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https://issues.apache.org/jira/browse/DERBY-2852?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12506901
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Daniel John Debrunner commented on DERBY-2852:
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Very interesting, I assume the diffs are against 10.2.2.0. Have you tried
applying it to the trunk, that's where it will need to go if it gets committed.
Before the Derby project can accept this you need to file an ICLA with the ASF
These pages on the Derby wiki has information for getting involved in the Derby
project.
http://wiki.apache.org/db-derby/DerbyDev
http://wiki.apache.org/db-derby/DerbyContributorChecklist
> Derby: Replication and Availability
> -----------------------------------
>
> Key: DERBY-2852
> URL: https://issues.apache.org/jira/browse/DERBY-2852
> Project: Derby
> Issue Type: New Feature
> Components: Network Server, Services, SQL, Store
> Affects Versions: 10.2.2.0
> Reporter: Egil Sørensen
> Attachments: derby-rep.zip, soereeg07, svn.diff
>
>
> This paper and attached source code describes the work done to add hot
> standby replication functionality to the Apache Derby Database Management
> System.
> By implementing a hot standby scheme in Apache Derby several features are
> added. The contents of the database is replicated at run time to another site
> providing online runtime backup. As the hot standby takes over on faults
> availability is added in that a client can connect to the hot standby after a
> crash. Thus the crash is masked from the clients. In addition to this, online
> upgrades of software and hardware can be done by taking down one database at
> the time. Then when
> the upgrade is completed the upgraded server is synchronized and back online
> with no downtime.
> A fully functional prototype of the Apache Derby hot standby scheme has been
> created in this project using logical logs, fail-fast takeovers and logical
> catchups after an internal up-to-crash recovery and reconnection. This
> project builds on the ideas that are presented in my earlier project: Derby:
> Write to Neighbor Mode.
> To enable the features described above some changes have been made to the
> Derby base system. The following classes have been changed or added:
> The Logical Log System
> org.apache.derby.iapi.store.logical.log.LogicalImage
> org.apache.derby.iapi.store.logical.log.LogicalLoggable
> org.apache.derby.impl.store.logical.log.LogicalLog
> org.apache.derby.impl.store.logical.log.LogicalLogger
> org.apache.derby.impl.store.logical.log.LogicalLogRecord
> org.apache.derby.impl.store.logical.opearations.LogicalAbortOperation
> org.apache.derby.impl.store.logical.opearations.LogicalCommitOperation
> org.apache.derby.impl.store.logical.opearations.LogicalDeleteOperation
> org.apache.derby.impl.store.logical.opearations.LogicalImage
> org.apache.derby.impl.store.logical.opearations.LogicalInsertOperation
> org.apache.derby.impl.store.logical.opearations.LogicalOperation
> org.apache.derby.impl.store.logical.opearations.LogicalOperationFactory
> org.apache.derby.impl.store.logical.opearations.LogicalUpdateOperation
> The SQL Layer
> org.apache.impl.sql.execute.RowChangerImpl
> org.apache.impl.sql.conn.GenericLanguageConnectionContext
> The Communications Service
> org.apache.derby.impl.services.net.LogicalServer
> org.apache.derby.impl.services.net.LogicalClient
> org.apache.derby.impl.services.net.NetworkPayload
> org.apache.derby.impl.services.net.receiver.LogReceiver
> org.apache.derby.impl.services.net.shipper.LogShipper
> org.apache.derby.impl.services.net.shipper.LogicalCatchUp
> The Hot Standby Service
> org.apache.derby.impl.services.hotstandby.HotStandbyController
> org.apache.derby.impl.services.hotstandby.Database
> The Network Server
> org.apache.derby.impl.drda.NetworkServerControlImpl
> org.apache.derby.impl.drda.HotStandbyPoller
> org.apache.derby.impl.drda.net.LogicalClient
> org.apache.derby.imp.drda.net.LogicalServer
> See the added paper for more thorough documentation on design choices and
> implementation along with some benchmarking results
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