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Posted to dev@lucene.apache.org by "Erick Erickson (JIRA)" <ji...@apache.org> on 2016/11/18 14:53:59 UTC
[jira] [Resolved] (SOLR-9296) Examine SortingResponseWriter with an
eye towards removing extra object creation
[ https://issues.apache.org/jira/browse/SOLR-9296?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Erick Erickson resolved SOLR-9296.
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Resolution: Invalid
This was an exploratory bit of hacking to see whether there was unnecessary object creation. Other approaches (see the linked JIRAs and Noble's comments) are more general and address this in a more elegant way so closing.
> Examine SortingResponseWriter with an eye towards removing extra object creation
> --------------------------------------------------------------------------------
>
> Key: SOLR-9296
> URL: https://issues.apache.org/jira/browse/SOLR-9296
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Affects Versions: 6.2, master (7.0)
> Reporter: Erick Erickson
> Assignee: Erick Erickson
> Attachments: SOLR-9296.patch
>
>
> Assigning to myself just to keep from losing track it. Anyone who wants to take it, please feel free!
> While looking at SOLR-9166 I noticed that SortingResponseWriter does a toString for each field it writes out. At a _very_ preliminary examination it seems like we create a lot of String objects that need to be GC'd. Could we reduce this by using some kind of CharsRef/ByteBuffer/Whatever?
> I've only looked at this briefly, not quite sure what the gotchas are but throwing it out for discussion.
> Some initial thoughts:
> 1> for the fixed types (numerics, dates, booleans) there's a strict upper limit on the size of each value so we can allocate something up-front.
> 2> for string fields, we already get a chars ref so just pass that through?
> 3> must make sure that whatever does the actual writing transfers all the bytes before returning.
> I'm sure I won't get to this for a week or perhaps more, so grab it if you have the bandwidth.
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