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https://issues.apache.org/jira/browse/LUCENE-5113?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13708777#comment-13708777
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Robert Muir commented on LUCENE-5113:
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+1, the little 8KB pending buffers can really add up, e.g. if you have an
OrdinalMap over 25 segments (with zero terms!), thats 200KB just for pending[]s.
We could try to solve it in another way if it makes appending* complicated or
would hurt performance, e.g. maybe this map could use some other packed ints
api.
There are a few other places using this buffer though: I think fieldcache term
addresses, indexwriter consumers, not sure what else.
> Allow for packing the pending values of our AppendingLongBuffers
> ----------------------------------------------------------------
>
> Key: LUCENE-5113
> URL: https://issues.apache.org/jira/browse/LUCENE-5113
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
>
> When working with small arrays, the pending values might require substantial
> space. So we could allow for packing the pending values in order to save
> space, the drawback being that this operation will make the buffer read-only.
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