hadoop-mapreduce-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Scott Chen (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAPREDUCE-2267) Parallelize reading of blocks within a stripe
Date Wed, 02 Feb 2011 20:44:29 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-2267?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Scott Chen updated MAPREDUCE-2267:

    Hadoop Flags: [Reviewed]
          Status: Patch Available  (was: Open)

> Parallelize reading of blocks within a stripe
> ---------------------------------------------
>                 Key: MAPREDUCE-2267
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2267
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: contrib/raid
>    Affects Versions: 0.22.0
>            Reporter: Ramkumar Vadali
>            Assignee: Ramkumar Vadali
>         Attachments: MAPREDUCE-2267.1.patch, MAPREDUCE-2267.2.patch, MAPREDUCE-2267.3.patch,
MAPREDUCE-2267.4.patch, MAPREDUCE-2267.patch
> RAID code has several instances where several blocks of data have to be read to perform
an operation. For example, computing a parity block requires reading the blocks of the source
file. Similarly, generating a fixed block requires reading a parity block and the good blocks
from the source file. These read operations proceed sequentially currently. RAID code should
use a thread pool to increase the parallelism and thus reduce latency.

This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira


View raw message