terminologies:
> # Cell
> # Stripe
> # Block group
> # Internal block
> # Chunk
> This JIRA aims to systematically define these terminologies in relation with each other
and in the context of the containing file. For example, a cell belong to stripe _i_ and internal
block _j_ can be indexed as {{(i, j)}} and its logical index _k_ in the file can be calculated.
> With the above consolidation, hopefully we can further consolidate striping I/O codes.



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