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https://jira.duraspace.org/browse/DS-739?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17996#action_17996
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Graham Triggs commented on DS-739:
----------------------------------
The various tasks - media-filter, indexing, itemimport - put DSIndexer into
batchprocessingmode in all cases. It's just a case of what you have set the
dspace.cfg property to in order to control the size of the batch (default is
20).
For the delayed update for web applications, this defaults to being disabled,
but can be enabled by adding the dspace.cfg property.
> Improve performance of Lucene indexing
> --------------------------------------
>
> Key: DS-739
> URL: https://jira.duraspace.org/browse/DS-739
> Project: DSpace
> Issue Type: Improvement
> Reporter: Graham Triggs
> Assignee: Graham Triggs
> Fix For: 1.7.0
>
>
> Adds a batch processing mode for Lucene indexes.
> Can be controlled by calling DSIndexer.setBatchProcessingMode(boolean).
> NB: If you set batch processing mode to true, ensure that you set it to
> 'false' at the end of the batch to flush any unwritten documents.
> The size of the batch can be controlled by setting a numeric value in
> dspace.cfg for the property: search.batch.documents
> By default, the size of the batch is 20 documents.
> Additionally, there is the possibility to create a 'delayed index flusher'.
> If a web application pushes multiple search requests (ie. a barrage or sword
> deposits, or multiple quick edits in the ui), then this will combine them
> into a single index update (up to the limit of the batch defined above).
> To use the delayed update, set the property 'search.index.delay' in
> dspace.cfg to the number of milliseconds to wait for an update. eg.
> search.index.delay = 5000
> will hold a Lucene update in a queue for up to 5 seconds. After 5 seconds -
> or the batch limit above is reached - all waiting updates will be written to
> the Lucene index.
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