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From Apache Wiki <>
Subject [Solr Wiki] Update of "ReleaseNote80" by datcm
Date Fri, 03 May 2019 14:55:31 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Solr Wiki" for change notification.

The "ReleaseNote80" page has been changed by datcm:

  == Solr 8.0.0 Release Highlights ==
- * Solr now uses HTTP/2 for inter-node communication
+ * Solr is switching from Apache HttpClient to Jetty Client for adding HTTP/2 support. Most
frequent inter-communication between nodes like indexing and query are now sent in HTTP/2.
HTTP/1.1 practically allows only one outstanding request per TCP connection this means that
for sending multiple requests at the same time multiple TCP connections must be established.
This leads to waste of resources on both-sides and long GC-pause. Solr 8 with HTTP/2 support
overcomes that problem by allowing multiple requests can be sent in parallel using a same
TCP connection.
  * Nested documents (AKA child documents or block join) is significantly improved.  Most
improvements come from storing and leveraging more information about the relationships in
the index, like the named relationship between a child and its parent.  This information is
used by the [child] doc transformer to return children in nested form instead of flat.  There
is plenty more that can be done with this in the future.  Another key improvement is that
nested documents can be deleted or replaced in a natural way without orphaning child documents;
although care is still needed with delete-by-query.

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