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https://issues.apache.org/jira/browse/SOLR-2664?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13089690#comment-13089690
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Simon Rosenthal commented on SOLR-2664:
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In working on extending the functionality to SolrJ/CSV/JSON, I've seen some
shortcomings and ambiguities in the initial API I was working on.
here's a clearer approach:
The anticipated use case would be to disable autocommits temporarily during
update processing from a content stream (or from a server.add() in solrJ). So
for /update handlers where a content stream is specified, append the parameter
&deferAutoCommit=true to the URL. Autocommits will be disabled while the
content stream is processed, and automatically re-enabled at the end of
processing (regardless of success or failure). This will also be a recognized
attribute in an <add> element for solr XML processing.
Additionally, no content stream is specified, one can specify the single
operations /update?disableAutoCommit=true and subsequently
/update/enableAutoCommit=true, in the same way as you can specify commit as the
only parameter. However you're on your own if you do the one without the
other....
SolrJ will have new server#disableAutoCommit and server#enableAutocommit
methods, and also add(doc, boolean deferAutoCommit).
> Disable/enable autocommit on the fly
> ------------------------------------
>
> Key: SOLR-2664
> URL: https://issues.apache.org/jira/browse/SOLR-2664
> Project: Solr
> Issue Type: New Feature
> Components: update
> Affects Versions: 4.0
> Reporter: Simon Rosenthal
> Priority: Minor
> Fix For: 4.0
>
> Attachments: SOLR-2664.patch
>
>
> There are occasions when although autocommit is configured, it would be
> desirable to disable it temporarily - for instance when batch adding/updating
> a set of documents which should be committed atomically (e.g. a set of price
> changes).
> The patch adds <disableAutoCommit/> and </enableAutoCommit> commands to
> XMLUpdateHandler, and also adds a disableAutoCommit=true|false attribute to
> the <add> element - this will disable autocommit until the terminating </add>
> at the end of the XML document is reached.
> At present, the autocommit state will not survive a core reload.
> It should be possible to extend this functionality to SolrJ, CSVUpdatehandler
> ( and JSONUpdateHandler ?)
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