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https://issues.apache.org/jira/browse/QPID-7435?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15924632#comment-15924632
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ASF subversion and git services commented on QPID-7435:
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Commit 1786938 from [~k-wall] in branch 'java/branches/6.0.x'
[ https://svn.apache.org/r1786938 ]
QPID-7435: [Java Broker] Avoid the retrieval of the dummy single byte entry
when traversing message instance cursors.
svn merge -c 1762070 ^/qpid/java/branches/6.1.x
> Avoid BDB fetching dummy single byte database entries during message instance
> recovery
> --------------------------------------------------------------------------------------
>
> Key: QPID-7435
> URL: https://issues.apache.org/jira/browse/QPID-7435
> Project: Qpid
> Issue Type: Improvement
> Components: Java Broker
> Reporter: Keith Wall
> Assignee: Keith Wall
> Fix For: qpid-java-6.0.7, qpid-java-6.1
>
>
> We represent message instances in BDB as a tuple comprising a key (formed of
> queue id and message id) and a dummy record (formed of 1 byte). The dummy
> record serves no purpose other than to fulfil the contract with JE's
> Database#put() which cannot accept a null entry value.
> The JE API has a mechanism to instruct a cursor operations to retrieve only
> the key values. We can exploit this feature when recovering message
> instances to suppress the retrieval of the dummy entry.
> On my box, this improves (synchronous) recovery time for a store containing 4
> queues with 2,000,000 messages from about 1min to about 30seconds. This
> should benefit any user who uses BDB and has a large store.
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