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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-2926) Replication: Add a log buffer for log records that should be shipped to the slave
Date Tue, 21 Aug 2007 12:55:31 GMT

    [ https://issues.apache.org/jira/browse/DERBY-2926?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12521414
] 

Knut Anders Hatlen commented on DERBY-2926:
-------------------------------------------

Thanks for the new patch Jørgen. Your comments sound reasonable to me. Some new comments:

  - I assume the changes to index.html should be discarded.
  - ReplicationLogBuffer.validData() is synchronized on this. Did you mean outputLatch?
  - ReplicationLogBuffer.switchDirtyBuffer() mentions synchronized(this) in its javadoc. Should
it say listLatch?

> 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-fixheader.diff, bytebuffer_v1-fixheader.stat, bytebuffer_v1.diff,
bytebuffer_v1.stat, bytebuffer_v1a.diff, bytebuffer_v1a.stat, bytebuffer_v2.diff, bytebuffer_v2.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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