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From "Yasuharu Goto (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-11425) Add prepared query parameter to trace for "Execute CQL3 prepared query" session
Date Tue, 29 Mar 2016 14:35:25 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-11425?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15216098#comment-15216098
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Yasuharu Goto commented on CASSANDRA-11425:
-------------------------------------------

[~thobbs] Thanks for your response!

I concern about the memory consumption too. I have no idea if we should trim queries to save
memory.
For a good memory management, I think we might have to add query string into EntryWeigher.weightOf()
calculation (and increase MAX_CACHE_PREPARED_MEMORY ?).

> Add prepared query parameter to trace for "Execute CQL3 prepared query" session
> -------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-11425
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-11425
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: CQL
>            Reporter: Yasuharu Goto
>            Assignee: Yasuharu Goto
>            Priority: Minor
>
> For now, the system_traces.sessions rows for "Execute CQL3 prepared query" do not show
us any information about the prepared query which is executed on the session. So we can't
see what query is the session executing.
> I think this makes performance tuning difficult on Cassandra.
> So, In this ticket, I'd like to add the prepared query parameter on Execute session trace
like this.
> {noformat}
> cqlsh:system_traces> select * from sessions ;
>  session_id                           | client    | command | coordinator | duration
| parameters                                                                             
                                                             | request                   
 | started_at
> --------------------------------------+-----------+---------+-------------+----------+------------------------------------------------------------------------------------------------------------------------------------------------------+-----------------------------+---------------------------------
>  a001ec00-f1c5-11e5-b14a-6fe1292cf9f1 | 127.0.0.1 |   QUERY |   127.0.0.1 |      666
|      {'consistency_level': 'ONE', 'page_size': '5000', 'query': 'SELECT * FROM test.test2
WHERE id=? LIMIT 1', 'serial_consistency_level': 'SERIAL'} | Execute CQL3 prepared query |
2016-03-24 13:38:00.000000+0000
>  a0019de0-f1c5-11e5-b14a-6fe1292cf9f1 | 127.0.0.1 |   QUERY |   127.0.0.1 |      109
|                                                                                        
    {'query': 'SELECT * FROM test.test2 WHERE id=? LIMIT 1'} |        Preparing CQL3 query
| 2016-03-24 13:37:59.998000+0000
>  a0014fc0-f1c5-11e5-b14a-6fe1292cf9f1 | 127.0.0.1 |   QUERY |   127.0.0.1 |      126
|                                                                                        
  {'query': 'INSERT INTO test.test2(id,value) VALUES (?,?)'} |        Preparing CQL3 query
| 2016-03-24 13:37:59.996000+0000
>  a0019de1-f1c5-11e5-b14a-6fe1292cf9f1 | 127.0.0.1 |   QUERY |   127.0.0.1 |      764
|      {'consistency_level': 'ONE', 'page_size': '5000', 'query': 'SELECT * FROM test.test2
WHERE id=? LIMIT 1', 'serial_consistency_level': 'SERIAL'} | Execute CQL3 prepared query |
2016-03-24 13:37:59.998000+0000
>  a00176d0-f1c5-11e5-b14a-6fe1292cf9f1 | 127.0.0.1 |   QUERY |   127.0.0.1 |      857
| {'consistency_level': 'QUORUM', 'page_size': '5000', 'query': 'INSERT INTO test.test2(id,value)
VALUES (?,?)', 'serial_consistency_level': 'SERIAL'} | Execute CQL3 prepared query | 2016-03-24
13:37:59.997000+0000
> {noformat}
> Now, "Execute CQL3 prepared query" session displays its query.
> I believe that this additional information would help operators a lot.



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