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https://issues.apache.org/jira/browse/SOLR-1707?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12797713#action_12797713
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Yonik Seeley commented on SOLR-1707:
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OK, I whipped up a quick test with String keys, many small maps (anywhere from
1 to 20 keys per map). Java6 -server 64 bit, Win7_x64
Size:
Collections.unmodifiableMap: 7.4% bigger than HashMap
google immutable map: 22.4% bigger than HashMap
Speed:
Collections.unmodifiableMap: 4.2% slower than HashMap
google immutable map: 26.0% slower than HashMap
For best space and speed, looks like we should stick with straight HashMap.
> Use google collections immutable collections instead of
> Collections.unmodifiable**
> ----------------------------------------------------------------------------------
>
> Key: SOLR-1707
> URL: https://issues.apache.org/jira/browse/SOLR-1707
> Project: Solr
> Issue Type: Improvement
> Reporter: Noble Paul
> Assignee: Noble Paul
> Fix For: 1.5
>
> Attachments: SOLR-1707.patch
>
>
> google collections offer true immutability and more memory efficiency
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