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Posted to dev@ambari.apache.org by "Siddharth Wagle (JIRA)" <ji...@apache.org> on 2015/05/21 22:31:17 UTC
[jira] [Created] (AMBARI-11317) Avoid Client side merge sort on
aggregator queries
Siddharth Wagle created AMBARI-11317:
----------------------------------------
Summary: Avoid Client side merge sort on aggregator queries
Key: AMBARI-11317
URL: https://issues.apache.org/jira/browse/AMBARI-11317
Project: Ambari
Issue Type: Task
Components: ambari-metrics
Affects Versions: 2.0.0
Reporter: Siddharth Wagle
Assignee: Siddharth Wagle
Fix For: 2.1.0
- Existing query plan:
{code}
0: jdbc:phoenix:localhost:61181:/hbase> explain select * from METRIC_RECORD WHERE SERVER_TIME > 1432139517000 AND SERVER_TIME < 1432149517000 ORDER BY METRIC_NAME, HOSTNAME, APP_ID, SERVER_TIME limit 5760;
+------------+
| PLAN |
+------------+
| CLIENT PARALLEL 2-WAY FULL SCAN OVER METRIC_RECORD |
| SERVER FILTER BY (SERVER_TIME > 1432139517000 AND SERVER_TIME < 1432149517000) |
| SERVER TOP 5760 ROWS SORTED BY [METRIC_NAME, HOSTNAME, APP_ID, SERVER_TIME] |
| CLIENT MERGE SORT |
+------------+
4 rows selected (0.061 seconds)
{code}
- Modified query plan.
{code}
0: jdbc:phoenix:localhost:61181:/hbase> explain select * from METRIC_RECORD WHERE SERVER_TIME > 1432139517000 AND SERVER_TIME < 1432149517000 ORDER BY METRIC_NAME, HOSTNAME, SERVER_TIME, APP_ID, INSTANCE_ID limit 5760;
+------------+
| PLAN |
+------------+
| CLIENT PARALLEL 1-WAY FULL SCAN OVER METRIC_RECORD |
| SERVER FILTER BY (SERVER_TIME > 1432139517000 AND SERVER_TIME < 1432149517000) |
| SERVER 5760 ROW LIMIT |
| CLIENT 5760 ROW LIMIT |
+------------+
4 rows selected (0.034 seconds)
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