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https://issues.apache.org/jira/browse/SOLR-14923?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17226632#comment-17226632
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Thomas Wöckinger commented on SOLR-14923:
-----------------------------------------

Some comments about:
{quote}When there isn't an updateLog (it's technically optional), then there 
may be a bug because the reader probably needs to be re-opened still.
{quote}
If there is no update log configured, atomic updates cannot be used, you get an 
exception in this case.

[~dsmiley] ,[~markrmiller] I will have a look at RTG and how it interacts with 
'Atomic Update', obviously it is currently required, because when removing the 
refresh part from DistributedUpdateProcessor there are failing three unit tests 
as mentioned in the comments before.

 

 

> 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: master (9.0), 8.3, 8.4, 8.5, 8.6
>            Reporter: Thomas Wöckinger
>            Priority: Critical
>              Labels: performance
>
> 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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