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https://issues.apache.org/jira/browse/LUCENE-4515?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13487830#comment-13487830
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Michael McCandless commented on LUCENE-4515:
--------------------------------------------
Cool!: you used the same slice idea that we use to hold postings in
RAM in shared byte[]s, but with int[]s instead. This should be a huge
reduction on GC load for MemoryIndex.
I agree that DocFieldProcessor.docBoost is unused...
synchronizedAllocator looks unused? I guess you added that after
removing all sync from RecyclingByteBlockAllocator ... but I think we
can just add synchronizedAllocator back later if/when we need it?
Separately can you call out that RecyclingByteBlockAllocator is not
thread safe in its javadocs?
{quote}
int[] start; // nocommit maybe we can safe the end array and just check freq -
need to change the SliceReader for this
{quote}
I think you need the start ... because if you used more than one slice
you won't know how to read "backwards" to get to the starting slice?
{quote}
intBlockPool = new IntBlockPool(); // nocommit expose allocator and impl a
recycling one
{quote}
If we do that we have to make sure that allocator clears each int[]
before returning it, in getIntBlock().
The added MemoryIndex.reset method is sort of ... spooky? Like, do we
really need/want to reuse a MemoryIndex? (I guess this is because we
added passing in an allocator to the ctor ... so you want the byte[]'s
returned to it ... but that also makes me nervous: should we really
pass in an external allocator...?).
> Make MemoryIndex more memory efficient
> --------------------------------------
>
> Key: LUCENE-4515
> URL: https://issues.apache.org/jira/browse/LUCENE-4515
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/other
> Affects Versions: 4.0, 4.1, 5.0
> Reporter: Simon Willnauer
> Fix For: 4.1, 5.0
>
> Attachments: LUCENE-4515.patch
>
>
> Currently MemoryIndex uses BytesRef objects to represent terms and holds an
> int[] per term per field to represent postings. For highlighting this creates
> a ton of objects for each search that 1. need to be GCed and 2. can't be
> reused.
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