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From Kyle Roberts <krobe...@pivotal.io>
Subject Re: Default LOG level for "data locality ratio:" events contribute to Hawq Master log bloat
Date Sat, 02 Dec 2017 01:53:38 GMT
Created JIRA: https://issues.apache.org/jira/browse/HAWQ-1560

Submitted pull request: https://github.com/apache/incubator-hawq/pull/1318

- Kyle



On Fri, Dec 1, 2017 at 4:47 PM, Kyle Roberts <kroberts@pivotal.io> wrote:

> Hi everyone,
>
> I will be creating a JIRA and submitting a pull request for this.
>
> Thanks,
>
> - Kyle
>
> On Thu, Nov 30, 2017 at 10:52 PM, 刘奎恩(局外) <kuien.lke@alibaba-inc.com>
> wrote:
>
>>
>> It makes sense to adjust its LOG level to reduce log size on master.
>> 1. It affects master performance if log file size is
>> huge.Query on hawq_toolkit.hawq_log_master_concise is slower
>>  as time going.
>> https://issues.apache.org/jira/projects/HAWQ/issues/HAWQ-1550
>> 2. It has little value when segments are seperated from storage nodes.If
>> storage nodes and computing nodes are geographically distributed,it is
>> common on Cloud service, and no distributed cache systems are
>> available,then we have little interest to keep them in log in such cases.
>>
>> data locality ratio
>> -------------——
>> Kuien Liu/奎恩
>> ------------------------------------------------------------------发件人:Kyle
>> Roberts <kroberts@pivotal.io>发送时间:2017年12月1日(星期五) 05:41收件人:dev
<
>> dev@hawq.incubator.apache.org>主 题:Default LOG level for "data locality
>> ratio:" events contribute to Hawq Master log bloat
>> 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): (1
>> 016.000 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/bac
>> kend/cdb/cdbdatalocality.c#L3372
>>
>>
>> Could we change default LOG level to something like DEBUG1, etc?
>>
>>
>>
>>
>> - Kyle
>>
>
>
>
> --
> Kyle Roberts  |  Staff Customer Engineer  |  650-846-1667
> <(650)%20846-1667>
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-- 
Kyle Roberts  |  Staff Customer Engineer  |  650-846-1667
Support.Pivotal.io
<http://www.google.com/url?q=http%3A%2F%2Fsupport.pivotal.io%2F&sa=D&sntz=1&usg=AFQjCNGDBr_XSKC18wot5h3OkKoZ84Vn7Q>
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