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SMILA/Specifications/Partitioning Storages

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Revision as of 12:30, 13 November 2008 by Dhazin.brox.de (Talk | contribs)

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Use Case: Partitioning both Storages for Backup and Reuse/Recrawling

Changes in XML/Bin-Storage To support partitioning both XML- and Bin- storages must be able to store data to partitions. Thus XML- and Bin- storage APIs should be extended in such way that partition name will be

accepted as an additional parameter to record Id when saving data. With binstorage, binary attachments can have quite a big size, thus if attachment wasn't changed from one partition to

another, it's worth not to copy attachment's data for each partition but store only reference to actual attachment.


There are following options how to pass partition information:

1. Partition information is passed as a record Id property. Listener gets record from the queue and sets partition property to the Id. Blackboard uses parition information in load and commit operations. In this case no signifant changes are required to the blackboard API because partition information is incapsulated into record Id.


2. Partition information is passed separately from record as a JMS property. Listener reads JMS property from the queue and makes it available for other components that will use blackboard (like processing). In this case all methods from blackboard API should be duplicated to handle partition name as a second parameter.


The first option seems to be more useful because it allows to keep partition information directly into the record and thus easily pass and receive it between distributed components.