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Date: Tue, 20 May 2008 14:14:55 -0700 (PDT)
From: "dhruba borthakur (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-3310) Lease recovery for append
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    [ https://issues.apache.org/jira/browse/HADOOP-3310?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12598472#action_12598472 ] 

dhruba borthakur commented on HADOOP-3310:
------------------------------------------

One comment: The primary datanode makes an RPC call to the secondary datanode(s) to stamp the generationStamp for a block. As part of processing this request, the secondary datanode(s) should first terminate any threads that are currently writing to that block before returning "success" to this RPC. The threads that are currently writing to a block can be found in FSDataset.ActiveFile.threads.


> 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
>
>
> 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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