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From "Ivan Kelly (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1580) Add interface for generic Write Ahead Logging mechanisms
Date Wed, 30 Mar 2011 09:46:05 GMT

    [ 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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