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https://issues.apache.org/jira/browse/SOLR-14537?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ishan Chattopadhyaya reopened SOLR-14537:
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> Improve performance of ExportWriter
> -----------------------------------
>
> Key: SOLR-14537
> URL: https://issues.apache.org/jira/browse/SOLR-14537
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Export Writer
> Reporter: Andrzej Bialecki
> Assignee: Andrzej Bialecki
> Priority: Major
> Fix For: 8.7
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> Retrieving, sorting and writing out documents in {{ExportWriter}} are three
> aspects of the /export handler that can be further optimized.
> SOLR-14470 introduced some level of caching in {{StringValue}}. Further
> options for caching and speedups should be explored.
> Currently the sort/retrieve and write operations are done sequentially, but
> they could be parallelized, considering that they block on different channels
> - the first is index reading & CPU bound, the other is bound by the receiving
> end because it uses blocking IO. The sorting and retrieving of values could
> be done in parallel with the operation of writing out the current batch of
> results.
> One possible approach here would be to use "double buffering" where one
> buffered batch that is ready (already sorted and retrieved) is being written
> out, while the other batch is being prepared in a background thread, and when
> both are done the buffers are swapped. This wouldn't complicate the current
> code too much but it should instantly give up to 2x higher throughput.
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