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From "James Taylor (JIRA)" <j...@apache.org>
Subject [jira] [Created] (PHOENIX-4092) Ensure index and table remains in sync when the table is mutating
Date Thu, 17 Aug 2017 02:14:00 GMT
James Taylor created PHOENIX-4092:
-------------------------------------

             Summary: Ensure index and table remains in sync when the table is mutating
                 Key: PHOENIX-4092
                 URL: https://issues.apache.org/jira/browse/PHOENIX-4092
             Project: Phoenix
          Issue Type: Bug
            Reporter: James Taylor


There's code in MetaDataClient.buildIndex() which runs a "catchup" query after the initial
index population finishes to find any rows for inflight writes made while the population is
taking place. This is meant to handle the case in which one client runs an UPSERT SELECT while
another issues a CREATE INDEX. Since the UPSERT SELECT began before the CREATE INDEX, index
maintenance will not be performed. The catchup query is meant to handle this scenario, though
it makes an assumption that it can wait long enough for any such DML operations to complete
prior to running the catchup query. Instead, we should have a mechanism to wait until all
inflight DML operations on a table are complete.

Note also that if an index is built asynchronously, there's no catchup query run at all.

We should increase the testing we have around this scenario and deal with these corner cases.
For one such test, see ImmutableIndexIT.testCreateIndexDuringUpsertSelect().



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