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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-2345) new transactions to support HDFS Appends
Date Sun, 03 Feb 2008 09:44:07 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-2345?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

dhruba borthakur updated HADOOP-2345:

    Attachment: AppendTransactions.patch

This patch implements  the following two functionality:

1. A client can continue to write to a DFSOutputStream even if the namenode restarts! This
patch persist leases in the transaction log. Persisting leases is a pre-requisite for correct
error recovery for the HDFS file-append feature.

2. A new method NameNode.fsync() that lets a client persist metadata for a file into transaction

> new transactions to support HDFS Appends
> ----------------------------------------
>                 Key: HADOOP-2345
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2345
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: dfs
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>         Attachments: AppendTransactions.patch
> This JIRA adresses the changes needed to the transaction mechanism to support appending
data to existing HDFS files. The details of this design is documented in HADOOP-1700.

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