kuczoram opened a new pull request, #6721:
URL: https://github.com/apache/hive/pull/6721
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### What changes were proposed in this pull request?
Adding some indexes to the HMS backend tables to improve the performance of
the queries used by metrics collection and duplicate deletion.
The following
indexes are proposed to improve the performance of the query in
MetricsInfoHandler:
`CREATE INDEX TXNS_STATE_TYPE_ID_IDX ON TXNS (TXN_STATE,
TXN_TYPE, TXN_ID) ALGORITHM=INPLACE LOCK=NONE;
CREATE INDEX HL_ACQUIRED_AT_IDX
ON HIVE_LOCKS (HL_ACQUIRED_AT) ALGORITHM=INPLACE LOCK=NONE;
CREATE INDEX
CQ_STATE_COMMIT_TIME_IDX ON COMPACTION_QUEUE (CQ_STATE, CQ_COMMIT_TIME)
ALGORITHM=INPLACE LOCK=NONE;`
For the duplicate deletion from the COMPLETED_TXN_COMPONENTS table, I
propose to extend the existing index by adding the CTC_WRITEID and
CTC_UPDATE_DELETE columns as well.
### Why are the changes needed?
We faced some performance issues with these queries and trying to find a way
to improve them. I did some testing with and without the proposed indexes and
it can be seen that the indexes improve the performance of these queries.
Please find the numbers in the Jira description.
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
By unit tests and manually
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