Never mind my previous question, understood what you meant about the impact to
norms after looking at the uses of CreatedMajorVersion in various Similarity
classes. It almost looks re-indexing is the only option here. This will be
quite a big change to embrace for the users of addIndexes(). (
Many thanks Mike.
On 11/10/17, 1:06 PM, "Krishnamurthy, Kannan"
<kannan.krishnamur...@cengage.com> wrote:
Will the norms still be a concern if the 6.1.0 index was upgraded using the
IndexUpgrader? If not would we upgrade first then fake the index creation
version to be 7.0.0 ?
Thanks again.
Kannan
From: Michael McCandless <luc...@mikemccandless.com>
Date: Friday, November 10, 2017 at 6:41 AM
To: Lucene Users <java-user@lucene.apache.org>, "Krishnamurthy, Kannan"
<kannan.krishnamur...@cengage.com>
Subject: Re: Lucene 6.1.0 index upgrade
OK I'm sorry but I think you'll have to re-index; e.g. how norms are
computed and stored in the index has changed, which means even if you could
somehow copy or merge the index over to the new version, the norms would be
incorrect.
Mike McCandless
http://blog.mikemccandless.com
On Thu, Nov 9, 2017 at 6:46 PM, Krishnamurthy, Kannan
<kannan.krishnamur...@cengage.com<mailto:kannan.krishnamur...@cengage.com>>
wrote:
Hi Mike,
It doesn’t work either, it throws “Cannot merge a segment that has been
created with major version 6 into this index which has been created by major
version 7" message. Let me try it after an upgrade as well. Same code below,
@Test
public void mergeUsingCodecReader() throws IOException {
DirectoryReader ir = DirectoryReader.open(lucene610Dir);
SegmentReader air =
(SegmentReader)ir.leaves().get(0).reader();
IndexWriterConfig config = newIndexWriterConfig();
IndexWriter w = new
IndexWriter(newEmptyDirectory("target"), config);
exception.expect(IllegalArgumentException.class);
exception.expectMessage("Cannot merge a segment that has
been created with major version 6 into this index which has been created by
major version 7");
w.addIndexes(air);
w.forceMerge(1);
w.close();
}
Thanks,
Kannan
On 11/9/17, 5:07 PM, "Michael McCandless"
<luc...@mikemccandless.com<mailto:luc...@mikemccandless.com>> wrote:
Maybe try the addIndexes method that takes CodecReader[] instead? It
will
be somewhat slower, since it fully reads and writes the index, but it
should work across major versions?
Mike McCandless
http://blog.mikemccandless.com
On Thu, Nov 9, 2017 at 3:59 PM, Krishnamurthy, Kannan <
kannan.krishnamur...@cengage.com<mailto:kannan.krishnamur...@cengage.com>>
wrote:
> Greetings.
>
>
> We are currently using Lucene 6.1.0, our typical index size is ~
200GB and
> we are planning to move to Lucene 7.0.0.
>
>
> Our daily indexing workflow currently uses IndexWriter.addIndexes()
to add
> an index(this will be on Lucene 7.0.0) to a copy of the of the 200GB
index.
> Further it calls IndexWriter.forceMerge(1) to create a single
segment. The
> addIndexes() now doesn't support different versions of index.
>
> We are facing an issue in upgrading to Lucene 7.0.0 due to this
> limitation. We couldn't afford to do full reindex as there about 50
> different indexes ~ 200GB each.
>
>
> We tried using the LuceneUpgrade tool to upgrade our index to latest
> version, however the IndexCreatedVersionMajor is still
LUCENE_6_1_0.major,
> This is preventing us calling IndexWriter.addIndexes() post upgrade.
>
>
> I am wondering what are our options to upgrade without doing a full
> reindex and to continue to use IndexWriter.addIndexes() post upgrade.
>
> The code snippet below shows the different api calls we make.
>
>
>
> @Test
> public void addIndexWith7SegmentToDirectoryOnUpgradedSegment() throws
> IOException {
> IndexUpgrader upgrader = new IndexUpgrader(lucene610Dir); // lucene
6.1.0
> directory 200 GB
> upgrader.upgrade();
>
> IndexWriter w = new IndexWriter(lucene610Dir, newIndexWriterConfig());
> exception.expect(IllegalArgumentException.class);
> exception.expectMessage(
> CoreMatchers.containsString("Cannot use addIndexes(Directory) with
> indexes that have been created by a different Lucene version"));
> w.addIndexes(lucene700Dir); // lucene 7.0.0 daily index
> w.forceMerge(1);
> w.close();
> }
>
> Let me know if you need more details.
>
>
> Many thanks
>
> Kannan.
>
>
