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https://issues.apache.org/jira/browse/PHOENIX-5502?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16942341#comment-16942341
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Geoffrey Jacoby commented on PHOENIX-5502:
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[~priyankporwal] - This appears to be by design (though I'm not sure I agree
with the design). See MetadataClient lines 4008-4023 in 4.14.3. It's
intentionally running a delete against the index first before doing the
rebuild. It appears to also be deactivating the index and putting it in
BUILDING state, so the end-user wouldn't notice a difference.
> ALTER INDEX REBUILD removes all rows from already valid/consistent index
> ------------------------------------------------------------------------
>
> Key: PHOENIX-5502
> URL: https://issues.apache.org/jira/browse/PHOENIX-5502
> Project: Phoenix
> Issue Type: Bug
> Affects Versions: 4.14.1, 4.14.2, 4.14.3
> Reporter: Priyank Porwal
> Priority: Major
> Fix For: 4.14.1, 4.14.2, 4.14.3
>
>
> Create Table & Indexes:
> CREATE TABLE DEMO2.PEOPLE (FNAME VARCHAR NOT NULL, LNAME VARCHAR, AGE
> TINYINT, ZIP INTEGER, CONSTRAINT pk PRIMARY KEY (FNAME, LNAME));
> CREATE INDEX PEOPLE_BY_ZIP ON DEMO2.PEOPLE(ZIP);
> CREATE INDEX PEOPLE_BY_AGE ON DEMO2.PEOPLE(AGE);
> Populate Data:
> UPSERT INTO DEMO2.PEOPLE VALUES ('Audi', 'Q5', 15, 65000);
> UPSERT INTO DEMO2.PEOPLE VALUES ('Volkswagon', 'Beetle', 10, 43130);
> UPSERT INTO DEMO2.PEOPLE VALUES ('BMW', 'X3', 4, 15030);
> Query Index:
> SELECT * FROM DEMO2.PEOPLE_BY_AGE;
> <3 rows show up>
> Rebuild Index:
> alter index people_by_age on DEMO2.people rebuild;
> Query Index Again:
> SELECT * FROM DEMO2.PEOPLE_BY_AGE;
> <No rows show up>
>
> It seems that if the index is already consistent, then the rebuild command
> removes all the index rows. Above is the simpler repro, but I have noticed
> similar behavior where rebuild command does the right thing first time on an
> inconsistent index (caused by truncation of table using hbase shell), but
> second run of rebuild command removes all the rows.
>
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