[lucene-solr] branch branch_8x updated: SOLR-13159: Add a warning about DNS resolution in SolrCloud clusters.

[ab...@apache.org]

This is an automated email from the ASF dual-hosted git repository.

ab pushed a commit to branch branch_8x
in repository https://gitbox.apache.org/repos/asf/lucene-solr.git


The following commit(s) were added to refs/heads/branch_8x by this push:
     new d3671fd  SOLR-13159: Add a warning about DNS resolution in SolrCloud clusters.
d3671fd is described below

commit d3671fd0d2bfda4ded0b905be5955b5ccfafff79
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