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https://issues.apache.org/jira/browse/DERBY-2852?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12517844
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Egil Sørensen commented on DERBY-2852:
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I am terribly sorry that I have not yet submitted the ICLA, I have signed it
already, but had to wait for a final clearance from the University that the
source code was mine to donate. I will send it tomorrow, you should have it
within the week.
Sorry for the inconvenience.
> 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, repl_trunk.diff, repl_trunk.stat,
> repl_trunk_ignored.diff, 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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