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From: "Uwe Schindler" <uwe@thetaphi.de>
To: <general@lucene.apache.org>
References: <1497494135068-4340644.post@n3.nabble.com>
In-Reply-To: <1497494135068-4340644.post@n3.nabble.com>
Subject: RE: Would docvalues be loaded into jvm?
Date: Thu, 15 Jun 2017 08:39:09 +0200
Message-ID: <000001d2e5a2$180c5610$48250230$@thetaphi.de>
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archived-at: Thu, 15 Jun 2017 06:39:21 -0000

Hi

It works directly off  the mmapped files. It is not fully loaded into =
heap, only some small control structures are allocated on heap. During =
sorting the TopDocsCollector uses the memory mapped structures to =
uncompress and lookup the sort values.

Uwe

-----
Uwe Schindler
Achterdiek 19, D-28357 Bremen
http://www.thetaphi.de
eMail: uwe@thetaphi.de

> -----Original Message-----
> From: wangqinghuan [mailto:1095193290@qq.com]
> Sent: Thursday, June 15, 2017 4:36 AM
> To: general@lucene.apache.org
> Subject: Would docvalues be loaded into jvm?
>=20
> hi
> I know that data is written into disk with the style of column-store =
if I
> enable doc-values for certain field.
> But I don't understand why sorting with docvalues doesn't increase the =
load
> of jvm. whatever sorting algorithm , data would be loaded into  jvm to =
sort.
> This should be a high load for jvm when I sort all index  , but  no =
change
> for jvm in fact.  How does lucene sort with docvalues ? Can sort =
algorithm
> work directly based on the file (Mmap) ?
>=20
>=20
>=20
> --
> View this message in context: =
http://lucene.472066.n3.nabble.com/Would-
> docvalues-be-loaded-into-jvm-tp4340644.html
> Sent from the Lucene - General mailing list archive at Nabble.com.