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Posted to derby-dev@db.apache.org by "Ole Solberg (JIRA)" <ji...@apache.org> on 2007/10/05 10:11:51 UTC
[jira] Commented: (DERBY-2872) Add Replication functionality to
Derby
[ https://issues.apache.org/jira/browse/DERBY-2872?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12532591 ]
Ole Solberg commented on DERBY-2872:
------------------------------------
I have experimented with the 'proof-of-concept_v2b' code running several derby tests (ij and junit) as "load" against the master server.
When running the ....tests.derbynet.PrepareStatementTest I get a '.Something wrong with the instants!' message and the slave server dies:
.
.
runUserCommand runUserCommandRemotely runTest testBasicPrepare used 340 ms .
startServer@atum02:4527 pDoR ...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................Something wrong with the instants!
startServer@atum02:4527 pDoR (RPlR) Log instant: 2, 410117
startServer@atum02:4527 pDoR (RPlR) ... returned instant: 2, 311861
startServer@atum02:4527 pDoR (RPlR) ... diff: 98256
startServer@atum02:4527 pDoR
startServer@atum02:4527 pDoR - - - - - - next log record - - - - - -
.
.
> Add Replication functionality to Derby
> --------------------------------------
>
> Key: DERBY-2872
> URL: https://issues.apache.org/jira/browse/DERBY-2872
> Project: Derby
> Issue Type: New Feature
> Components: Miscellaneous
> 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, 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_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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