Cao Manh Dat created SOLR-13445:
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Summary: 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
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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