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Posted to mapreduce-issues@hadoop.apache.org by "Tsz Wo (Nicholas), SZE (JIRA)" <ji...@apache.org> on 2011/03/01 22:42:36 UTC
[jira] Commented: (MAPREDUCE-2302) Add static factory methods in
GaloisField
[ https://issues.apache.org/jira/browse/MAPREDUCE-2302?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13001130#comment-13001130 ]
Tsz Wo (Nicholas), SZE commented on MAPREDUCE-2302:
---------------------------------------------------
{code}
+ int key = ((fieldSize << 16) & 0xFF00) + (primitivePolynomial & 0xFF);
{code}
Since the shift is 16, should the masks be 0xFFFF0000 and 0xFFFF?
> Add static factory methods in GaloisField
> -----------------------------------------
>
> Key: MAPREDUCE-2302
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2302
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: contrib/raid
> Reporter: Scott Chen
> Assignee: Scott Chen
> Attachments: MAPREDUCE-2302.2.txt, MAPREDUCE-2302.txt
>
>
> GaloisField is immutable and should be kept reuse after creation to avoid redundant calculation of the multiplication and division tables.
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