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https://issues.apache.org/jira/browse/HIVE-2471?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Phabricator updated HIVE-2471:
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Attachment: HIVE-2471.D2367.1.patch
kevinwilfong requested code review of "HIVE-2471 [jira] Add timestamp column
with index to the partition stats table.".
Reviewers: JIRA
https://issues.apache.org/jira/browse/HIVE-2471
Added a timestamp column to the stats table. It defaults to the current
timestamp on inserts. I also updated the update query to update the timestamp,
since derby does not support the on update option as far as I can tell.
I modified the insert query to specify the columns it's inserting to. This
is not only necessary to prevent the query from inserting into the timestamp
column, it is safer in general.
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.
TEST PLAN
EMPTY
REVISION DETAIL
https://reviews.facebook.net/D2367
AFFECTED FILES
ql/src/java/org/apache/hadoop/hive/ql/stats/jdbc/JDBCStatsSetupConstants.java
ql/src/java/org/apache/hadoop/hive/ql/stats/jdbc/JDBCStatsUtils.java
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> Add timestamp column with index to the partition stats table.
> -------------------------------------------------------------
>
> Key: HIVE-2471
> URL: https://issues.apache.org/jira/browse/HIVE-2471
> Project: Hive
> Issue Type: Improvement
> Reporter: Kevin Wilfong
> Assignee: Kevin Wilfong
> Attachments: HIVE-2471.1.patch.txt, HIVE-2471.D2367.1.patch
>
>
> 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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