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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
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Ivan Kelly commented on HDFS-1580:
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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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