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Posted to issues@lucene.apache.org by "David Smiley (Jira)" <ji...@apache.org> on 2021/01/08 05:14:01 UTC
[jira] [Resolved] (SOLR-14923) Indexing performance is unacceptable
when child documents are involved
[ https://issues.apache.org/jira/browse/SOLR-14923?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
David Smiley resolved SOLR-14923.
---------------------------------
Fix Version/s: 8.8
Assignee: David Smiley
Resolution: Fixed
> Indexing performance is unacceptable when child documents are involved
> ----------------------------------------------------------------------
>
> Key: SOLR-14923
> URL: https://issues.apache.org/jira/browse/SOLR-14923
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: update, UpdateRequestProcessors
> Affects Versions: 8.3, 8.4, 8.5, 8.6, 8.7, master (9.0)
> Reporter: Thomas Wöckinger
> Assignee: David Smiley
> Priority: Critical
> Labels: performance, pull-request-available
> Fix For: 8.8
>
> Time Spent: 2h 50m
> Remaining Estimate: 0h
>
> Parallel indexing does not make sense at moment when child documents are used.
> The org.apache.solr.update.processor.DistributedUpdateProcessor checks at the end of the method doVersionAdd if Ulog caches should be refreshed.
> This check will return true if any child document is included in the AddUpdateCommand.
> If so ulog.openRealtimeSearcher(); is called, this call is very expensive, and executed in a synchronized block of the UpdateLog instance, therefore all other operations on the UpdateLog are blocked too.
> Because every important UpdateLog method (add, delete, ...) is done using a synchronized block almost each operation is blocked.
> This reduces multi threaded index update to a single thread behavior.
> The described behavior is not depending on any option of the UpdateRequest, so it does not make any difference if 'waitFlush', 'waitSearcher' or 'softCommit' is true or false.
> The described behavior makes the usage of ChildDocuments useless, because the performance is unacceptable.
>
>
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