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https://issues.apache.org/jira/browse/HADOOP-3310?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12601537#action_12601537
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dhruba borthakur commented on HADOOP-3310:
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If this patch passes random-writer/sort on a reasonable size cluster (e.g. 500
nodes), it will be ready for "commit".
> 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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