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Date: Wed, 4 Mar 2009 15:21:56 -0800 (PST)
From: "Tsz Wo (Nicholas), SZE (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-5384) DataNodeCluster should not create
 blocks with generationStamp == 1
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    [ https://issues.apache.org/jira/browse/HADOOP-5384?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12678983#action_12678983 ] 

Tsz Wo (Nicholas), SZE commented on HADOOP-5384:
------------------------------------------------

> NameNode can reject such blocks, but dieing does not seem correct.
Agree.  This is going to be fixed in HADOOP-5399.

Tested the patch manually.  It fixes the problem with DataNodeCluster.  Since the patch is simple, I won't add new unit tests.

> DataNodeCluster should not create blocks with generationStamp == 1
> ------------------------------------------------------------------
>
>                 Key: HADOOP-5384
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5384
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: test
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>            Priority: Blocker
>             Fix For: 0.19.2, 0.20.0
>
>         Attachments: 5384_20090303.patch
>
>
> In DataNodeCluster.main(..), injected blocks are created with generationStamp == 1, which is a reserved value but not a valid generation stamp.  As a consequence, NameNode may die when those blocks are reported.

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