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From "Vladimir Ozerov (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (IGNITE-3933) JDBC issue with Replicated & Partitioned caches
Date Wed, 21 Jun 2017 11:08:00 GMT

     [ https://issues.apache.org/jira/browse/IGNITE-3933?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vladimir Ozerov updated IGNITE-3933:
------------------------------------
    Component/s:     (was: sql)
                 jdbc

> JDBC issue with Replicated & Partitioned caches
> -----------------------------------------------
>
>                 Key: IGNITE-3933
>                 URL: https://issues.apache.org/jira/browse/IGNITE-3933
>             Project: Ignite
>          Issue Type: Bug
>          Components: jdbc, odbc
>    Affects Versions: 1.8
>            Reporter: Igor Rudyak
>            Priority: Critical
>
> There is an issue with JDBC when trying to play with different types of caches using
the same JDBC connection.
> *Example 1 - using simple JDBC connection URL* jdbc:ignite:cfg://file:///my-ignite-client-config.xm
> 1) For *REPLICATED* caches SQL query like *select \* from my_replicated_cache* returns
as many duplicates for each record as many nodes in an Ignite cluster. Same problem with *select
count(\*) from my_replicated_cache* - it returns actual number of records multiplied by the
number of Ignite nodes.
> 2) At the same time if traversing the cache using "for" loop and iterator, it returns
exactly what's needed without any duplicates.
> *Example 2 - specifying replicated or partitioned cache in JDBC connection URL* jdbc:ignite:cfg://cache=my_cache@file:///my-ignite-client-config.xm
>  
> 1) If specifying *PARTITIONED* cache in JDBC URL - queries like *select * from my_replicated_cache*
return duplicates
>  
> 2) If specifying *REPLICATED* cache in JDBC URL - it doesn't return duplicates for the
*select * from my_replicated_cache* query. At the same time it failed to execute simple queries
like *select * from my_partitioned_cache* against *PARTITIONED* caches throwing this error:
> *java.lang.RuntimeException: javax.cache.CacheException: Queries running on replicated
cache should not contain JOINs with partitioned tables [rCache=product, pCache=order]*
> The fact that it's not possible to combine *REPLICATED* and *PARTITIONED* caches in one
SQL query (using one JDBC connection) looks not very good. 
> Also the idea of specifying cache name (for *REPLICATED* cache) in the JDBC URL for optimization
purposes doesn't look good. It's better to utilize rather wide used "hints" approach, to provide
optimization hints inside SQL query. Otherwise it's not possible to use JDBC with analytical
and UI tools to run ad-hock SQL queries.



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