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From da...@apache.org
Subject lucene-solr:branch_7x: SOLR-12051: Update upgrade notes
Date Fri, 09 Mar 2018 12:36:34 GMT
Repository: lucene-solr
Updated Branches:
  refs/heads/branch_7x 4d64e7bcb -> 3b6649faa


SOLR-12051: Update upgrade notes


Project: http://git-wip-us.apache.org/repos/asf/lucene-solr/repo
Commit: http://git-wip-us.apache.org/repos/asf/lucene-solr/commit/3b6649fa
Tree: http://git-wip-us.apache.org/repos/asf/lucene-solr/tree/3b6649fa
Diff: http://git-wip-us.apache.org/repos/asf/lucene-solr/diff/3b6649fa

Branch: refs/heads/branch_7x
Commit: 3b6649faab1ed45cfd2a5507e042262691f6ea25
Parents: 4d64e7b
Author: Cao Manh Dat <datcm@apache.org>
Authored: Fri Mar 9 19:35:26 2018 +0700
Committer: Cao Manh Dat <datcm@apache.org>
Committed: Fri Mar 9 19:36:23 2018 +0700

----------------------------------------------------------------------
 solr/CHANGES.txt | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/3b6649fa/solr/CHANGES.txt
----------------------------------------------------------------------
diff --git a/solr/CHANGES.txt b/solr/CHANGES.txt
index 79652d3..b33c30f 100644
--- a/solr/CHANGES.txt
+++ b/solr/CHANGES.txt
@@ -58,11 +58,13 @@ Upgrade Notes
 * LUCENE-8161: If you are using the spatial JTS library with Solr, you must upgrade to 1.15.0.
 This new version
   of JTS is now dual-licensed to include a BSD style license.
 
-* SOLR-12051: By using term value introduced in SOLR-11702, a replica will know that it is
in-sync with the leader or not.  
-  If all the replicas who participate in the election are out-of-sync with previous leader,
the election will hang for 
-  leaderVoteWait before allowing out-of-sync with previous leader replicas become leader.
Note that the new leader 
-  still needs to contains more updates than any other active replicas in the same shard.
Therefore by increasing 
-  leaderVoteWait will increase the consistency (over availability) of the system. 
+* SOLR-12051: A new mechanism is introduced in SOLR-11702 to maintain consistency in SolrCloud
between leader and replicas.
+  This mechanism lets Solr know whether a replica is in-sync with the leader or not, even
when the leader is not live.
+  If all the replicas who participate in the leader election are out-of-sync with previous
leader, the election will
+  pause until a timeout (named "leaderVoteWait") before allowing an out-of-sync replica to
become leader. Note that the
+  new leader still needs to contains more updates than any other active replicas in the same
shard. Therefore by
+  increasing leaderVoteWait will increase the consistency (over availability) of the system.
The default value of
+  leaderVoteWait is 180,000 ms (3 minutes) and it can be adjusted in the "solrcloud" section
of the solr.xml
 
 * SOLR-11957: The default Solr log file size and number of backups is raised to 32MB and
10 respectively
 


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