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https://issues.apache.org/jira/browse/FLINK-16781?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bowen Li updated FLINK-16781:
-----------------------------
    Description: 
Currently there's no built-in cache mechanism for LookupableTableSource. 
Developers have one of the following options:

1) build their own cache

2) use external cache services, like redis, memcached, etc, which Flink 
unfortunately doesn't have an out-of-box lookup function either

3) give up caching and bear with poor lookup performance

 

Flink should provide a generic caching layer for all the LookupableTableSource 
to take advantage of.

 

cc [~ykt836] [~jark] [~lzljs3620320]

  was:
Currently there's no built-in cache mechanism for LookupableTableSource. 
Developers have to either build their own cache or give up caching and bear 
with poor lookup performance.

Flink should provide a generic caching layer for all the LookupableTableSource 
to take advantage of.

cc [~ykt836] [~jark] [~lzljs3620320]


> add built-in cache mechanism for LookupableTableSource in lookup join
> ---------------------------------------------------------------------
>
>                 Key: FLINK-16781
>                 URL: https://issues.apache.org/jira/browse/FLINK-16781
>             Project: Flink
>          Issue Type: Improvement
>          Components: Table SQL / API
>            Reporter: Bowen Li
>            Priority: Major
>
> Currently there's no built-in cache mechanism for LookupableTableSource. 
> Developers have one of the following options:
> 1) build their own cache
> 2) use external cache services, like redis, memcached, etc, which Flink 
> unfortunately doesn't have an out-of-box lookup function either
> 3) give up caching and bear with poor lookup performance
>  
> Flink should provide a generic caching layer for all the 
> LookupableTableSource to take advantage of.
>  
> cc [~ykt836] [~jark] [~lzljs3620320]



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