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From "Andrzej Bialecki (JIRA)" <>
Subject [jira] [Commented] (LUCENE-5914) More options for stored fields compression
Date Mon, 01 Sep 2014 09:27:21 GMT


Andrzej Bialecki  commented on LUCENE-5914:

bq. Do you have pointers to emails/irc logs describing such issues?
I've seen this issue on AWS small instances, where CPU "steal time" and not I/O can easily
become the limiting factor.

> More options for stored fields compression
> ------------------------------------------
>                 Key: LUCENE-5914
>                 URL:
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Adrien Grand
>            Assignee: Adrien Grand
>             Fix For: 4.11
>         Attachments: LUCENE-5914.patch
> Since we added codec-level compression in Lucene 4.1 I think I got about the same amount
of users complaining that compression was too aggressive and that compression was too light.
> I think it is due to the fact that we have users that are doing very different things
with Lucene. For example if you have a small index that fits in the filesystem cache (or is
close to), then you might never pay for actual disk seeks and in such a case the fact that
the current stored fields format needs to over-decompress data can sensibly slow search down
on cheap queries.
> On the other hand, it is more and more common to use Lucene for things like log analytics,
and in that case you have huge amounts of data for which you don't care much about stored
fields performance. However it is very frustrating to notice that the data that you store
takes several times less space when you gzip it compared to your index although Lucene claims
to compress stored fields.
> For that reason, I think it would be nice to have some kind of options that would allow
to trade speed for compression in the default codec.

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