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https://issues.apache.org/jira/browse/HADOOP-3310?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12599503#action_12599503
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Tsz Wo (Nicholas), SZE commented on HADOOP-3310:
------------------------------------------------
I tried to test the patch for lease expiry. It does not work yet since we
still write block to a tmp file first. FSDataset.validateBlockFile() will fail
during lease recovery.
Also, FSDataset.volumeMap should use block id as key, instead of block (which
compares both id and generation stamp) since the generation stamp may be not
known.
> 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
>
>
> 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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