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SOLR-12051: Update upgrade notes

This commit is contained in:
Cao Manh Dat 2018-03-09 19:35:26 +07:00
parent 423a8cf69c
commit 4c2703e8be
1 changed files with 7 additions and 5 deletions
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solr/CHANGES.txt
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@ -78,11 +78,13 @@ 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