[jira] [Created] (KUDU-2802) The Java client tableExists should use GetTableSchema

["Grant Henke (JIRA)" <ji...@apache.org>]

Grant Henke created KUDU-2802:
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             Summary: The Java client tableExists should use GetTableSchema
                 Key: KUDU-2802
                 URL: https://issues.apache.org/jira/browse/KUDU-2802
             Project: Kudu
          Issue Type: Improvement
    Affects Versions: 1.9.0
            Reporter: Grant Henke


Currently the Java client `tableExists()` method uses a ListTables rpc. Instead it should use a GetTableSchema rpc. 

Based on a comment in this [review|https://gerrit.cloudera.org/#/c/13120/2/java/kudu-backup/src/main/scala/org/apache/kudu/backup/KuduBackup.scala@51] it could be especially important when authorization via Sentry is enabled:

{quote}
...tableExists() is a bad idea if Sentry integration is enabled. That's because tableExists() results in a ListTables RPC, and ListTables is going to perform really poorly with a cold Sentry cache: it'll send an RPC to Sentry for every table in the catalog. Coupled with the loop here (for each table being backed up) and it's bad news all around...
{quote}




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