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Posted to common-dev@hadoop.apache.org by "Chris Douglas (JIRA)" <ji...@apache.org> on 2009/04/11 02:24:14 UTC

[jira] Updated: (HADOOP-5657) Validate data passed through TestReduceFetch

     [ https://issues.apache.org/jira/browse/HADOOP-5657?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Chris Douglas updated HADOOP-5657:
----------------------------------

    Attachment: 5657-0.patch

The following are now validated in the reduce:
* Each map produces one record for each of 4096 small keys
* Includes unique large records, each straddled by a pair of small records from another map (to detect corruption from the merge)
* Changes some parameters for {{testReduceFromDisk}} to make intermediate merges with in-memory data occur occasionally

> Validate data passed through TestReduceFetch
> --------------------------------------------
>
>                 Key: HADOOP-5657
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5657
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: mapred, test
>            Reporter: Chris Douglas
>         Attachments: 5657-0.patch
>
>
> While TestReduceFetch verifies the reduce semantics for reducing from in-memory segments, it does not validate the data it reads. Data corrupted during the merge will not be detected.

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