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https://issues.apache.org/jira/browse/SOLR-7467?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14511750#comment-14511750
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Hoss Man commented on SOLR-7467:
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Beyond some basic bug fixes, 3.1 includes 2 notable changes...
* new static {{TDigest.createDigest()}} factory method to create "a TreeDigest
of whichever type is the currently recommended type"
** looked into switching to this to minimize code changes needed in Solr as the
library itself improves in future versions, but this only helps for creating
empty instances -- when attempting to merge the byte[] data from multiple
shards, you still have to know the concrete TDigest implementation used to know
which "fromBytes" method to call -- so it's not really useul to us yet (i filed
https://github.com/tdunning/t-digest/issues/52)
* new MergingDigest implementation
** this looks interesting and might be worth switching to in the future, but
based on the comments in the class level javadocs about more testing needed,
and since the {{TDigest.createDigest()}} method mentioned above still uses
{{AVLTreeDigest}} we should probably to leave to just leave our code alone and
keep using {{AVLTreeDigest}} in Solr for now.
> upgrade tdigest (3.1)
> ---------------------
>
> Key: SOLR-7467
> URL: https://issues.apache.org/jira/browse/SOLR-7467
> Project: Solr
> Issue Type: Task
> Reporter: Hoss Man
> Assignee: Hoss Man
>
> The jar is a drop in replacement, just need a trivial change to
> ivy-versions.properties and replacing the jar's sha1 file
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