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https://issues.apache.org/jira/browse/DERBY-2872?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12533090
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V.Narayanan commented on DERBY-2872:
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>From the functional spec
>The NetworkServerCommand commands are executed by the main thread,
>which means that it is not possible to connect to the server acting
>as slave before failover has taken place. Will, of course, be fixed
>later.
The problem occurs because we are booting the slave as part of the
same thread and it is held up in recovery. Starting it in a separate
thread should solve this issue.
> 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/[EMAIL
> PROTECTED]
> http://www.nabble.com/Does-Derby-support-Transaction-Logging---t2626667.html
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