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From "Mukund Madhugiri (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3310) Lease recovery for append
Date Mon, 02 Jun 2008 17:25:45 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3310?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12601679#action_12601679
] 

Mukund Madhugiri commented on HADOOP-3310:
------------------------------------------

I did not have resources to do a 500 node run. Here are the results for a 100 node run. Please
let me know that works?

Sort on 100 nodes with *trunk*: time in minutes
- Random Writer: 15.96
- Sort: 52.92
- Validation: 11.94

Sort on 100 nodes with *trunk + patch*: time in minutes
- Random Writer: 14.76
- Sort: 53.76
- Validation: 11.46



> Lease recovery for append
> -------------------------
>
>                 Key: HADOOP-3310
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3310
>             Project: Hadoop Core
>          Issue Type: New Feature
>          Components: dfs
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>         Attachments: 3310_20080514.patch, 3310_20080516b.patch, 3310_20080516c.patch,
3310_20080519.patch, 3310_20080519b.patch, 3310_20080520.patch, 3310_20080521.patch, 3310_20080522b.patch,
3310_20080522c.patch, 3310_20080523.patch, 3310_20080524_dhruba.patch, 3310_20080527.patch,
3310_20080528.patch, 3310_20080528b.patch, 3310_20080528c.patch, 3310_20080529.patch, 3310_20080529b.patch,
3310_20080529c.patch
>
>
> In order to support file append, a GenerationStamp is associated with each block.  Lease
recovery will be performed when there is a possibility that the replicas of a block in a lease
may have different GenerationStamp values.
> For more details, see the documentation in HADOOP-1700.

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