Add timestamp column with index to the partition stats table.
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Key: HIVE-2471
URL: https://issues.apache.org/jira/browse/HIVE-2471
Project: Hive
Issue Type: Improvement
Reporter: Kevin Wilfong
Assignee: Kevin Wilfong
Occasionally, when entries are added to the partition stats table the program
is halted before it can delete those entries, by an exception, keyboard
interrupt, etc. These build up to the point where the table gets very large,
and it hurts the performance of the update statement which is often called. In
order to fix this, I am adding a column to the table which is auto-populated
with the current timestamp. I am also adding an index on this column. This
will allow us to create scripts that go through periodically and clean out old
entries from the table. The index will help to keep the runtime of these
scripts short, and hence reduce the amount of time they need to lock the
table/indexes for.
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