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https://issues.apache.org/jira/browse/SOLR-13445?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16834405#comment-16834405
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Shalin Shekhar Mangar commented on SOLR-13445:
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Thanks Dat. A few comments:
# Minor nit: Rename HttpShardHandlerFactory#sameMetric to hasSameMetric
# Can you do an exponential backoff in NodesSysPropsCacher#fetchRemoteProps?
# The RoutingToNodesWithPropertiesTest needs a better check than comparing
shardAddress. The reason is that shardAddress is set by the GET_TOP_IDS phase
but not by other phases such as GET_FIELDS. Use TrackingShardHandlerFactory
instead.
# I agree with Andrzej that the fix to SolrClientNodeStateProvider should go to
a separate issue so that it can be backported to 7_7 if needed.
> 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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