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From "Tommaso Teofili (JIRA)" <j...@apache.org>
Subject [jira] [Created] (OAK-3129) SolrQueryIndex making too many Solr requests per jCR query
Date Tue, 21 Jul 2015 13:46:04 GMT
Tommaso Teofili created OAK-3129:

             Summary: SolrQueryIndex making too many Solr requests per jCR query
                 Key: OAK-3129
                 URL: https://issues.apache.org/jira/browse/OAK-3129
             Project: Jackrabbit Oak
          Issue Type: Improvement
          Components: solr
    Affects Versions: 1.0.17, 1.3.2, 1.2.2
            Reporter: Tommaso Teofili
            Assignee: Tommaso Teofili
             Fix For: 1.2.4, 1.3.3, 1.0.18

{{SolrQueryIndex}} and {{FilterQueryParser}} use the {{OakSolrConfiguration#getRows}} setting
in order to set the number of documents that should be fetched in batches while iterating
the {{Cursor}} resulting from a certain query.
While this is an optimization that avoids loading all the results in memory in cases where
only e.g. the first 10 results of the {{Cursor}} are visited, it tends to perform really
bad when resultsets' cardinality is 10 times or more bigger than the 'rows' setting, because
for each JCR query, 10 or more Solr queries are performed (with the additional network, Solr
calls, etc. latencies).

In order to avoid that we could make use of the 'rows' setting in order to perform the first
request to Solr and then adapt the subsequent paged requests (controlled by start and rows
Solr HTTP parameters) to be run against the rest of the resultset in no more than 2 Solr queries.
This can be done by looking at the _numFound_ value from Solr's response header and set the
start/rows parameters accordingly.

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