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Posted to issues-all@impala.apache.org by "Grant Henke (Jira)" <ji...@apache.org> on 2020/06/27 03:27:00 UTC

[jira] [Created] (IMPALA-9903) Queries on a Kudu table call openTable multiple times

Grant Henke created IMPALA-9903:
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             Summary: Queries on a Kudu table call openTable multiple times
                 Key: IMPALA-9903
                 URL: https://issues.apache.org/jira/browse/IMPALA-9903
             Project: IMPALA
          Issue Type: Improvement
          Components: Frontend
    Affects Versions: Impala 3.4.0
            Reporter: Grant Henke


When testing the results of KUDU-1802 I saw that each query ran would result in 5 GetTableSchema requests to the Kudu master server. The request comes from each KuduClient.openTable call in the Impala frontend. 
https://github.com/apache/impala/search?l=Java&q=openTable

Ideally Impala would only call KuduClient.openTable once and then use the returned KuduTable object for the length of the query. That would result in 5x fewer remote RPC calls to the Kudu master server per query.




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