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Date: Wed, 30 Mar 2011 09:46:05 +0000 (UTC)
From: "Ivan Kelly (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-1580) Add interface for generic Write
 Ahead Logging mechanisms
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    [ https://issues.apache.org/jira/browse/HDFS-1580?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13012898#comment-13012898 ] 

Ivan Kelly commented on HDFS-1580:
----------------------------------

I'd like to keep the pluggable bit (JournalFactory, or JournalWriter&JournalReader) to one interface for ease of configuration. Otherwise when a user specifies a custom journal type in their configuration, they'll have to specify the class for the Writer and for the Reader.

The EditLogOutputStream i proposed won't coexist with the current EditLogOutputStream, it will replace it. We need a single interface for writing the edit log, so that FSEditLog can loop through all the streams and treat them the same.

I like the idea of TxnRecord.

> Add interface for generic Write Ahead Logging mechanisms
> --------------------------------------------------------
>
>                 Key: HDFS-1580
>                 URL: https://issues.apache.org/jira/browse/HDFS-1580
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Ivan Kelly
>         Attachments: HDFS-1580+1521.diff, HDFS-1580.diff, generic_wal_iface.pdf, generic_wal_iface.pdf, generic_wal_iface.pdf, generic_wal_iface.txt
>
>


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