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From "Geoffrey Jacoby (Jira)" <j...@apache.org>
Subject [jira] [Created] (PHOENIX-5507) Local Index Rebuild Issues
Date Fri, 04 Oct 2019 20:38:00 GMT
Geoffrey Jacoby created PHOENIX-5507:
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             Summary: Local Index Rebuild Issues
                 Key: PHOENIX-5507
                 URL: https://issues.apache.org/jira/browse/PHOENIX-5507
             Project: Phoenix
          Issue Type: Bug
    Affects Versions: 4.14.3, 4.14.2, 4.15.0, 5.1.0
            Reporter: Geoffrey Jacoby


An umbrella for dealing with issues around rebuilding local indexes. 

While investigating PHOENIX-5502, a problem with synchronously rebuilding global indexes,
I realized that the rebuild functionality for local indexes seems to have several problems.
 # Same as PHOENIX-5502, synchronous local index rebuilds will run a delete against the old
index data, then rebuild. But the deletes will have server time of the rebuild, and the rebuilt
index rows should have the same timestamp as their original data, so the index data will be
hidden behind the deletes.
 # The IndexTool theoretically allows for doing rebuilds on local indexes, but it has a worrisome
check that prints a warning message if any split has taken place during the rebuild, saying
the rebuild has to be redone. We should probably disable splitting during the rebuild, but
then how to guarantee it gets re-enabled if the rebuilding client goes away?

So at the very least, a solution to the above two issues would have to be found to make local
index rebuild work. But it also suggests a larger question – given that local indexes have
stronger consistency guarantees than global, is "local index rebuild" actually a necessary
feature (vs a drop and rebuild if you somehow messed up a local index out-of-band.)?



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