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https://issues.apache.org/jira/browse/HDFS-1580?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ivan Kelly updated HDFS-1580:
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Attachment: HDFS-1580.diff
This is the final piece to allow the loading of custom implementations of
JournalManager. There is another change HDFS-2334 which adds closeable to
JournalManager, but that may not be absolutely necessary for all journal types.
(it is for bookkeeper)
There's 2 changes:
1) I've changes the interfaces(JournalManager, EditLogInputStream &
EditLogOutputStream) so that they can be implemented outside of the
org.apache.hadoop.hdfs.server.namenode.
2) Pluggable creation of journal managers.
When FSEditLog is creating JournalManagers from dfs.namenode.edits.dir, and it
encounters a URI with a schema different to "file" it loads the name of the
implementing class from "dfs.namenode.edits.journal-plugin.<schema>". This
class must implement JournalManager and have a constructor which takes
(Configuration, URI).
> 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
> Assignee: Jitendra Nath Pandey
> Fix For: HA branch (HDFS-1623), 0.24.0
>
> Attachments: EditlogInterface.1.pdf, EditlogInterface.2.pdf,
> EditlogInterface.3.pdf, HDFS-1580+1521.diff, HDFS-1580.diff, HDFS-1580.diff,
> HDFS-1580.diff, HDFS-1580.diff, generic_wal_iface.pdf, generic_wal_iface.pdf,
> generic_wal_iface.pdf, generic_wal_iface.txt
>
>
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