[jira] [Created] (FLINK-33871) Reduce getTable call for hive client and optimize graph generation time

Mon, 18 Dec 2023 00:32:07 -0800 

hehuiyuan created FLINK-33871:
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             Summary: Reduce getTable call for hive client and optimize graph 
generation time
                 Key: FLINK-33871
                 URL: https://issues.apache.org/jira/browse/FLINK-33871
             Project: Flink
          Issue Type: Improvement
            Reporter: hehuiyuan


HiveCatalog.getHiveTable method wastes a lot of time when generate graph, 
because the number of calls  is relatively high.


I have an sql task with over 2000 rows,  the HiveCatalog.getHiveTable  method 
is called 4879 times , but only six hive tables were used. 

![image](https://github.com/apache/flink/assets/18002496/d5f0daf3-f80a-4790-ae21-4e75dff9cfd7)

The client.getTable method costs a lot of time.  

![image](https://github.com/apache/flink/assets/18002496/be0d176f-3915-4b92-a177-f1cfaf6d2927)
There is a statistic that jobmanager interacts with hive when generate graph.

If One call takes approximately 50 milliseconds ,
How much time it spends  : 4879 * 50 =243950ms  = 243.95s  = 4min

We can cache and  client.getTable method  is only  called six times.



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