[infinispan-issues] [JBoss JIRA] Created: (ISPN-200) Distributed queries

[Manik Surtani (JIRA)]

Distributed queries
-------------------

                 Key: ISPN-200
                 URL: https://jira.jboss.org/jira/browse/ISPN-200
             Project: Infinispan
          Issue Type: Feature Request
          Components: Distributed Cache, Querying
            Reporter: Manik Surtani
            Assignee: Manik Surtani
             Fix For: 5.1.0.BETA1, 5.1.0.GA


The holy grail of querying.  

* Indexes are _never_ shared.
   * Each node maintains local indexes for state it is responsible  
for (-Dinfinispan.query.indexLocalOnly=true).
   * Indexes could be in memory or disk.
* Queries themselves are distributed.
   * The query object is built and broadcast to the entire cluster.
   * Each node executes the query on its own _local_ index, returning  
results.
   * The calling node returns a CacheQuery impl that lazily fetches  
and collates results from the cluster.
   * I expect this Map/Reduce model to perform very well since the  
workload is split up and happens in parallel across multiple CPUs  
against much smaller (individual) datasets.
   * Works with all cache modes, including DIST.
   * Need to make sure duplicates are handled, as well as failover.


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