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https://issues.apache.org/jira/browse/SOLR-13445?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16832436#comment-16832436
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Cao Manh Dat commented on SOLR-13445:
-------------------------------------
I had several private conversations with [~shalinmangar] about how to deal with
this issue, and he helped a lot. Thanks [~shalinmangar].
The attached patch beside implementing mentioned features in the description,
also solving an issue in {{SolrClientNodeStateProvider}} since we always
retrying query metrics from other nodes even it just successfully doing that.
> Preferred replicas on nodes with same system properties as the query master
> ---------------------------------------------------------------------------
>
> Key: SOLR-13445
> URL: https://issues.apache.org/jira/browse/SOLR-13445
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Cao Manh Dat
> Assignee: Cao Manh Dat
> Priority: Major
> Attachments: SOLR-13445.patch
>
>
> Currently, Solr chooses a random replica for each shard to fan out the query
> request. However, this presents a problem when running Solr in multiple
> availability zones.
> If one availability zone fails then it affects all Solr nodes because they
> will try to connect to Solr nodes in the failed availability zone until the
> request times out. This can lead to a build up of threads on each Solr node
> until the node goes out of memory. This results in a cascading failure.
> This issue try to solve this problem by adding
> * another shardPreference param named {{node.sysprop}}, so the query will be
> routed to nodes with same defined system properties as the current one.
> * default shardPreferences on the whole cluster, which will be stored in
> {{/clusterprops.json}}.
> * a cacher for fetching other nodes system properties whenever /live_nodes
> get changed.
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