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https://issues.apache.org/jira/browse/LUCENE-9191?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17027923#comment-17027923
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Kevin Risden commented on LUCENE-9191:
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So I don't know a ton about LineFileDocs - or the reason trying to seek inside
a gzip. However just reading this it seems like it might be possible to read it
all upfront?
Wouldn't it be possible to read the whole gzip into a byte array or something
like that? It would use more memory, but it would be quick - wouldn't have to
seek upfront. You would have to do some checking to make sure you don't read a
file that is TOO big (could fall back to slow mode for a big file).
If I understand correctly though this is a small file and so reading it into
memory would make it then quick to seek through.
If I am completely off my rocker here feel free to just ignore me.
> Fix linefiledocs compression or replace in tests
> ------------------------------------------------
>
> Key: LUCENE-9191
> URL: https://issues.apache.org/jira/browse/LUCENE-9191
> Project: Lucene - Core
> Issue Type: Task
> Reporter: Robert Muir
> Priority: Major
>
> LineFileDocs(random) is very slow, even to open. It does a very slow "random
> skip" through a gzip compressed file.
> For the analyzers tests, in LUCENE-9186 I simply removed its usage, since
> TestUtil.randomAnalysisString is superior, and fast. But we should address
> other tests using it, since LineFileDocs(random) is slow!
> I think it is also the case that every lucene test has probably tested every
> LineFileDocs line many times now, whereas randomAnalysisString will invent
> new ones.
> Alternatively, we could "fix" LineFileDocs(random), e.g. special compression
> options (in blocks)... deflate supports such stuff. But it would make it even
> hairier than it is now.
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