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From "Chetan Mehrotra (JIRA)" <j...@apache.org>
Subject [jira] [Created] (OAK-5925) CLONE - Limit the number of times a LuceneResultRow based iterator get reset
Date Tue, 14 Mar 2017 06:17:41 GMT
Chetan Mehrotra created OAK-5925:
------------------------------------

             Summary: CLONE - Limit the number of times a LuceneResultRow based iterator get
reset
                 Key: OAK-5925
                 URL: https://issues.apache.org/jira/browse/OAK-5925
             Project: Jackrabbit Oak
          Issue Type: Improvement
          Components: lucene
            Reporter: Chetan Mehrotra
            Assignee: Thomas Mueller
            Priority: Minor
             Fix For: 1.5.15, 1.6.0


With changes done in OAK-2569 it can happen that the cursor returned by {{LucenePropertyIndex}}
gets reset multiple times as the index gets updated for a long running query

{noformat}
11697: 26.02.2016 16:12:16.296 *DEBUG* [qtp567069427-14229] org.apache.jackrabbit.oak.plugins.index.lucene.LuceneIndex
... took 3690 ms
47507: 26.02.2016 16:13:26.744 *DEBUG* [qtp567069427-14229] org.apache.jackrabbit.oak.plugins.index.lucene.LuceneIndex
loading the next 12800 entries for query :fulltext:foo
47513: 26.02.2016 16:13:30.486 *DEBUG* [qtp567069427-14229] org.apache.jackrabbit.oak.plugins.index.lucene.LuceneIndex
... took 3742 ms
55832: 26.02.2016 16:15:43.693 *DEBUG* [qtp567069427-14229] org.apache.jackrabbit.oak.plugins.index.lucene.LuceneIndex
loading the next 25600 entries for query :fulltext:foo
55835: 26.02.2016 16:15:51.261 *DEBUG* [qtp567069427-14229] org.apache.jackrabbit.oak.plugins.index.lucene.LuceneIndex
... took 7568 ms
59383: 26.02.2016 16:21:12.355 *DEBUG* [qtp567069427-14229] org.apache.jackrabbit.oak.plugins.index.lucene.LuceneIndex
Change in index version detected 4186634 => 4186631. Query would be performed without offset
59384: 26.02.2016 16:21:12.355 *DEBUG* [qtp567069427-14229] org.apache.jackrabbit.oak.plugins.index.lucene.LuceneIndex
loading the first 51200 entries for query :fulltext:foo
{noformat}

If the index continuously gets updated then such a query would never finish and would consume
system resources.  For such case we should enforce some limit



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