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From Shad Storhaug <>
Subject RE: Next release due
Date Sun, 22 Mar 2020 12:44:12 GMT
Hi Michael,

To help us close some small issues, doing a search through the entire solution to see TODO
items specific to Lucene.NET using a "Edit > Find and Replace > Find in files" in Visual
Studio can be done to find issues that are still open (many of which are not in JIRA). To
find them, search for the string "LUCENENET TODO|LUCENE TO-DO" using the Regex option.

To be more specific, here are a couple of examples:

1. Replace all private/internal nested IComparer<T> implementations (usually including
the word "Anonymous" in the name) with the Comparer.Create() method (see:
This will eliminate a lot of unnecessary classes and make the code correspond to Java better,
which uses anonymous classes to achieve similar code inlining. If you are unsure if one needs
to be converted to inline code rather than a concrete class, check the Java implementation
to see if it is inline (

2. Change overloads of OpenStringBuilder.Append(charsequence, start, end) to OpenStringBuilder.Append(charsequence,
startIndex, charCount) to match the conventions in .NET (
In Java, the convention is to use start index and end index to select text in a string, but
in .NET, the corresponding convention is to use start index and length (count).

Once you make the changes and have tested them thoroughly, just open a pull request on GitHub
for review:

There are several other ways to help including answering questions on our user mailing list
and on StackOverflow, blogging about Lucene.NET, and helping us to find bugs and bottlenecks.
See for
some inspiration. However, closing remaining issues in JIRA and in ICU4N are what will move
us closer to release.

Shad Storhaug
Project Chairperson - Apache Lucene.NET

-----Original Message-----
From: Michael Condillac <> 
Sent: Sunday, March 22, 2020 4:50 PM
Subject: RE: Next release due

Hi Shad,

Sounds like good progress has been made up to now. I do have some additional capacity right
now so perhaps I can be of some help. I did pull the source code already but perhaps you could
give me some pointers on where the best place to start might be?

If you think there are some small tasks that I could meaningfully help with I'd be happy to
take a look. 


-----Original Message-----
From: Shad Storhaug <>
Sent: Sunday, March 22, 2020 3:22 PM
Subject: RE: Next release due


Thank you for your inquiry.

Lucene.NET is open source and all of its contributors are volunteers that work on their own
schedule, so it is difficult to give you an exact timeframe that it will be released in. However,
we have recently been keeping an updated list of remaining tasks and time estimates, which
indicate we are roughly 700-800 hours away from completion, with about 1/3 of that time being
the completion of the ICU4N project
( (our biggest dependency). So far, there have been roughly
4600 hours contributed toward the release, so we are almost there. The remaining tasks today
are roughly 60% of what we had in August 2019.

All of the high priority items have been put into JIRA
( and on GitHub issues in the case of ICU4N
e%3Abeta). Anything marked up-for-grabs is something that anyone can start to work on if they
wish to contribute. Let me know if you need any suggestions for small tasks that can be done
in a small amount of time to get familiar with the project and the Apache process. 

At our current rate it may be well into next year (2021) for a stable release, but we could
shorten that timeframe significantly (6 months or
less) if more people were willing to help out with getting the remaining tasks done. After
the stable release of Lucene.NET 4.8.0, we also have a plan to upgrade from Lucene 4.8.0 to
Lucene 8.x in around 1700 hours by only porting over the changes (delta) between the releases.

But the bottom line is, we need more contributions to get over the finish line in a reasonable
timeframe. If you could contribute some of your time, it would mean a lot to the thousands
of users that depend on Lucene.NET.

Shad Storhaug
Project Chairperson - Apache Lucene.NET

-----Original Message-----
From: Michael Condillac <> On Behalf Of
Sent: Sunday, March 22, 2020 1:43 PM
Subject: Next release due

Hi all,

Hope you are all safe in this turbulent time. One of the silver linings, if I can use that
term lightly for such a serious situation, in the whole affair is the opportunity it offers
to switch from urgent commercial work to projects on the back burner.

One of my side projects requires a search engine implementation and I had briefly looked at
Lucene.Net a while back. Now I see the latest stable release (3.0.3) is from 2012 and 4.8
is in beta. 

I see that significant work has already been completed and am confident I can get my idea
to POC stage - are you close to a final release? I wasn't able to find any indicative dates.

Thanks for any help - I realise your priorities may be in other areas at this time.


Ps. Apologies, I have resent this as I hadn't added a new more relevant subject line.

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