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From "Kyle Roberts (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HAWQ-1560) Default LOG level for "data locality ratio:" events contribute to Hawq Master log bloat
Date Sat, 02 Dec 2017 00:58:00 GMT
Kyle Roberts created HAWQ-1560:
----------------------------------

             Summary: Default LOG level for "data locality ratio:" events contribute to Hawq
Master log bloat
                 Key: HAWQ-1560
                 URL: https://issues.apache.org/jira/browse/HAWQ-1560
             Project: Apache HAWQ
          Issue Type: Improvement
          Components: Resource Manager
            Reporter: Kyle Roberts
            Assignee: Yi Jin


Issue:  

Default LOG level for "data locality ratio:" events contribute to Hawq Master log bloat. 
Should only be needed when investigating/tuning performance.

Case Scenario:

"data locality ratio:" events can report multiple times and, depending upon the query, many
times.


Sample event:

2017-11-30 20:33:39.857251 GMT,"gpadmin","testdb",p280349,th-909919968,"[local]",,2017-11-30
20:06:35 GMT,1630750,con25419,cmd28,seg-1,,,,sx2,"LOG","00000","data locality ratio: 1.000;
virtual segment number: 1; different host number: 1; virtual segment number per host(avg/min/max):
(1/1/1); segment size(avg/min/max): (1016.000 B/1016 B/1016 B); segment size with penalty(avg/min/max):
(1016.000 B/1016 B/1016 B); continuity(avg/min/max): (1.000/1.000/1.000).",,,,,"SQL statement
""select count(*)::float4 from public.test_tbl as Ta where Ta.id is null""","analyze test_tbl;",0,,"cdbdatalocality.c",3372,


For example, Hawq master logs are seen with close to 20% of the file size is from only the
"data locality ratio:" events.

Product Enhancement suggestion: 

Because these are only needed for performance tuning (or for investigation):

In:

https://github.com/apache/incubator-hawq/blob/master/src/backend/cdb/cdbdatalocality.c#L3372

We can change default LOG level to something like DEBUG1, etc.



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