Gabriel Jimenez created IGNITE-11335:
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Summary: Data Center Affinity on Reads for Performance Increase
Key: IGNITE-11335
URL: https://issues.apache.org/jira/browse/IGNITE-11335
Project: Ignite
Issue Type: Improvement
Reporter: Gabriel Jimenez
*Problem Statement:* When working with an ignite grid deployed across multiple
data centers, a functionality could not be identified that would guarantee no
unnecessary cross data center communication on read requests.
*Solution:* We decided to add filtering logic to GridCacheContext
selectAffinityNodeBalanced(...) dependent on an expected node attribute -
'DATA_CENTER' (no functional change if attribute not present). The logic
attempts to filter the incoming 'affNodes' parameter so that it includes only
nodes whose attribute value match the local node's attribute value, maintaining
the original nodes if none match.
Relevant Function:
https://github.com/apache/ignite/blob/ignite-2.6/modules/core/src/main/java/org/apache/ignite/internal/processors/cache/GridCacheContext.java#L2190
*Additional Questions:*
Was there an existing solution/approach to our '*Problem Statement'* that did
not involve changing the codebase?
Is there another preferred solution for our '*Problem Statement'*?
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