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From Jørgen Løland (JIRA) <j...@apache.org>
Subject [jira] Updated: (DERBY-2926) Replication: Add a log buffer for log records that should be shipped to the slave
Date Wed, 25 Jul 2007 10:04:31 GMT

     [ https://issues.apache.org/jira/browse/DERBY-2926?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jørgen Løland updated DERBY-2926:
---------------------------------

    Attachment: bytebuffer_v1a.stat
                bytebuffer_v1a.diff

Patch v1a replaces patch v1. It removes two methods that were used in testing, but is otherwise
equal.

> Replication: Add a log buffer for log records that should be shipped to the slave
> ---------------------------------------------------------------------------------
>
>                 Key: DERBY-2926
>                 URL: https://issues.apache.org/jira/browse/DERBY-2926
>             Project: Derby
>          Issue Type: Sub-task
>          Components: Services
>    Affects Versions: 10.4.0.0
>            Reporter: Jørgen Løland
>            Assignee: Jørgen Løland
>             Fix For: 10.4.0.0
>
>         Attachments: bytebuffer_v1.diff, bytebuffer_v1.stat, bytebuffer_v1a.diff, bytebuffer_v1a.stat
>
>
> When a Derby instance has the master role for a database, log records are shipped to
the slave to keep it up to date. A buffer is needed because the log records should not be
shipped one at a time. Also, writing the log records to a buffer instead of sending them immediately
removes the network communication from the critical path for the transaction.

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