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https://issues.apache.org/jira/browse/LUCENE-6722?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14659658#comment-14659658
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Uwe Schindler commented on LUCENE-6722:
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Hi,
we should not move the 5.x branch to Java 8 a this point. The differences
between trunk and 5.x are not so big, so we can instead just switch to Lucene 6
aka Trunk. Backporting all the Java 8 changes back to branch5x is a lot of
work, because you have to pick lots of commits and backport them again.
I would like to prepare Lucene trunk to make it "releaseable" (e.g., fix the
Stored/IndexDocument issues with docvalues) and then release 6.0 during the
next year.
Most merge conflicts I see between trunk and 5.x are more related to
Index/StorableDocument. The differences in Java code are minimal (we have some
lambdas in trunk already, but nobody really did a "big rewrite" of that code).
I backported some stuff that used Java 8 code in trunk, but that was quite
simple.
So my vote:
-1 to move branch_5x to Java 8
+1 to work on releasing trunk as Lucene 6
> Java 8 as the minimum supported JVM version for branch_5x
> ---------------------------------------------------------
>
> Key: LUCENE-6722
> URL: https://issues.apache.org/jira/browse/LUCENE-6722
> Project: Lucene - Core
> Issue Type: Wish
> Reporter: Shalin Shekhar Mangar
> Priority: Blocker
> Fix For: 5.4
>
>
> Require Java 8 as the minimum supported JVM version for branch_5x.
> # Java 7 is already EOL'ed
> # Trunk is already at Java8
> # Important Solr components such as Jetty 9.3.x already require Java 8
> # Nashorn Javascript engine available in Java 8 is just so much faster and we
> may see more usage of JS inside Solr (SOLR-7576 etc.)
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