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From "Kristian Waagan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-2852) Derby: Replication and Availability
Date Tue, 14 Aug 2012 14:41:37 GMT

    [ https://issues.apache.org/jira/browse/DERBY-2852?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13434158#comment-13434158
] 

Kristian Waagan commented on DERBY-2852:
----------------------------------------

It's been a long time, but does anyone know the present state of this issue?
>From what I can see, there appears to be an ICLA on file ([1]), although I'm not 100%
sure it's for the right person.

However, replication has already been added (see DERBY-2872). Should this issue be closed,
or is it still valuable in some sense and should remain open?


Thanks,

[1]  http://people.apache.org/committer-index.html
                
> Derby: Replication and Availability
> -----------------------------------
>
>                 Key: DERBY-2852
>                 URL: https://issues.apache.org/jira/browse/DERBY-2852
>             Project: Derby
>          Issue Type: Improvement
>          Components: Network Server, Services, SQL, Store
>    Affects Versions: 10.2.2.0
>            Reporter: Egil Sørensen
>         Attachments: derby-rep.zip, repl_trunk.diff, repl_trunk_ignored.diff, repl_trunk.stat,
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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