[
https://issues.apache.org/jira/browse/QPID-7435?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Lorenz Quack resolved QPID-7435.
--------------------------------
Resolution: Fixed
looks good to me
> 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-6.1
>
>
> 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.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
