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https://issues.apache.org/jira/browse/SOLR-912?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12786348#action_12786348
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Noble Paul commented on SOLR-912:
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bq.The performance numbers in here say a different story
I'm not referring to perf numbers here . It is memory efficiency.
bq. As regarding Entry Objects being a memory hog - do we have some stats to
back it up.
We don't need stats for everything. we should know about how VM holds objects .
Let me illustrate with a case of consider 5 key->values on a 32 bit m/c
NamedList(Backed by arraylist)
one Object [] + array size= 4 + 5 * 2*4 (bytes) = 44 bytes + the overhead of
ArrayList
ModernNamedList
one Object[] + 5 entry objects (each has 2 references of 4+4 bytes)+ array size
() = 4 + 5*2*4 + 5*4 = 64 bytes+ the overhead of ArrayList
Add to this the overhead of GC'ing 5 entry objects
> org.apache.solr.common.util.NamedList - Typesafe efficient variant -
> ModernNamedList introduced - implementing the same API as NamedList
> ----------------------------------------------------------------------------------------------------------------------------------------
>
> Key: SOLR-912
> URL: https://issues.apache.org/jira/browse/SOLR-912
> Project: Solr
> Issue Type: Improvement
> Components: search
> Environment: Tomcat 6, JRE 6, Solr 1.3+ nightlies
> Reporter: Kay Kay
> Priority: Minor
> Attachments: NLProfile.java, SOLR-912.patch, SOLR-912.patch
>
> Original Estimate: 72h
> Remaining Estimate: 72h
>
> The implementation of NamedList - while being fast - is not necessarily
> type-safe. I have implemented an additional implementation of the same -
> ModernNamedList (a type-safe variation providing the same interface as
> NamedList) - while preserving the semantics in terms of ordering of elements
> and allowing null elements for key and values (keys are always Strings ,
> while values correspond to generics ).
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