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From "Vinayakumar B (JIRA)" <j...@apache.org>
Subject [jira] [Deleted] (HDFS-10066) CLONE - Erasure coding: consolidate striping-related terminologies
Date Tue, 15 Mar 2016 09:42:38 GMT

     [ https://issues.apache.org/jira/browse/HDFS-10066?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vinayakumar B deleted HDFS-10066:
---------------------------------


> CLONE - Erasure coding: consolidate striping-related terminologies
> ------------------------------------------------------------------
>
>                 Key: HDFS-10066
>                 URL: https://issues.apache.org/jira/browse/HDFS-10066
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: dragon
>            Assignee: Zhe Zhang
>             Fix For: 3.0.0
>
>
> 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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