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From a.@apache.org
Subject [lucene-solr] branch master updated: SOLR-13159: Add a warning about DNS resolution in SolrCloud clusters.
Date Mon, 16 Sep 2019 16:50:46 GMT
This is an automated email from the ASF dual-hosted git repository.

ab pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/lucene-solr.git


The following commit(s) were added to refs/heads/master by this push:
     new 30aad17  SOLR-13159: Add a warning about DNS resolution in SolrCloud clusters.
30aad17 is described below

commit 30aad175e072ee5c8bb68d8309145819355160bb
Author: Andrzej Bialecki <ab@apache.org>
AuthorDate: Mon Sep 16 18:48:29 2019 +0200

    SOLR-13159: Add a warning about DNS resolution in SolrCloud clusters.
---
 solr/solr-ref-guide/src/how-solrcloud-works.adoc | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/solr/solr-ref-guide/src/how-solrcloud-works.adoc b/solr/solr-ref-guide/src/how-solrcloud-works.adoc
index 7f4db3b..721a696 100644
--- a/solr/solr-ref-guide/src/how-solrcloud-works.adoc
+++ b/solr/solr-ref-guide/src/how-solrcloud-works.adoc
@@ -46,3 +46,9 @@ A SolrCloud cluster consists of some "logical" concepts layered on top of
some "
 * The number of Replicas that each Shard has determines:
 ** The level of redundancy built into the Collection and how fault tolerant the Cluster can
be in the event that some Nodes become unavailable.
 ** The theoretical limit in the number concurrent search requests that can be processed under
heavy load.
+
+WARNING: Make sure the DNS resolution in your cluster is stable, ie.
+for each live host belonging to a Cluster the host name always corresponds to the
+same specific IP and physical node. For example, in clusters deployed on AWS this would
+require setting `preserve_hostname: true` in `/etc/cloud/cloud.cfg`. Changing DNS resolution
+of live nodes may lead to unexpected errors. See SOLR-13159 for more details.
\ No newline at end of file


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