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https://issues.apache.org/jira/browse/PHOENIX-6127?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17225388#comment-17225388
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ASF GitHub Bot commented on PHOENIX-6127:
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richardantal commented on pull request #944:
URL: https://github.com/apache/phoenix/pull/944#issuecomment-720999062
I ran the tests locally, all of them were successful, but let's wait the
test result on the new version.
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> 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: 5.0.0, 4.15.0
> Reporter: Chinmay Kulkarni
> Assignee: Richard Antal
> Priority: Major
> Labels: phoenix-hardening, quality-improvement
> Fix For: 5.1.0, 4.16.0
>
> Attachments: PHOENIX-6127.master.v1.patch
>
>
> 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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