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https://issues.apache.org/jira/browse/LUCENE-9191?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17027912#comment-17027912
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Michael McCandless commented on LUCENE-9191:
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Thanks [~rcmuir], it sounds like we could pre-split into N chunks, compress
them separately and then concatenate that, and record the resulting seek points
(in compressed bytes space) maybe in a simple {{.txt}} file side-by-side with
the .gz file? Or maybe somehow the Java gzip APIs could read metadata up
front, and determine the (fast) skip points dynamically?
Thanks to the chunked {{.gz}} encoding, the resulting file should be a valid
{{.gz}} file too.
> 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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