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https://issues.apache.org/jira/browse/SOLR-12959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16683188#comment-16683188
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Noble Paul commented on SOLR-12959:
-----------------------------------
Perf runs runs using the various Map like containers
* NamedList
* HashMap
* LinkedHashMap
* FastOrderedMap : This is a new container backed by a NamedList but lookups
are done using a lazily created <int,int> map. The map is constructed only if a
key based lookup is performed
{code}
TOTAL_KEYS : 1000
TOTAL_OBJS : 10000
TOTAL_LOOKUPS : 1000000
---------------------------------------
ram usage KB FASTORDEREDMAP: 108969
time taken FOM: 222
---------------------------------------
LinkedHashMap ram usage KB: 471371
time taken LINKEDMAP: 210
---------------------------------------
HASHMAP ram usage KB: 393179
time taken HASHMAP: 207
---------------------------------------
ram usage KB NL: 109039
time taken NamedList: 3022
=====================================================
TOTAL_KEYS : 100
TOTAL_OBJS : 10000
TOTAL_LOOKUPS : 1000000
---------------------------------------
ram usage KB NL: 9844
time taken NamedList: 493
---------------------------------------
LinkedHashMap ram usage KB: 49809
time taken LINKEDMAP: 187
---------------------------------------
HASHMAP ram usage KB: 41929
time taken HASHMAP: 185
---------------------------------------
ram usage KB FASTORDEREDMAP: 10368
time taken FOM: 205
{code}
> Deprecate solrj SimpleOrderedMap
> --------------------------------
>
> Key: SOLR-12959
> URL: https://issues.apache.org/jira/browse/SOLR-12959
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: SolrJ
> Reporter: Noble Paul
> Priority: Minor
>
> There is no difference between a NamedList and a SumpleOrderedMap. It
> doesn't help to have both of them when they are doing exactly free same things
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