[jira] [Created] (PHOENIX-6127) Prevent unnecessary HBase Admin API calls in ViewUtil.getSystemTableForChildLinks() and act lazily instead

["Chinmay Kulkarni (Jira)" <ji...@apache.org>]

Chinmay Kulkarni created PHOENIX-6127:
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             Summary: Prevent unnecessary HBase Admin API calls in ViewUtil.getSystemTableForChildLinks() and act lazily instead
                 Key: PHOENIX-6127
                 URL: https://issues.apache.org/jira/browse/PHOENIX-6127
             Project: Phoenix
          Issue Type: Improvement
    Affects Versions: 4.15.0, 5.0.0
            Reporter: Chinmay Kulkarni
             Fix For: 5.1.0, 4.16.0


In order to handle the case of older clients connecting to a 4.16 cluster that has old metadata (no SYSTEM.CHILD_LINK table yet), we call ViewUtil.getSystemTableForChildLinks() to figure out whether to use SYSTEM.CHILD_LINK or SYSTEM.CATALOG to look up parent->child linking rows.

Here we do HBase table existence checks using HBase admin APIs (see [this|https://github.com/apache/phoenix/blob/e3c7b4bdce2524eb4fd1e7eb0ccd3454fcca81ce/phoenix-core/src/main/java/org/apache/phoenix/util/ViewUtil.java#L265-L269]) which can be avoided. In almost all cases once we've called this API, we later go on and retrieve the Table object anyhow so we can instead try to always get the SYSTEM.CHILD_LINK table and if that fails, try to get SYSTEM.CATALOG. This will avoid additional admin API calls.



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