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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HDFS-265) Revisit append
Date Thu, 06 Aug 2009 18:09:14 GMT

     [ https://issues.apache.org/jira/browse/HDFS-265?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Hairong Kuang updated HDFS-265:
-------------------------------

    Attachment: appendDesign2.pdf

Thanks Konstantin and Suresh for their time reading the append design document and for their
valuable feedback. Here is an updated version. Major changes include:
1. Change GS/len finalized block state to be Committed Block state
2. Add how to persist block/replica states and how to handle DataNode upgrade
2. Add how to handle access token error
3. Add how to handle the case when pipeline becomes empty
4.Rewrite sections 3.1 and 3.2 and redraw pictures in these section to make idea clearer.

> Revisit append
> --------------
>
>                 Key: HDFS-265
>                 URL: https://issues.apache.org/jira/browse/HDFS-265
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Hairong Kuang
>            Assignee: Hairong Kuang
>         Attachments: appendDesign.pdf, appendDesign.pdf, appendDesign1.pdf, appendDesign2.pdf,
AppendSpec.pdf, AppendTestPlan.html, AppendTestPlan.html, AppendTestPlan.html, TestPlanAppend.html
>
>
> HADOOP-1700 and related issues have put a lot of efforts to provide the first implementation
of append. However, append is such a complex feature. It turns out that there are issues that
were initially seemed trivial but needs a careful design. This jira revisits append, aiming
for a design and implementation supporting a semantics that are acceptable to its users.

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