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From "Kim Haase (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-2872) Add Replication functionality to Derby
Date Thu, 03 Jan 2008 20:18:34 GMT

    [ https://issues.apache.org/jira/browse/DERBY-2872?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12555667#action_12555667
] 

Kim Haase commented on DERBY-2872:
----------------------------------

Another question: at several points the spec says that the slave "redoes" the transaction
log sent by the master. What does that mean exactly? Does it perform the operations that are
recorded in the transaction log? The last paragraph in "Starting and running replication"
implies that, but I just wanted to be sure.

Thanks very much.


> Add Replication functionality to Derby
> --------------------------------------
>
>                 Key: DERBY-2872
>                 URL: https://issues.apache.org/jira/browse/DERBY-2872
>             Project: Derby
>          Issue Type: New Feature
>          Components: Replication
>    Affects Versions: 10.4.0.0
>            Reporter: Jørgen Løland
>            Assignee: Jørgen Løland
>         Attachments: master_classes_1.pdf, poc_master_v2.diff, poc_master_v2.stat, poc_master_v2b.diff,
poc_slave_v2.diff, poc_slave_v2.stat, poc_slave_v2b.diff, poc_slave_v2c.diff, proof-of-concept_v2b-howto.txt,
proof_of_concept_master.diff, proof_of_concept_master.stat, proof_of_concept_slave.diff, proof_of_concept_slave.stat,
replication_funcspec.html, replication_funcspec_v2.html, replication_funcspec_v3.html, replication_funcspec_v4.html,
replication_funcspec_v5.html, replication_funcspec_v6.html, replication_funcspec_v7.html,
replication_funcspec_v8.html, replication_script.txt, slave_classes_1.pdf
>
>
> It would be nice to have replication functionality to Derby; many potential Derby users
seem to want this. The attached functional specification lists some initial thoughts for how
this feature may work.
> Dag Wanvik had a look at this functionality some months ago. He wrote a proof of concept
patch that enables replication by copying (using file system copy) and redoing the existing
Derby transaction log to the slave (unfortunately, I can not find the mail thread now).
> DERBY-2852 contains a patch that enables replication by sending dedicated logical log
records to the slave through a network connection and redoing these.
> Replication has been requested and discussed previously in multiple threads, including
these:
> http://mail-archives.apache.org/mod_mbox/db-derby-user/200504.mbox/%3c426E04C1.1070904@yahoo.de%3e
> http://www.nabble.com/Does-Derby-support-Transaction-Logging---t2626667.html

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