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Posted to dev@bookkeeper.apache.org by "Sijie Guo (JIRA)" <ji...@apache.org> on 2012/09/04 15:11:08 UTC
[jira] [Closed] (BOOKKEEPER-78) filterable metadata fields in
Hedwig's message definition
[ https://issues.apache.org/jira/browse/BOOKKEEPER-78?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Sijie Guo closed BOOKKEEPER-78.
-------------------------------
Assignee: (was: Sijie Guo)
> filterable metadata fields in Hedwig's message definition
> ---------------------------------------------------------
>
> Key: BOOKKEEPER-78
> URL: https://issues.apache.org/jira/browse/BOOKKEEPER-78
> Project: Bookkeeper
> Issue Type: New Feature
> Components: hedwig-client, hedwig-server
> Reporter: Matthieu Morel
> Fix For: 4.2.0
>
> Attachments: BOOKKEEPER-78.patch, BOOKKEEPER-78.patch_v2
>
>
> In order to efficiently implement filtering of Hedwig messages, Hedwig should be able to rely on metadata information. (i.e. without needing to deserialize the content of the message)
> Filtering could use a subset of SQL (like in the JMS spec), leading to queries such as :
> "header1 like 'a' AND header2 IS NOT NULL"
> For that purpose, I propose to add customizable metadata to the definition of Hedwig messages, as header fields.
> Metadata must be customizable because it may be arbitrary. We should provide "map-like" containers according to the type of the metadata field. Metadata fields would be accessed by name.
> There are predefined headers for JMS that could be added as metadata fields such as : destination (~topic), delivery mode (persistent or not), expiration, priority, timestamp, correlation id (link to other message), reply to, type and redelivered. I think only a subset of these should be predefined headers, if any.
> Adding metadata fields to Hedwig messages implies modifying the message definition, which does not break backward compatibility when those fields are added as optional in the protocol buffer definition.
>
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